The purity of silicon nitride powder is high and it has good chemical stability, high thermal conductivity, low thermal expansion coefficient. It is the good wear resistance material which is widely used in the production of polysilicon ingot in solar energy industry. The indicator is as following: phase,90%N,38.5%O,1.8%Fe,20 ppm, Al,10 ppm, Ca,10 ppm,P,4 ppm, B,3 ppm and so on.
