The Properties And Applications of Silicon Nitride Ceramics
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Update time : 2021-04-27 09:01:09
Silicon nitride ceramics is a synthetic material. In its structure, the covalent bond between silicon atoms and nitrogen atoms is strong. Therefore, silicon nitride ceramics have high strength, high hardness, corrosion resistance, oxidation resistance, and wear resistance, good thermal shock resistance and other characteristics.
Silicon nitride ceramics are considered by the material industry as an engineering ceramic material with excellent comprehensive properties and can be used in high-temperature fields.
The properties of silicon nitride ceramics
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 performances are as follows:
1. Silicon nitride material has low linear expansion coefficient, good thermal conductivity, and excellent thermal shock resistance;
2. The hardness of silicon nitride is very large, 99.5, second only to a few superhard materials such as diamond and BN;
3.The friction coefficient of silicon nitride is small, 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 high temperature creep is small;
5.Silicon nitride material has good insulating properties and is a good insulator material at high temperature;
The applications of silicon nitride ceramics
Due to the excellent properties of Si3N4 ceramics, it has been widely used in many industrial fields.
Silicon nitride ceramics are used in the machinery industry as turbine blades, mechanical seal rings, high-temperature bearings, high-speed cutting tools, permanent molds, etc.;
Silicon nitride ceramics are used as parts on thermal equipment such as crucibles, burners, and aluminum reduction cell linings in the metallurgical industry;
Silicon nitride ceramics are used as corrosion-resistant and wear-resistant parts in the chemical industry, including ball valves, pump bodies, burners, vaporizers, etc.;
Silicon nitride ceramics are used as film capacitors and high-temperature insulators in the electronics industry;
Silicon nitride ceramics are used as radomes, engines, etc. in the aerospace field;
Silicon nitride ceramics are used in the atomic energy industry as supports and spacers in nuclear reactors, and as carriers for nuclear fission materials.
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