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Refractory materials used in optical glass manufacturing

In recent years, due to the development of the optical glass industry, the optical glass of the new variety is continuously increasing, and the refractories of the optical glass are also developed correspondingly. In addition to the earliest use of clay, kaolin, bauxite and other natural raw materials to create refractory material. There are pure oxide refractory products. Such as fused silica products, fused corundum products and sintered mullite and other refractory materials. For some new varieties of optical glass melting also used tin dioxide ceramics, platinum, platinum alloys, carbon materials as smelting optical glass high temperature container, the development of new varieties of optical glass and increase the amount of optical glass have played a A certain role in promoting.

In the optical glass melting process, in order to use the crucible method and pool furnace melting method is more common. Crucible type more. Pool melting method with the main furnace using a variety of special shaped or special cast refractories. Although such materials have a complex manufacturing process but a wide variety and high resistance to glass erosion and high temperature mechanical strength, these materials provide the advantages of selective use for melting various glass varieties. Refractories include:

1. Melting optical glass crucibles and mixers

Aluminosilicate materials: clay kaolin crucible and stirrer, high aluminum lining material, SiOAI203 ~ SiO2: system of synthetic materials.

Quartz material: transparent and opaque fused quartz, quartz ceramic crucible. Corundum material: recrystallization sintering crucible, titanium corundum crucible and mixer.

Tin dioxide material: tin dioxide crucible carbon material: pyrolytic carbon crucible, glassy carbon crucible.

2. Optical glass pool furnace material

Fused quartz brick. Casting refractory materials, which include mullite, Cuomalaite, corundum oblique zircon, mouth corundum, Lu Hong, jade corundum and other fused brick.

In the aluminosilicate refractories, as a relatively old clay-kaolin refractories, due to a certain degree of high temperature, corrosion resistance, and the manufacturing process is simple, the advantages of low prices. So in the optical glass industry still occupies a very important position. Therefore, the research on the raw material properties, chemical mineral composition and manufacturing process of such refractories remains a focus of attention.