Silicon Nitride is a kind of advanced ceramic material with high hardness, stable structure, small thermal expansion coefficient, excellent oxidation resistance and corrosion resistance, which integrates excellent thermal and chemical properties. Main purpose: It is mainly used in metallurgical industry, mechanical industry, chemical industry, semiconductor, aviation, atomic energy and other industries, medical artificial joints, and all-ceramic engines. Items Nano-Si3N4 phase content (%) amorphous chemical component N(wt%) 38.5 38.5 38.5 O(wt%) 1.25 1.25 1.25 C(wt%) 0.2 0.2 0.2 Fe(ppm)