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Silicon nitride Inorganic substance Si3N4 has the chemical formula. It is a ceramic material of high wear resistance, lubricity and hardness. The atomic crystal silicon nitride resists oxidation when heated to high temperatures.
It is a synthetic ceramic. Because the covalent bonds between silicon atoms, and nitrogen atoms, in its structure, are strong, it has high strength.

Silicon Nitride: Properties

Normal temperature strength and high fracture toughness are characteristics of silicon nitride. They will maintain their strength at high temperatures. The properties of the material are:

(1) Silicon Nitride material is low in linear expansion, has good thermal conductivity and thermal shock resistance,
(2) The hardness level of silicon nitride, at 99.5, is the second highest in the world, only behind diamond and BN.
This material is lubricant and wear resistant, with a small friction coefficient.
(4) Silicon nitride exhibits good mechanical properties.
(5) Silicon nitride has excellent insulation properties at high temperatures;
It can also exist in some alkalis; It can be found in some alkalis.
When silicon nitride materials are oxidized a dense layer of silicon dioxide is formed easily on the surface. The film prevents continued oxidation. Its oxidation resist temperature can reach 1400. In reducing atmosphere, it can also be used to up to 1870.
Silicon nitride has a non-wetting property with high-temperature metallic solution and molten steel slag. This makes it an excellent corrosion-resistant molten steel slag material.

Material industry views silicon nitride ceramic as an excellent engineering material. It can be used for high temperature fields.

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