8 superior properties of silicon nitride

 

Silicon nitride ceramics is a synthetic material. The covalent bond between silicon atoms and nitrogen atoms in its structure is strong, so it has high strength, high hardness, corrosion resistance, oxidation resistance, abrasion resistance, and good resistance. Thermal shock and other characteristics are considered by the material industry as an engineering ceramic material with excellent comprehensive performance and applicable to high temperature fields.
Silicon nitride ceramics have good comprehensive properties and broad application prospects. For a long time, materials workers have been committed to developing the excellent properties of silicon nitride ceramics and continuously expanding their application fields. With the development of new technologies and the continuous deepening of theories, silicon nitride ceramics, as an engineering material with excellent performance, will surely get more rapid development and extensive applications.
1. The performance of silicon nitride
Silicon nitride ceramics have high fracture toughness and normal temperature strength. Even at high temperatures, their strength will not decrease much, and high temperature stability is good. Its main performance is as follows:
(1) Silicon nitride material has a low linear expansion coefficient, good thermal conductivity, and excellent thermal shock resistance;
(2) The hardness of silicon nitride is very large, 9~9.5, second only to a few superhard materials such as diamond and BN;
(3) The friction coefficient of silicon nitride is small, and it is self-lubricating and wear-resistant;
(4) Silicon nitride has good mechanical properties, hot-pressed and reaction sintered samples can obtain high bending strength, even up to Giga Pa. Its high temperature stability is good, it still has relatively high flexural strength at high temperature, and the high temperature creep is very small;
(5) Silicon nitride material has good insulating properties and is a good insulator material at high temperatures;
(6) The chemical properties of silicon nitride are very stable, it is not corroded by all inorganic acids except hydrofluoric acid, and it can exist stably in some alkalis;
(7) When silicon nitride ceramics are oxidized, a dense silicon dioxide film is easily formed on the surface, which prevents the continued oxidation. Its oxidation resistance temperature can reach 1400℃, and it can be used up to 1870℃ in reducing atmosphere.

(8) Silicon nitride is non-wetting with high-temperature metal solution and molten slag, and can be used as a high-temperature metal solution filter and an excellent corrosion-resistant material for molten slag.

Wanhao is a manufacturer who is specialized in designing various kinds of furnace and making refractory products for electric furnace, ladle, tundish, blast furnace, AOD furnace, IF furnace, etc.

Article Source:8 superior properties of silicon nitride

Company name ：Luoyang Wanhao New Material Co., Ltd.

More Refractory Products: http://www.wanhaorefractory.com/en/product.html

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