Let's talk about the raw materials and properties of corundum crucible?
The crucible is a bowl shaped container with a deep ceramic bottom. To heat solids with fire, use a crucible. Because it is more resistant to temperature than glass. When using the crucible cover, the crucible cover is usually tilted on the crucible to prevent it from being washed away by hot air and allow air to enter and leave freely, so that oxidation reaction may occur. Because the bottom of the crucible is small, it is generally necessary to directly heat the mud triangle with fire. On the iron tripod, the crucible can be placed as required or as required by the experiment. When heated, the crucible cannot be placed on the cold metal table to reduce cracking.
The main raw material of fused corundum crucible is crystalline graphite. Therefore, the inherent physical and chemical properties of graphite materials are maintained. That is, it has good thermal conductivity and heat resistance. When working at high temperature, it has small coefficient of thermal expansion and strong resistance to rapid heating and cooling. In acidic and alkaline solutions, it has strong corrosion resistance and good chemical stability. When using crucibles of various models and specifications, they are not limited by the production scale, batch size and smelting material type. They can be selected at will, have stronger adaptability and achieve the purity of the materials used.
When feeding, do not squeeze too tightly to avoid thermal expansion of the metal and cracking of the crucible.
The shape of corundum crucible meets the requirements, reduces local stress and shortens service life.
Considering the service life of corundum crucible, the strong oxidation flame should be reduced to the crucible to shorten the service life of crucible raw materials. Graphite crucibles are used in metallurgy, casting, machinery, chemical industry and other industrial sectors for the smelting of alloy tool steel and non-ferrous metals and their alloys. It has good technical and economic benefits. There are three kinds of raw materials produced by crucible method. One is crystalline graphite, the other is plastic refractory clay, and the third is calcined high hardness kaolin skeleton clinker. In recent years, high temperature resistant synthetic materials such as silicon carbide, aluminum Emery and ferrosilicon have been used as clinker for crucible framework. Improve the quality, density and strength of crucible products.
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