Silicon nitride powder

The basic characteristics of silicon nitride powder

Silicon nitride is a kind of high hardness, stable structure, low thermal expansion coefficient, oxidation resistance and erosion resistance is very good set of excellent thermal and chemical properties of advanced ceramic materials.A noble material production of silicon nitride ceramic powder with high purity, high nitrogen content, narrow particle size distribution, high sintering activity, stable chemical composition, decomposition, resistance to high temperature oxidation resistance, especially the high temperature strength, high hardness, good wear resistance, good thermal, force of impact, and has self lubricating effect, its form a fine dispersion phase in the composites,Thus, the comprehensive properties of the composites are greatly improved.

High mechanical strength, hardness close to corundum, self lubrication, wear resistance.The room temperature bending strength can be as high as 980MPa, compared with alloy steel, and the strength can be maintained to 1200℃ without decreasing.

Good thermal stability, thermal expansion coefficient is small, has good thermal conductivity, so thermal shock resistance is very good, from room temperature to 1000℃ thermal shock will not crack.

Chemical stability, almost all inorganic acid (except HF) and concentration of 30% below caustic soda (NaOH) solution corrosion, but also can withstand a lot of organic matter erosion, a variety of non-ferrous metal melt (especially aluminum) not wet, can withstand strong radiation irradiation.

Low density, small specific gravity, only 2/5 of steel, good electrical insulation.

Main uses of silicon nitride powder:

In the metallurgical industry made crucible, muffle furnace furnace, combustion nozzle, heating fixture, mold, liquid aluminum conduit, thermocouple temperature protection sleeve, aluminum electrolytic cell lining and other thermal equipment components.

In the machinery industry into high-speed turning tools, bearings, metal parts heat treatment support, rotor engine blade, gas turbine guide blades and turbine blades, etc.

In the chemical industry, ball valves, pump bodies, sealing rings, filters, heat exchanger parts, immobilized catalyst carriers, combustion boats, evaporating dishes, etc.

In semiconductor, aviation, atomic energy and other industries used to manufacture switching circuit substrates, film capacitors, electrical insulators subjected to high temperature or temperature change, radome, missile tail nozzle, atomic reactor support and isolation parts, carrier of nuclear fission materials, etc.

In medical engineering, artificial joints can be made.

In silicon nitride ceramic engine instead of the same type of metal engine.