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Performance Characteristics of Silicon Nitride Ceramic Materials

wallpapers Industry 2020-10-10
Silicon nitride is an important structural ceramic material. It is a super-hard substance, which has lubricity and is wear-resistant. It is an atomic crystal; it is resistant to oxidation at high temperatures. Moreover, it can resist the impact of cold and heat. It will not be broken if it is heated to more than 1000℃ in the air, cooled rapidly and then heated rapidly. It is precisely because of the excellent characteristics of silicon nitride ceramic that people often use it to manufacture mechanical components such as bearings, gas turbine blades, mechanical seal rings, permanent moulds and so on. 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 diesel engine be improved, fuel savings and thermal efficiency can be improved. My country, the United States, Japan and other countries have developed such diesel engines.
The process of preparing silicon nitride ceramic products generally consists of raw material processing, powder synthesis, powder processing, forming, green processing, sintering and ceramic body processing.
The initial application of silicon nitride ceramics was mainly used in machinery, metallurgy, chemical, aviation, semiconductor and other industries, as parts of specific equipment or products, and achieved good expected results. In recent years, with the development of manufacturing process and test analysis technology, the reliability of silicon nitride ceramic products has been continuously improved, so the application range has been continuously expanded. Particularly worthy of appreciation is that silicon nitride ceramic engines are being developed and significant progress has been made, which has become a significant event in science and technology.
1. In the metallurgical industry, it is used to make parts on thermal equipment such as crucibles, muffle furnaces, burners, heating element fixtures, casting moulds, aluminium liquid conduits, thermocouple temperature measurement protection sleeves, and aluminium electrolytic cell linings.
2. In the machinery industry, it can be used to make high-speed turning tools, bearings, supports for the heat treatment of metal parts, rotor blades, gas turbine guide blades and turbine blades.
3. In the chemical industry, it is made into ball valves, pump bodies, sealing rings, filters, heat exchanger parts, fixed catalyst carriers, combustion boats, evaporating dishes, etc.
4. Used in the semiconductor, aviation, atomic energy and other industries to manufacture switching circuit substrates, film capacitors, electrical insulators that withstand high temperatures or sudden changes in temperature, radomes, missile nozzles, supports and spacers in atomic reactors, Carriers of nuclear fission material, etc.
5. It can be made into artificial joints in medical engineering.
6. The silicon nitride all-ceramic engine under development replaces the same type of metal engine.

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Tag: Silicon Nitride