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Silicon Nitride Ceramic Properties

Date：2024-04-09 Hits：34

I. Physical properties of silicon nitride


① Thermal properties: silicon nitride belongs to the high temperature refractory substances, high pressure creep resistance, binder-free reaction sintered silicon nitride load softening point can be as high as 1800 ℃; ② Good thermal conductivity, 20W/mK; ② Thermal conductivity; ① Thermal conductivity, 20W/mK; ② Thermal conductivity, 20W/mK.


③ small coefficient of thermal expansion; ④ good electrical insulation properties, 20W/mK


④ good electrical insulation properties, dielectric coefficient is small, high breakdown voltage.


Second, the chemical properties of ammonia silicon.


① oxidation resistance: 800C below the dry atmosphere does not react with oxygen.


② anti-molten metal corrosion: silicon nitride on a single metal melt (except copper) does not infiltrate, not subject to corrosion; ③ resistance to acid and alkali salt corrosion: easily soluble in gas fluoride acid, and dilute acid does not work.


Third, the mechanical properties of ammonia silicon.


① high-temperature strength is good, 1200 ℃ high-temperature strength and room temperature strength compared with little attenuation, in addition, its high-temperature creep rate is very low. These are determined by the nature of strong covalent bonds; ② high hardness, second only to diamond, cubic BN, BC and a few other super-hard materials; ③ small friction coefficient, self-cleaning.


③ Low coefficient of friction, self-lubricating, similar to the metal surface of refueling.


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