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2018年6月26日星期二

The difference between vacuum annealing furnace and vacuum quenching/tempering furnace

Vacuum heat treatment furnaces can be classified into vacuum quenching furnaces, vacuum tempering furnaces, vacuum annealing furnaces, etc. depending on the application. Choosing a vacuum furnace depends on the application and the performance of each component. This article simply introduces the difference and selection of vacuum quenching furnace, vacuum tempering furnace and vacuum annealing furnace.

1, vacuum quenching furnace;
Vacuum quenching furnace can be divided into vacuum oil quenching furnace and vacuum quenching furnace.

1) Vacuum oil quenching furnace is suitable for vacuum heat treatment of die steel, spring steel, stainless steel, bearing steel, high temperature alloy steel, etc.
Its main features are: wide range of applicable data, hardenability, low cost, quench oil can be used repeatedly.
The disadvantages are that the amount of deformation is relatively large, and the follow-up needs of the workpiece are clean.
Vacuum oil quenching furnace can be divided into two-chamber furnace and three-chamber furnace from the layout.

2) Vacuum high pressure gas quenching furnace is suitable for vacuum heat treatment of high-speed steel, stainless steel, die steel and some other hardenability materials. It is characterized by small deformation of parts and no need of cleaning after heat treatment. Inadequacies: Quenching gas cannot be recovered and the cost is high.

Vacuum high pressure gas quenching furnace can be divided into horizontal and vertical two kinds from the layout. Horizontal type can be divided into single room, double room and three rooms. Vertical heat treatment for ring-shaped, cylindrical and long rod-shaped parts. The high pressure gas quenching furnace vacuum quenching pressure is usually 2b a r ~ 10b a r. According to the user's needs can choose parts for the pressure of the furnace.

2, vacuum tempering furnace:
The vacuum tempering furnace can be divided into single chamber, double chamber and vertical type. Usually the nickel-chromium strip is used to heat the maximum temperature of 800°C. Vacuum tempering furnaces are generally suitable for parts with light appearance and no oxidation color after tempering.

3, vacuum annealing furnace:
Vacuum annealing furnace can be divided into single chamber, double chamber and vertical. Vacuum annealing furnace according to the part data can be selected in the high temperature and low temperature, (high temperature 800 °C ~ 1350 °C, low temperature 800 °C).

2018年6月21日星期四

Structural composition of vacuum annealing furnace

The Vacuum Annealing Furnace adopts the pre-vacuum atmosphere protection mode. When the operation is first pumped to a certain degree of vacuum, the furnace is filled with high-purity nitrogen or ammonia to decompose the atmosphere for protection and heating, so as to achieve less oxidation-free heating and no decarburization light. The purpose of the vacuum annealing furnace is therefore used for the quenching of stainless steel products.

Structure of the Vacuum Annealing Furnace.

1, furnace body
The shell is made of 4mm steel plate and reinforced steel. The inner lining is made of aluminum silicate fiber cotton or brick and stereotyped brick. The ring is evenly placed on the brick and placed on the brick.

2, furnace cover
The furnace cover is made of 25mm steel plate, and the lower part of the furnace cover is provided with an insulating layer structure.

3, vacuum nitrogen filling pipeline
A vacuum pressure gauge is installed on the furnace cover for pipes and valves used for vacuum and nitrogen filling (plug-and-play type), and pressure safety protection device is also provided.

4, furnace tank
The tank is made of stainless steel. The bottom of the tank is welded with stiffeners. The top of the tank is equipped with a cooling water jacket, sand sealing device, and fastening bolts.

5, heating elements
Optional 0Cr25Al5, 0Cr27Al7Mo2 or Cr20Ni80 alloy wire around.

6, sealing device
The furnace lid and furnace tank are sealed with inner and outer double-layer composite structure. The inner layer is made of graphite asbestos and the outer layer is made of silicone rubber with oil resistance and temperature resistance. In order to maintain the service life of the sealing device, a water cooling device is specially provided.

7, water cooling device
By the upper and lower sets of two, respectively welded on the lid and furnace flange flange, used to protect the sealing material.



2018年6月13日星期三

Vacuum Annealing Furnace application in annealing of titanium alloys

Titanium has metallic luster and ductility. Density 4.5 g/cm3, Melting point 1660±10°C, Boiling point 3287°C. The main features of titanium are low density, high mechanical strength, and easy processing. The plasticity of titanium depends mainly on purity. The purer the titanium, the greater the plasticity. It has good corrosion resistance and is not affected by the atmosphere and seawater. At room temperature, it will not be corroded by dilute hydrochloric acid, dilute sulfuric acid, nitric acid or dilute alkali solution; only hydrofluoric acid, hot concentrated hydrochloric acid, concentrated sulfuric acid, etc. can borke it.

In recent years, rare metal pipes, especially titanium pipes, zirconium pipes, etc., have been widely used in aerospace, marine, nuclear power, petrochemical and other fields, and these industries have extremely high requirements on the quality of pipes.

Vacuum annealing is an important process for the production of intermediate and finished products. There are many ways to heat the annealing process, but annealing the titanium tube using vacuum annealing is a relatively new technology and process in the rare metal processing field.

The Vacuum Annealing Furnace frame is welded by various types of steel. The outer frame is made of channel steel as the main beam, the hoarding is made of cold thin plate, the channel steel is used as the main beam, and the bottom plate and front and rear end plates are made of midplane.

Transmission part: The trolley drive adopts motor and reducer to drive the front set of driving wheel drive through the chain. The door-to-door drive uses a combination of a worm gear reducer and a motor to electrically lift.
Sealing: The labyrinth structure is adopted for the seal between the trolley and the furnace body, and an automatic sand-sealing knife sealing device is arranged on the trolley side. The door seal adopts the roller type compression and the spring compression automatic mechanism to seal the furnace body. The furnace body part adopts the high quality refractory brick structure to ensure the sealing of the furnace. In the pressure part of the trolley, a high-alumina brick building is used, and the lower part is filled with thermal insulation bricks.
Combustion system: Several burning nozzles are installed on both sides of the oil furnace, and the heat flow circulates in the furnace to ensure the uniformity of the furnace temperature. Automatic and semi-automatic types can be selected as required.
Exhaust gas preheating device: A smoke exhaust preheating device is installed at the upper end of the furnace. When the flue gas in the furnace passes through the preheater, it is sent to the cold air for preheating by the fan, and then sent to the burning nozzle for combustion by the pipeline. Install a manual disc valve at the outlet, which regulates the pressure in the furnace.

2018年6月7日星期四

How to choose an energy-saving vacuum annealing furnace?

I. Choose high quality vacuum annealing furnace lining material

The furnace lining adopts aluminum silicate and ceramic fiber, which has the advantages of compact structure, small volume, light weight, good heat insulation, small heat storage loss, fast heating and cooling speed, less heat loss from the furnace body, and energy saving. The fiber cotton is compressed into a square folding bag and is fixed on the furnace top and wall of the annealing furnace with stainless steel riveting hardware. The riveting hardware is hidden in the folding bag and the heat is not transmitted to the furnace wall through the riveting firmware.

II. To strengthen the vacuum annealing furnace door, trolley and furnace body seal, greatly reducing the heat loss.

The upper and lower sides of the furnace door are along the guide rails on both sides. The upper end of the guide rail is fixed on the cross beam of the door frame, and the lower end is connected with two electric push rods. Fiber-cotton blankets are attached around the door and the furnace panel, and the electric push rod tensions the guide rails. The rail presses the furnace door so that the furnace door is in close contact with the furnace panel without any gap. The trolley adopts a soft seal structure of a fire-resistant fiber blanket pressed by an electric push rod, so that a tightly sealed requirement is achieved between the trolley and the furnace body, and heat loss is greatly reduced.

III. Control vacuum annealing furnace furnace pressure

The furnace pressure is generally controlled in the range of 100Pa. Micro differential pressure sensors are used to generate digital signals and meters. In-furnace pressure can be displayed. The high pressure in the furnace can increase the speed of the flue gas draft fan and increase the opening of the flue electric valve, and vice versa. This control can be done automatically or manually.

IV. Pulse Annealing Furnace

As the flame of the burner is blown out at its exit at a very high speed, a strong stirring effect is generated in the furnace, so that the temperature inside the furnace is always kept uniform, and at the same time, 10 burners in the furnace are controlled by the PLC in an orderly manner from the small fire. Changing the fire, so that the furnace temperature is even and save energy, the temperature of the various parts of the furnace and the combustion of each burner, at a glance on the computer's main screen.

V. The vacuum annealing furnace adopts the air-fuel ratio valve to automatically control the ratio of gas to air so that the gas can be fully burned, energy can be saved, and pollutant gas emissions can be reduced.

VI. Selection of vacuum annealing furnace flue outlet After the furnace, the well is built with a refractory brick wall in front of the flue to reduce the discharge of heat in the furnace.

VII. Use flue gas heat. Preheat the 4200m/h combustion air to about 350°C, and the annealing furnace can save energy by 20%.

2018年5月31日星期四

Classification and translations of the Vacuum Annealing Furnace

There are two main classifications of vacuum annealing furnaces, including horizontal vacuum annealing furnaces and well-type vacuum annealing furnaces.

Horizontal Vacuum Annealing Furnace is mainly used for vacuum annealing of special materials, stainless steel, selenium steel core, precious metal parts, silver copper composite rivets and sheets.

Horizontal Vacuum Annealing Furnace Features:
1. Horizontal Vacuum Annealing Furnace is specially used for annealing of small parts and other under vacuum conditions;
2. The tightness of the Horizontal Vacuum Annealing Furnace is good, which effectively avoids the surface oxidation and rust of the workpiece in the annealing treatment and improves the quality of the treatment.
3. The holding furnace body can be moved backwards. After the annealing is completed, the cooling rate can be increased while maintaining the vacuum state.

Well-type Vacuum Annealing Furnace adopts pre-vacuum gas protection mode. During operation, the Well-type Vacuum Annealing Furnace is first pumped to a certain degree of vacuum, and the Well-type Vacuum Annealing Furnace is filled with high-purity nitrogen or ammonia decomposition gas for protection and heating, so as to achieve less non-oxidation heating, no off The purpose of carbon bright. Due to the use of agitating fans, the Well-type Vacuum Annealing Furnace has a higher uniformity of the furnace temperature. The Well-type Vacuum Annealing Furnace is mainly used for non-oxidized bright annealing of mechanical parts, silicon steel sheets, copper materials, copper, and wire materials.

Well-type Vacuum Annealing Furnace Features:
1, the heating element is distributed within the furnace, the distribution is reasonable
2. The furnace cover can be equipped with a hot air circulation device to make the gas and temperature in the furnace tank uniform;
3, can be equipped with vacuum pumping, increase ventilation speed, gas is more pure;
4, there is a protective gas, the product after annealing, no oxidation, eliminate processing stress, improve magnetic properties of iron core, reduce iron loss;
5, furnace temperature control using PID automatic power control smooth temperature control.

2018年5月21日星期一

The main purpose of vacuum annealing furnace

Vacuum Annealing Furnace mainly applied to stainless steel deep drawing parts such as plumbing equipment, water expansion parts, pins, medical equipment, stainless steel nails, stainless steel wire, rivets, stainless steel bearings, case, strap, cutter, micro shaft, self-tapping self drilling, Cutlery and other stainless steel products under the control of the protective atmosphere continuous bright annealing, solid solution, demagnetization and quenching of stainless steel multi-purpose furnace.



After Vacuum Annealing Furnace treatment, the surface of the product is smooth, non-oxidizing and non-decarburizing. Vacuum Annealing Furnace has the advantages of high production efficiency, low energy consumption, less pollution, convenient operation, low labor intensity, etc. Vacuum Annealing Furnace can also be used for brazing and sintering of metal materials. Department of the introduction of foreign advanced digestion of the most advanced products in early 90.

Vacuum Annealing Furnace is widely used in the laboratory and manufacture of the field of metallurgy, ceramics, machinery, analysis test, semiconductor, chemical industry, metallurgy, and glass industries, new material developing, machinery, fire-proof material, architecture, special material and etc under vacuum or other gases condition. Also our Vacuum Furnace can be used in the fields of science & research and so on.

2018年5月17日星期四

Muffle Furnace - The best Muffle Kiln from Luwei Muffle Furnaces.

Description of Muffle Furnace
A muffle furnace (sometimes retort furnace in historical usage) is a furnace in which the subject material is isolated from the fuel and all of the products of combustion, including gases and flying ash.[1] After the development of high-temperature electric heating elements and widespread electrification in developed countries, new muffle furnaces quickly moved to electric designs.

Today, a muffle furnace is usually a front-loading box or tube design used for high-temperature applications such as melting glass, creating enamel coatings, technical ceramics or soldering and brazing. They are also used in many research facilities to determine what proportion of a sample is non-combustible and non-volatile (i.e. ash).



Features of Muffle Furnace
Different inner chamber materials with different temperature. Temperature range from 1000°C - 1800°C. Muffle Furnace is High purity alumina fiber insulation and Morgan materials brick PID automatic control via SCR (Silicon Controlled Rectifier) power control with phase angle fired current limiting resistor. 16 programmable segments for precise control of heating rate.

2018年5月14日星期一

Gold Melting Furnace - The best Gold Melting Kiln from Luwei Gold Melting Furnaces.

Description of Gold Melting Furnace
Gold Melting Furnace is High purity alumina fiber insulation and Morgan materials brickPID automatic control via SCR (Silicon Controlled Rectifier) power control with phase angle fired current limiting resistor.16 programmable segments for precise control of heating rate. Different inner chamber materials with different temperature. Temperature range from 1000°C - 1800°C.

Induction Melting is widely used for Gold Melting, Silver Melting and Copper melting. These induction gold melting systems are used in any realm of gold melting from High and Low Production Mining facilities to Precious Metals Refining entities to precious metals wholesale and retail buyers looking to melt their metals for more accurate assays.



Features of Gold Melting Furnace
Gold Melting Furnace is used to melt gold in order to refine gold prior making ornaments. Melting gold helps separating gold from black sand, dust, rags and other unwanted materials present. This gold furnace heats gold at its melting point. In addition, it is also used to melt silver. Gold Melting Furnace is one of useful instruments for jewelry makers and available in various capacities depending upon their use.

2018年5月10日星期四

Glass Melting Furnace - The best Crucible Melting Furnace from Luwei Melting Furnaces.

Description of Glass Melting Furnace
Glass Melting Furnaces for melting and fritting are widely used in glass manufacturing due to their excellent temperature range, flexible configurations, and ease of access. As these are predominately batch furnaces in a box furnace configuration they can be specified as either bottom loading or front loading, but in the process of glass melting, access is highly facilitated.

The Glass Melting Furnaces product are used as day container. SiC rod heating in the furnace roof provide for fast heating times. A robust chamber insulation of refractory bricks in the bottom and non-classified fiber in the roof allows efficient working with low power consumption. The melting furnace is the appliance in a hot glass studio that holds the molten glass that will be gathered or ladled out to make glass products.



Features of Glass Melting Furnace
Glass Melting Furnace is a one-of-a-kind. With our advanced controller your furnace will follow your temperature curve. And, at the same time, controls the glass melting process evenly in every part of the furnace. We supply Glass Melting Furnaces to glass blowers and medium sized businesses. We design and manufacture the furnaces to your specific needs.

2018年5月9日星期三

Calcined with Medium High Temperature Treatment Brown Fused Alumina

The Calcined with Medium High Temperature Treatment Brown Fused Alumina is calcined at a high temperature of 1050°C during the production process of the raw brown corundum, and then subjected to a bonfire treatment.

The Calcined with Medium High Temperature Treatment Brown Fused Alumina has the characteristics of very small expansion coefficient, excellent hydrophilicity, high toughness, and high strength, etc. The sintered abrasive tool produced has the characteristics of dark blue, no mesh crack, and no rust spot after firing. Improve the precision and grinding effect of grinding tools, especially for the production of high-grade fixed abrasive tools.

The advantages of Calcined Brown Fused Alumina in Medium Temperature
The medium-temperature calcined Brown Fused Alumina has the characteristics of very small expansion coefficient, excellent hydrophilicity, high toughness, and high strength, etc. The sintered abrasive tool produced has the characteristics of dark blue, no mesh crack, and no rust spot after firing. Improve the precision and grinding effect of grinding tools, especially for the production of high-grade fixed abrasive tools.



Why choose us?
1, high-quality grinding grade alumina
Workers hand-picked high-quality ground-grade alumina for smelting, with Al2O3 content as high as 85%, ensuring quality from the source!

2, secondary refining
All Brown Fused Alumina plus secondary refining for 3 hours outside the industry standard smelting time improves product quality!

3, strict classification
The smelted brown corundum blocks are graded manually by workers to ensure that each batch is a quality product!

4, high-strength magnetic separator
The industry is generally 2 5000 Gaussian magnetic separator, we use 5 13,000 Gaussian magnetic separator to remove ferrosilicon impurities!

5. Corporate strength
The company has operated more than 10 years and the factory has invested over 100 million yuan. Choose us equal to choose quality!

2018年5月7日星期一

Crucible Furnace - The best Crucible Kilns from Luwei Crucible Furnaces.

Description of Crucible Furnace
Crucible Furnaces are one of the oldest and simplest types of melting furnace unit used in the foundry. The Crucible Furnaces uses a refractory crucible which contains the metal charge. The charge is heated via conduction of heat through the walls of the crucible. The heating fuel is typically coke, oil, gas or electricity. Crucible Furnaces are typically classified according to the method of removing the metal from the crucible.

Crucible Furnace is designed for easy maintenance and convenient operation. The efficient design allows for dependability and durability. Insulation aids in heating uniformity for precise, uniform temperature control which is required for today’s high-temperature processes. This unit automatically sets the PID values for your thermal process.



Features of Crucible Furnace
Electric Laboratory Glass Melting Crucible Furnace is mainly used in the high temperature fusion of block and powder materials to obtain a variety of new formulas and new materials for the performance test of new materials.

Calcined with High Temperature Treatment Brown Fused Alumina

High Temperature Calcined Treatment Brown Fused Alumina is calcined at the high temperature, and with the anneal treatment. Calcined with High Temperature Treatment Brown Fused Alumina is characterized by very low coefficient of linear expansion, very good hydrophilicity, good toughness and high hardness, producing the sintered grinding tools that is characterized by deep blue color after firing, without resillage, without rust and so on. So our this kind of product increase the precision and grinding ablity of the grinding tools in the using course.

The High-Temperature Calcined Brown Corundum is formed by high-temperature calcination of medium-temperature calcined abrasive during the production process of the original brown corundum, followed by high temperature calcination followed by bonfire treatment.

The main characteristics of High Temperature Calcined Treatment Brown Fused Alumina inclued this kind of Brown Fused Alumina is very small expansion coefficient, excellent hydrophilicity, great toughness, and high strength. The sintered abrasives produced have the characteristics of dark blue after burning, no network cracks and no rust. As a result, the accuracy and grinding effect of the grinding tools are improved, especially for the production of high-grade fixed abrasive tools.

2018年5月3日星期四

Brown Fused Alumina by Barmac Crushing

Brown Fused Alumina is made of bauxite and coke (anthracite) as the main raw material, and is produced by high-temperature smelting in an electric arc furnace. Grinding tools made of it are suitable for grinding metals with high tensile resistance, such as various common steel materials. , malleable cast iron, hard bronze, etc., can also be made of advanced refractory materials.

Brown Fused Alumina by Barmac Crushing is processed through Barmac production line. It has the characteristics of high bulk density, high purity, dense texture, strong self-sharpening, good toughness, and extremely low magnetic material content. Sharp cutting, low heat generation rate, high grinding ratio, and less adhesion during use, the sintered abrasive tool has the characteristics of dark blue, no mesh cracks, and no rust spots after firing. After washing, the dust is reduced to Lowest, suitable for the manufacture of ceramics, resin high-consolidated abrasives and grinding, polishing, etc.

Brown Fused Alumina by Barmac Crushing Process: it is made of artificially selected brown corundum blocks and processed by means of rollers, ball mills, barmac, etc. The grain size is used by F8-F325. It is mainly used for polishing, grinding, industrial grinding, etc. The customer requires the processing of water washing, pickling and other methods to meet the different needs of customers.

Brown Fused Alumina by Barmac Crushing Specifications: After pre-furnace and special process re-treatment, reduce the residual carbon content of brown corundum so that the product does not powder, burst, toughness is the first choice for the abrasive abrasive industry, refractory industry raw material.

Brown Fused Alumina by Barmac Crushing Use: mainly used for ceramic abrasives, high-grade abrasives, organic abrasives, abrasive belts, coated abrasives and so on.

Brown Fused Alumina by Barmac Crushing Features: according to the residual carbon content is divided into: calcined corundum C ≤ 0.05%, low-carbon corundum C ≤ 0.10%, ordinary brown corundum C ≤ 0.15%. The common name is also known as corundum, which is a brown fused alumina produced by melting and reducing alumina, carbon, and iron scraps in an electric furnace.

2018年5月2日星期三

Continuous Heating Furnace - The best Heating Kilns from Luwei Continuous Heating Furnaces

Description of Continuous Heating Furnace

Continuous Heating Furnaces are the right choice for processes with fixed cycle times such as drying or preheating, curing, aging, vulcanisation or degassing. The Continuous Heating Furnaces are available for various temperatures up to a maximum of 1400 °C. The Continuous Heating Furnace design depends on the required throughput, the process requirements for heat treatment and the required cycle time.

Continuous heat treating furnaces are efficient at treating large volumes of parts under the same conditions for a given time. Because changing variables such as times, temperatures and atmosphere can be difficult and expensive with continuous heat treating furnaces, they excel especially in situations where a large number of similar components require similar treatment.



Features of Continuous Heating Furnace

Roller Hearth Furnaces are designed to heat treat a wide variety of products economically with uniform, repeatable results. There’s a wide range of sizes of electric or fuel-fired heating systems with matched cooling sections and material handling systems. A Continuous Furnace is one whose conveyor runs at a constant speed, where the work is fed to match emerges in the desired condition.

Continuous Heating Furnaces are conveyed through preheatingcalcinating and cooling zones on rotating rollers and are placed on selters according to the shape and dimensions. Continuous Heating Furnaces are heated uniformly by the upper and lower heaters (electric resistance wiressilicon carbide(SIC) or silicon molybdenum rods(MoSi2)).Continuous Heating Furnace

Brown Fused Alumina by Ball Milling

The abrasive grains of Brown fused alumina ball milling is crashed by ball mill machine. The bulk density is lower than the Baramc grains. Brown fused alumina by ball milling is characterized by its high purity, strong self-sharpening, good toughness, ultra-low content of the magnetic materials. Brown Fused Alumina by Ball Milling can be made into grinding tools that is characterized by sharp grinding, low heat generation ratio, high grinding rate and few coating in the using course, and the sintering grinding tools that is cahracterized by deep blue color after firing, with out resillage,rust and so on.

Brown fused alumina ball milling is processed through a ball mill production line. Its packing density is lower than that of Bamak sand. The characteristics of Brown fused alumina ball milling are high purity, strong self-sharpening, good toughness, and extremely low magnetic material content. The grinding tool has sharp grinding, low heat generation rate, high grinding ratio, and less adhesion during use.

Brown fused alumina ball milling made of sintered abrasive has the characteristics of dark blue, no mesh crack and no rust after firing. After washing, the dust is extremely low. Brown fused alumina ball milling is suitable for the production of high-consolidation ceramics and resin abrasives, as well as grinding and polishing and so on.

2018年4月27日星期五

Introduction of Fused Cast AZS Brick

The Fused Cast AZS Bricks consists of eutectoids and glassy phases of corundum and zirconium aragonite. From the phase theory, it is the eutectoid of the corundum and zirconium phases, and the glass phase is filled between their crystals.

The Fused Cast AZS Bricks, also known as fused zirconia corundum brick, is AZS. It is based on the three chemical components of the Al2O3-Zr02-Sio2 ternary phase diagram, arranged in order of their contents, Al2O3 takes A, Zr02 takes Z, Sio2 take S, the national standard uses this abbreviation, such as No. 33 cast zirconia corundum brick, abbreviated as AZS-33 #, 36 cast zirconia corundum brick, abbreviated as AZS-36 #, 41 cast zirconia corundum brick, abbreviated AZS- 41#.



The Fused Cast AZS Bricks manufacturing process combines the selected zircon sand and industrial alumina powder in a 1:1 ratio, plus a small amount of NaZO (added as sodium carbonate), B20: (added as boric acid or borax) flux, mixed Uniform, after being melted at 1900~2000°C and casted, Zr0233% fused cast bricks can be obtained. On this basis, using partially desiliconized zircon sand as raw material, 36%~41% fused cast bricks containing ZrO2 can be obtained.

Fused zirconia corundum brick is mainly used in the glass industrial tank furnace, glass electric furnace, steel industry slides, brewing alkali industry furnaces and other high temperature resistant erosion resistant kiln refractory materials.

2018年4月26日星期四

Tempering Furnace - The best Tempering Kilns from Luwei Tempering Furnaces.

Description of Tempering Furnace

Tempering is a process of heat treating, which is used to increase the toughness of iron-based alloys. Tempering is usually performed after hardening, to reduce some of the excess hardness, and is done by heating the metal to some temperature below the critical point for a certain period of time, then allowing it to cool in still air.

Tempering Furnaces are batch type units equipped with recirculating fan(s) and gas-fired or electric heating systems. Tempering Furnaces are designed for tempering or stress relieving in air, nitrogen, argon or hydrogen atmospheres. Tempering Furnaces are used for a variety of heat treating applications including those requiring inert atmospheres.



Features of Tempering Furnace

Tempering Furnaces for both low and high tempering processes. These Tempering Furnaces provide a reliable platform for acquiring various mechanical properties during tempering and reduce the residual stresses during the stress relieving process.

2018年4月25日星期三

Brown Fused Alumina by roller crushing

Brown Fused Alumina by roller crushing is processed through the processing of the roller production line, and the bulk density is lower than the ball-milled sand, but the purity is high, the self-sharpness is strong, the toughness is good, the magnetic substance content is extremely low, and the abrasive grinding tool made of the same is used. Sharp cutting, low heat generation rate, high grinding ratio, and less adhesion during use, the sintered abrasive tool has the characteristics of considerable dark blue after burning, no network cracks, and no rust. Applicable to the manufacture of ceramics, resin, high-abrasive abrasives, and grinding, polishing and so on.

Brown Fused Alumina by roller crushing has high purity, high self-sharpness, good toughness, and extremely low magnetic material content. Grinding tools made from Brown Fused Alumina by roller crushing have sharp grinding, low heat generation rate, high grinding ratio, and less adhesion when used; Density is lower than ball-milled plastic sand, but it has high purity, strong self-sharpness and good toughness.



Why Choose Yu Shi Brown Fused Alumina by roller crushing?

1, high-quality grinding grade alumina
Workers hand-picked high-quality ground-grade alumina for smelting, with Al2O3 content as high as 85%, ensuring quality from the source!

2, secondary refining:
All brown corundum plus secondary refining for 3 hours outside the industry standard smelting time improves product quality!

3, strict classification
The brown corundum blocks after smelting are screened and graded by workers manually to ensure that each batch is a quality product!

4, high-strength magnetic separator
The industry is generally 2 5000 Gaussian magnetic separator, we use 5 13,000 Gaussian magnetic separator to remove ferrosilicon impurities!

5. Corporate strength
The company has operated more than 20 years and the factory has invested over 100 million yuan. Choose us equal to choose quality!

2018年4月23日星期一

Brown Fused Alumina P Grains

Brown Fused Alumina for coated abrasives is produced under well water-washing and carefully sieving again on the basis of FEPA Standard. The smelting method of brown corundum P grains is divided into two types: fixed type (separation furnace) and dumping type. The smelting method of brown fused alumina has better texture and energy saving.



Brown Fused Alumina P Grains is the kind of non-calcined Brown Fused Alumina Oxide grain for coated abrasives application, the Brown Fused Alumina P Grains shape is very sharp, high abrasive ability and good self-sharpening. Brown Fused Alumina P Grains is used for producing all kinds of coated abrasives products, such as sand paper, cloth, belts, and so on.

Brown Fused Alumina P Grains is based on the standard of Brown Fused Alumina F Grains, and processed by further separating and washing process. This brown corundum P sand is not calcined at high temperatures and has a sharp shape, high grinding capacity and good self-sharpening properties.

2018年4月22日星期日

Vacuum Hardening Furnace - The best Vacuum Hardening Kilns from Luwei Vacuum Hardening Furnace.

Description of Vacuum Hardening Furnace

With the rich industry experience and knowledge, we are able to manufacture and supply a wide range of Vacuum Hardening Furnaces. The offered Vacuum Hardening Furnaces are made by using high quality material in compliance with all the national and international quality standards and norms and are durable in nature and sturdily constructed.

Hardening is a typical heat treatment process combining heating to specific temperatures (mostly above 900 °C) and direct fast cooling or quenching of the part. The requirements are selected to change the materials’ structure partially or completely into martensite.



Features of Vacuum Hardening Furnace

Vacuum Hardening Furnace can be used on determination, metallographic laboratory for analysis, research, or industrial and mining enterprises for hig and metal work in the air for normalizing, annealing, hardening, for the Laboratory for universities, scientific research and environmental protection unit.

2018年4月19日星期四

Vacuum Heat Treatment Furnace - The best Vacuum Heat Treatment Kilns from Luwei Vacuum Furnace.

Description of Vacuum Heat Treatment Furnace

A vacuum furnace is a type of furnace in which the product in the furnace is surrounded by a vacuum during processing. The absence of air or other gases prevents oxidation, heat loss from the product through convection, and removes a source of contamination.

Vacuum Technology is the Basis for Process Innovation in Heat Treatment. Vacuum Heat Treatment Furnace is the process in which metallic/steel parts are exposed completely or partially to time-temperature sequences in order to change the mechanical and/or corrosion properties. Modern, precise, energy efficient and ecological vacuum heat treatment equipment with guaranteed technology.



Features of Vacuum Heat Treatment Furnace

Vacuum Heat Treatment Furnace 1700°C can be used for numerous purposes because they apply vacuum as well as inert atmospheres. This main application is debinding and subsequent sintering of ceramics or powder metallurgical parts.

2018年4月18日星期三

Tilting Furnace Brown Fused Alumina

In order to meet the demands of the refractory industry, we independently develop and produce the Tilting Furnace Brown Fused Alumina which is adopted by modern unique technology of smelting and processing under the universities and research institutes' support.

Tilting Furnace Brown Fused Alumina is characterized by high purity, good crystal, strong fluidity, low coefficient of linear expansion, good corrosion-resistance and so on. After practical tests by dozens of refractory manufacturers. Tilting Furnace Brown Fused Alumina can't burst, pulverise and craze in using course. In particular, Tilting Furnace Brown Fused Alumina performance-cost ratio is much higher than traditional Brown Fused Alumina, and Tilting Furnace Brown Fused Alumina become the best aggregate and padding of Brown Fused Alumina refractory materials.

2018年4月17日星期二

Annealing Furnace - The best Annealing Oven from Luwei Annealing Furnaces.

Description of Annealing Furnace
Annealing Furnace is a process used in semiconductor device fabrication which consist of heating multiple semiconductor wafers in order to affect their electrical properties. Heat treatments are designed for different effects. Annealing Furnaces may be integrated into other furnace processing steps, such as oxidations, or may be processed on their own. Furnace anneals are performed by equipment especially built to heat semiconductor wafers. Furnaces are capable of processing lots of wafers at a time but each process can last between several hours and a day.



Annealing Furance designs can be stationary, moving or continous, are a few examples. Annealing is applied to both ferrous and non-ferrous metals, and is intended to reduce the strength and hardness of the product while increasing the ductility. Annealing Furnace features heating elements in ceramic fibre insulation, providing a maximum temperature of 1100°C in the furnace’s vacuum tight chamber.

Features of Annealing Furnace
An Annealing Furnace is a piece of equipment used to heat a material at very high temperatures, to change its hardness and strength properties. Annealing is commonly associated with the manufacture of steel, to relieve internal stresses that may lead to failure in service and to produce a more uniform, or homogeneous, internal structure. 1200°C degree 1600°C degree metal or ceramics heat treatment furnace Annealing Furnace is welded by steel and profiled steel; furnace chamber is ceramic fiber and high quality electric resistance wire/SiC heaters, which can save 40% energy than brick furnace chamber. Car Bottom Furnace is mainly used for annealing, normalizing and stress relieving of bars and tubes, forgings, large weldments and castings.

Brown Fused Alumina Sandblasting

Brown Fused Alumina is fused in the electric-arc furnace under the high temperature of above 2250°C with high quality abrasive bauxite as raw material and matched by the carbon material and scrap iron. The degree of refractory is more than 1850°C.

Sand blasting is an operation method that uses compressed air to spray brown corundum sand through the blasting equipment at a high speed to the surface of the workpiece to be processed to increase its roughness, thereby enhancing the adhesion between the workpiece and the paint.

Brown Fused Alumina for Sandblasting is mainly used for various material workpieces to decontaminate, derusting, prevent corroslon, remove oxide skin, light-decorate, process pattern effect and so on. About Brown Fused Alumina for Sandblasting there are three factors the decide the effect of Brown Fused Alumina for sandblasting:
1. The grinding ability: the higher grinding ability, the better for sandblasting.
2. The bulk density: the higher bulk density, the better for sandblasting.
3. The dust: the lower dust, the better for sandblasting.

Brown fused alumina sandblasting features high grinding force, high bulk density and low dust. Brown Fused Alumina with high bulk density and air cleaned, the quality of this kind of Brown Fused Alumina is very excellent for sandblasting.

2018年4月12日星期四

Brown Fused Alumina High/Middle Bulk Density Air Cleaned Grains

Brown Fused Alumina is made of high-quality bauxite as raw material, anthracite and iron filings. It is made by arc smelting at 2000°C or higher temperature. It is crushed and plasticized by self-grinding machine, magnetically deferred to iron, sieved into various sizes, and its texture is dense and hard. High, spherical pellets, suitable for the production of ceramic, high-resistance abrasive resin and grinding, polishing, sandblasting, precision casting, etc., can also be used to manufacture high-grade refractories.

There are two ways to improve product cleanliness:
The first is to use high-power dry cleaning machines to clean F54 crude products. The machine consists of a blower and an induced draft fan. When the material enters the dry-cleaning machine, the blower is adjusted to the proper air volume to allow the material to jump up and down in the machine room, and the fine dust in the product is separated from the wood chips in the material by friction and collision between the materials; The rear induced draft fan introduces dust and wood chips with relatively light material and relatively small particles into the dust removal equipment. The cleanliness reaches over 98%.



Second, the adjustment of dry-cleaning equipment is mainly used to produce products with less than F60. Because F60 is a fine-grained product, air heating is used to eliminate static electricity and moisture to ensure the quality of dry-clean abrasive products.



The use of Brown Fused Alumina:
1. Sandblasting - abrasive medium hardness, high packing density, no free silica, a large specific gravity, good toughness, widely used in aluminum, copper profile glass, washed denim precision molds and other fields;

2. Free grinding - Grinding grade abrasives, used in kinescopes, optical glass, monocrystalline silicon, lenses, watches with glass, crystal glass, jade and other fields;

3. Resin Abrasives - Suitable for abrasives, good hardness, toughness, suitable particle cross-section type and edge retention, applied to resin abrasives, ideal results;

4. Coated Abrasives - Abrasives are raw materials for sandpaper, gauze and other manufacturers;

5. Functional fillers - mainly used for automotive brake parts, special tires, special construction products and other collar can be used as construction of highway pavement, airstrips, piers, parking lots, industrial floors, sports grounds and other wear-resistant materials;

6. Filter media - is a new type of abrasive applications, the use of granular abrasive as the bottom media of the filter bed, purification of drinking water or wastewater, is a new type of water filter material at home and abroad, especially for non-ferrous metal processing;

7.Hydraulic cutting——It is a new type, environmental protection and safe cutting method that uses abrasive as cutting medium and high-pressure hydraulic jets for basic cutting. It is applied to the cutting of petroleum (natural gas) pipelines, steel and other parts.

2018年4月11日星期三

Sintering Furnace - The best Sintering Oven from Luwei Sintering Kiln Manufacturer.

Description of Sintering Furnace
Sintering is the process of compacting and forming a solid mass of material by heat or pressure without melting it to the point of liquefaction. Sintering happens naturally in mineral deposits or as a manufacturing process used with metals, ceramics, plastics, and other materials. Luwei Furnace Company designs and builds Sintering Furnaces around our clients’ manufacturing needs – the time, temperature and atmosphere requirements for their specific product manufacturing process.

Sintering Furnaces is mainly for laboratory industrial and mining enterprises scientific research units for element analysis, and measured small size steel hardening, annealing, tempering of heat treatment for heatingfurnaces. Sintering Kilns can also be used as a metalceramic sintering dissolution and analysis of high heating use.



Features of Sintering Furnace
Sintering Furnaces is High purity alumina fiber insulation and Morgan materials brick PID automatic control via SCR (Silicon Controlled Rectifier), power control with phase angle fired current limiting resistor and 16 programmable segments for precise control of heating rate.

2018年4月10日星期二

Vice White Fused Alumina

Vice White Fused Alumina is developed on the basis of brown fused alumina smelting. The Vice White Fused Alumina can substitute compact Fused Alumina to make tapping launder castable refractory.

Vice White Fused Alumina can also substitute white fused alumina and tabular Alumina to make sliding plate, corundum bricks and abrasion-resistant castable etc. All of which have achieved the same effectiveness compare with usingcompact fused alumina and white fused alumina.



Vice White Fused Alumina has the hardness of White Fused Alumina, and it also has the toughness of brown corundum. It is used to replace the iron grate castable made from dense corundum, as well as the skateboards, corundum bricks, wear-resistant castables, etc. that are made by replacing white corundum and plate corundum. Acquire and use dense corundum, white corundum and other equivalent effects.

The Vice White Fused Alumina Segment sand, and Vice White Fused Alumina Powder have the characteristics of no bursting, no chalking, large stacking, and good fluidity during use, and can be widely used to produce a variety of shaped refractory products and corundum casting materials and other amorphous bulk materials and light fired corundum refractory products.

2018年4月8日星期日

Ceramic Roller Kilns - The best Ceramic Roller Kiln from Luwei Ceramic Roller Furnace.

Description of Ceramic Roller Kilns
Ceramic Roller Kilns for fast firing of wall and floor tiles have been used for nearly 25 years. In this type of kiln the products to be fired are transported through the kiln by means of rotating ceramic rollers. Ceramic Roller Kilns is manufactured using optimum grade raw material and sophisticated technology in synchronization with international standards. In order to ensure quality, the entire range is rigorously tested on various parameters by our quality controllers.



The Ceramic Roller Kilns offers the manufacturer a fuel efficient solution where cycles are fast and products require a very tight temperature uniformity. For special technical applications, Nutec Bickley have provided roller hearth kilns as an alternative to shuttle or tunnel kilns. Ceramics rollers are supplied in different materials (mullite or silicon carbide) depending on the application requirements.

Features of Ceramic Roller Kilns
The Ceramic Roller Kilns is mainly used in the production of ceramic tiles table dishware bone teaset pottery bowls ceramic gifts and other ceramic building materials. Ceramic Roller Kiln is continuous heating and work it is made by the rotation of the ceramic tube as the roller kiln vehicle the ceramic tiles or bricks materials in the kiln inner chamber. The rotation of the ceramic tube with high temperature(high-alumina)or SiC depending on the calcination temperature and ar driven by independent controller.

2018年4月7日星期六

Brown Fused Alumina Micro Powder

Brown Fused Alumina is made of high-quality bauxite as the main raw material, and it is made into various particle size products by adopting processing methods such as purification, impurity removal, crystallization, sorting, crushing, magnetic separation, and sieving in the high temperature above 2200°C of the arc smelting furnace.

Brown Fused Alumina Powder is made of natural bauxite as raw material, carbon (mainly coke) as reducing agent, and iron scrap is added as settling agent (clarifier) ​​to form ferrosilicon at the bottom of electric furnace.



Brown Fused Alumina Micro Powder is tan, generally Al2O3 ≥ 94.5%, SiO2 ≤ 3.5%, TiO2 ≤ 3.5%, Fe2O3 ≤ 1%. The mineral composition is dominated by α-Al2O3. The central part of the crystal shape is diamond-shaped, thick plate-shaped, and cracked particles. There are more silicon oxide and calcium oxide in the periphery and melt crystallize, showing a long plate shape and the most coarse grains. Slit platelets.

Since the impurities have not been completely removed, the brown fused alumina also contains secondary phases such as calcium hexaaluminate, calcium plagioclase, spinel, rutile, and glass phases, ferroalloys, and solid solutions. The color of Brown Fused Alumina depends to a large extent on the titanium oxide remaining in the product.

Brown Fused Alumina Micro Powder performance include High hardness, high strength, impact resistance, high temperature resistance, oxidation resistance, corrosion resistance, low creep, etc.

Brown Fused Alumina is mainly used as abrasive. In recent years, it has been used as the raw material for large and medium-sized blast furnace cast iron hook castables and cast iron aggregates and for the production of common corundum bricks (including high-alumina silicon carbide casts).

Brown Fused Alumina Micro Powder is suitable for making bonded and coated abrasive tools, wet or dry blasting, superprecision grinding and polishing, making high quality refractory materials, grinding carbon steel, alloy steel, malleable cast iron, hard bronze and semi-conductor materials.

2018年4月4日星期三

The role of Fused Cast AZS Bricks in Glass Furnaces

For a glass kiln, Fused Cast AZS Bricks effect in galss furnace is very important, in order to achieve the design life or to avoid contamination of the glass solution, a thorough understanding of the appearance quality and intrinsic quality of the fused cast bricks is required. we need to understand the performance of the fused cast azs bricks and the weak points of the fused cast bricks.



First, the appearance quality of Fused Cast AZS Bricks in Glass Furnaces, the pool wall part of the corner brick, kiln chopped brick, bubbling bricks, liquid flow brick is generally fused cast azs 41#. With the neighboring brick assembly gap to be strict requirements, the gap assembly to speed up the glass solution on the brick erosion, assembly The gap requirement is not more than 0.5mm. It is advisable that there is no shrinkage hole at the bottom of the brick. More than twelve per cubic meter of surface air holes above the ¢2mm are not allowed. The color of the brick body is yellowish and white, bubbling, and liquid flow bricks are not allowed. The presence of cracks does not allow the presence of flaws within 300 mm of the top of the pool wall section.

Second, the intrinsic quality of Fused Cast AZS Bricks in Glass Furnaces.
1. From the brick color to determine the impurities in the fused cast brick, or to determine whether the carbon content is large, the color of the large carbon brick will be green, this brick is strictly prohibited.
2. While a massive greening on the surface of the brick body, there must be iron blocks inside. The iron blocks come from the flat material in the production process or the iron and solder part of the exhaust gas falls off, and other factors. This imagined brick is also prohibited.
3. The glass phase contrast must be strictly controlled. When the glass phase exceeds the standard, the large amount of glass phase precipitated at high temperatures can reduce the service life of the furnace and contaminate the glass melt.

2018年4月2日星期一

Brown Fused Alumina Melt Film Precision Casting Sand

Brown fused alumina melt film precision casting sand is the latest corundum products self-developed by Yushi Company to meet the market demands. Based on the production of the brown fused alumina and with special technology, Brown fused alumina melt film precision casting sand is produced by the careful organization of the researchers.

The quality of Brown fused alumina melt film precision casting sand has reached the advanced level of similar foreign products through laboratory tests and production in practice of dozens of casting enterprises. And some performances of Brown fused alumina melt film precision casting sand can be adjusted or showcased according to the customers' requirement.

The Brown fused alumina melt film precision casting sand has high refractoriness, low thermal expansion coefficient, good thermal stability, strong air permeability and high intensity, easy to shell, high casting finish. It can substitute Zirconia sand (powder) its price is only half of zirconia sand (powder), and the recovery ratio is high as well.

Brown fused alumina melt film precision casting sand can be mainly applied to the melt films and silicasol technology of jewelry, handicrafts, stainless steel products, watches, glasses, aluminum die casting industries, and can be processed in line with the demands of the clients.



2018年4月1日星期日

Pusher Kilns - The best Pusher kiln from Luwei Ceramic Pusher kilns.

Description of Pusher Kilns
Pusher Kilns and tunnel kilns are ideal for processes requiring precise control of temperature and atmosphere, for those with longer residence times that require exact control of the heat up rate of the product (temperature profile), and those with a lower gas/solid reaction.



The Pusher Kiln has a hydraulic system that pushes load trays (ceramic or metal) through the kiln tunnel. The trays may push through various zones of temperature to meet a particular temperature profile. For larger load sizes, more than one tray may be pushed in at a time. When the trays reach the exit end of the kiln, they may be manually or automatically returned to the entrance end for reloading. As in the Car Kiln, the entire process can be automated to be safer and more efficient.

Features of Pusher Kilns
Pusher Kilns is mainly used in the production of ceramic tiles table dishware bone teaset pottery bowls ceramic gifts and other ceramic building materials. Pusher Kiln is continuous heating and work it is made by the rotation of the ceramic tube as the roller kiln vehicle the ceramic tiles or bricks materials in the kiln inner chamber.

2018年3月29日星期四

Selection of Fused Zirconium Corundum Bricks in Furnaces

In recent years, with the digestion and absorption of imported technologies, the technical progress of kiln furnaces has continuously increased the quality requirements of tilt-casting fused zirconia corundum bricks, and the usage has been continuously expanded. As a manufacturing factory, the production technology of inclined cast bricks has been updated and improved, making the product quality a relatively large step, basically reaching the international advanced level of similar products.



The demand for non-shrinkable fused zirconia corundum bricks has been increasing in recent years, with the exception that 41# fused zirconia corundum bricks are almost completely free of shrinkage casting, and oxidizing method 33# is not required for crater-free fused zirconia corundum bricks. There has also been a considerable increase in usage. The production cost of this product is high and the production process is more complicated, so the selling price of the product is higher. In recent years there have also been glass melting furnaces using dense-end cast bricks, which are used in the pool wall area.

The basic principles for the rational selection of fused zirconia corundum bricks:
(1) The wall bricks in contact with the glass melt are oxidized with a 33 # tilted cast zirconia corundum brick. This choice is technically and economically reasonable.
(2) Almost all of the upper structure of the melting furnace can be normally fused cast zirconia corundum bricks, and its function is fully enough.
(3) For the furnace with kiln bottom insulation, the 75mm-thick oxidizing method with 33# non-shrinkage AZS bricks is most suitable for the kiln floor surface, and it is used in combination with the zirconium corundum ramming material.
(4) The side walls, flat borings and inclined rakes of small furnaces are generally made of 33 # zirconia corundum bricks with common casting reduction method, and the bottom of the furnace can also be made of 33 # zirconia corundum bricks without shrinkage or dense casting.
(5) The wall of the clarification department is preferably made of ordinary cast α-β alumina bricks, and the kiln bottom is preferably made of α-β alumina bricks without shrinkage casting. The cost of such selected furnaces is higher and can also be used. Oxidation method 33 # AZS brick instead.



2018年3月28日星期三

Green Silicon Carbide - The best Silicon Carbide Black from China YuShi

Green Silicon Carbide (SiC) is an extremely hard (Mohs 9.4 / 2600 Knoop) man made mineral that possesses high thermal conductivity and high strength at elevated temperatures (at 1000°C, SiC is 7.5 times stronger than Al2O3).

Green SiC is made from Silica sand and coke, and is extremely pure. Hexagonally shaped, it breaks into very sharp particles. Green SiC is harder than black, coming in at a 9.4 Mohs and 2600 on the Knoop scale.



Green Silicon Carbide is produced in electrical internal resistance furnaces from very high purity silica sand and petroleum coke.

Description of Green Silicon Carbide

Green silicon carbide is produced as the same type as the black silicon carbide, except the different raw materials. Its crystallization has higher purity and hardness.



Green silicon carbide is suitable for processing hard alloy, metallic and non-metallic materials with hard and brittle feature such as copper, brass, aluminum, magnesium, jewel, optical glass, ceramics etc. Super micropower of it is also a kind of ceramics material.