An Important Structural Ceramic Material Silicon Nitride Powder

Silicon nitride powder is an inorganic substance with the chemical formula Si3N4. It is an important structural ceramic material with high hardness, inherent lubricity, and wear resistance.

Silicon Nitride Properties:

Silicon nitride powder is gray, white or off-white. It is a high-temperature insoluble compound, has no melting point, and has strong resistance to high-temperature creep. The load softening point of reactive sintered silicon nitride without a binder is above 1800degC; silicon nitride is a hexagonal crystal system.
Silicon nitride has two crystal structures of a and b, both of which are hexagonal crystals. Its decomposition temperature is 1800degC in air and 1850degC in 110MPa nitrogen. Si3N4 powder has low thermal expansion coefficient and high thermal conductivity, so it has excellent thermal shock resistance.

Except for hydrofluoric acid and hot phosphoric acid, silicon nitride does not react with other inorganic acids and has strong corrosion resistance.

Silicon Nitride Application:

Silicon nitride ceramics have excellent characteristics, and people often use it to make bearings, turbine blades, mechanical seal rings, permanent molds and other mechanical components. If silicon nitride ceramics, which are resistant to high temperatures and difficult to transfer heat, are used to make the heating surfaces of engine components, not only can the quality of the engine be improved, fuel savings, and thermal efficiency can be improved.

Silicon nitride is used as a high-grade refractory material. For example, SI3N4-SIC refractory is used in blast furnace body and other parts in cooperation with sic; when it is used in combination with BN as SI3N4-BN material, it is used in horizontal continuous casting separation ring. SI3N4-BN series horizontal continuous casting separation ring is a fine-structure ceramic material with uniform structure and high mechanical strength.

Silicon nitride ceramic materials can be used for high-temperature engineering components, advanced refractory materials in metallurgical industry, anti-corrosion components and sealing components in chemical industry, tools and cutting tools in machining industry, etc.

In addition, silicon nitride can also be used in solar cells, and silicon nitride is used in ultra-high temperature gas turbines, aircraft engines, electric furnaces, etc.

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