Structural ceramics have superior strength, hardness, insulation, heat conduction 坣壱屲, high temperature resistance, corrosion resistance, wear resistance, wear resistance and other characteristics, so in a very harsh environment or engineering application conditions, the high stability and excellent mechanical function of the material industry has attracted much attention, then what are the classification and characteristics of structural ceramics?
1. Alumina ceramics Alumina ceramics is a very promising high-temperature structural ceramics 坣壱屲, its melting point is very high, can be used as refractory materials, such as crucible, high temperature furnace, etc., the use of alumina hardness advantages, can be made in the laboratory to use corundum grinding machine, used to grind materials with less hardness than it.
2. Silicon nitride ceramics Silicon nitride ceramics is also a very important structural ceramics, it is a kind of superhard material 坣壱屲, low density, itself has lubricity, and wear resistance, in addition to hydrofluoric acid, he does not react with other inorganic acids, corrosion resistance, high temperature energy oxidation resistance.
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3. Boron nitride ceramics, boron carbide ceramics Boron nitride ceramics is an industrial material, it is a kind of 60,000 crystal system 坣壱屲, with a scaly structure, its appearance like ivory, boron nitride ceramics is developed with the development of aerospace and electronics industry, has a wide range of uses in industrial ceramics.
4. The main components of rubies and sapphires are AI203(corundum). 坣壱屲 the red color of rubies is due to a small amount of compounds containing Ming, and the color of sapphires is due to a small amount of compounds containing titanium.