| Name | Silicon nitride powder |
| Molecular formula | Si3N4 |
| Color | White-gray |
| Melting point | 1900℃ |
| Thermal conductivity | 25W/m.K |
| Specific heat | 800J/Kg.℃ |
| Dielectric constant | 8.3@1Hz |
| Molecular weight | 140.3 |
| Moh's hardness | 9 |
| Product advantages： | |
| Basic characteristics of silicon nitride powder: ●Silicon nitride is an advanced ceramic material that has excellent thermal and chemical properties with high hardness, stable structure, low coefficient of thermal expansion, excellent oxidation and corrosion resistance. The silicon nitride ceramic powder produced has high purity, high nitrogen content, narrow particle size distribution, high sintering activity, stable chemical composition, decomposition resistance, high-temperature oxidation resistance, especially high-temperature strength, high hardness, good wear resistance, and It has good thermal and mechanical impact and self-lubricating effect. It forms a finely dispersed phase in the composite material, thereby greatly improving the comprehensive performance of the composite material. ●High mechanical strength; hardness close to corundum; self-lubricating; wear-resistant. The room temperature flexural strength can be as high as 980MPa, which can be compared with alloy steel, and the strength can be maintained up to 1200℃ without decreasing. ●Good thermal stability; small thermal expansion coefficient; good thermal conductivity. So thermal shock resistance is very good, which will not crack from room temperature to 1000 ℃ thermal shock. ●The chemical performance is stable, and it is resistant to almost all inorganic acids (except HF) and caustic soda (NaOH) solutions with a concentration of less than 30%. It is also resistant to the corrosion of many organic substances. It is not resistant to a variety of non-ferrous metal melts (especially molten aluminum). And it can withstand strong radiation exposure. ●Low density; small specific gravity; only 2/5 of steel; excellent electrical insulation. |
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| Application | |
| The main use of silicon nitride powder: ●Silicon nitride based on ceramic-grade material, which is mainly used to make high-performance silicon nitride-ceramic structural parts, silicon nitride ceramic balls, silicon nitride targets, etc.; ●Silicon nitride-based on photovoltaic-grade material with a purity of over 99.99%, can be used for crucible coating (release agent) for polysilicon ingots, high-performance nitride phosphors, and other fields; ●It can be made into components on thermal equipment such as crucibles, muffle furnace chambers, burners, heating element fixtures, casting molds, aluminum liquid conduits, thermocouple temperature measurement protection sleeves, and aluminum electrolytic cell linings in the metallurgical industry. ●It can be made into high-speed turning tools, bearings, supports for heat treatment of metal parts, rotor blades, gas turbine guide blades and turbine blades in the machinery industry. ●It can be made into all valves, pump bodies, sealing rings, filters, heat exchanger parts, fixed catalyst carriers, combustion boats, evaporating dishes, etc. in the chemical industry. ●In the semiconductor, aviation, atomic energy and other industries, it is used to manufacture switching circuit substrates, film capacitors, electrical insulators that withstand high temperatures or sudden temperature changes, radomes, missile nozzles, supports and separators in atomic reactors, and nuclear fission Substance carrier, etc. ●In medical engineering, it can be made into artificial joints. ●Using an all-ceramic engine made of silicon nitride material to replace the metal engine of the same type. |
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