Silicon Nitride Ceramic

Silicon Nitride (Si3N4) Ceramics

Silicon nitride ceramic is an inorganic material ceramic that does not shrink during sintering. The strength of silicon nitride, especially hot-pressed silicon nitride, is one of the hardest substances in the world. Si3N4 ceramic is a covalent bond compound with high strength, low density, and high-temperature resistance.

As an excellent high-temperature engineering material, Si3N4 ceramic material has the most advantages in its application in high-temperature fields. It is extremely resistant to high temperatures, and its strength can be maintained up to 1200 ° C without decreasing. It will not melt into melt after being heated. It will not decompose until 1900 ° C. It has amazing chemical resistance and can resist almost all inorganic acids. And caustic soda solution below 30%, it is also resistant to the corrosion of many organic acids; it is also a high-performance electrical insulation material.

Preparation of Si3N4 ceramics includes reaction sintering, hot-pressing sintering, pressure-less sintering, and gas pressure sintering. Due to different preparation processes, each type of silicon nitride ceramic has different microstructures (such as porosity and pore morphology, grain morphology, intergranular morphology, intergranular second phase content, etc.). Gas pressure sintering is the most popular way at present.