Abstract: Silicon carbide is used widely, the quality of the powder is critical to the preparation of high performance silicon carbide materials, the most commonly used method is mechanical shaping, but the results are less effective.The influence of MgCl2-CaCl2 molten salt system on grain morphology, particle size distribution, D50、D90 of silicon carbide powder was studied by chemical shaping.The results show that molten salt of MgCl2-CaCl2 helps the growth of β-SiC powder grains greatly, with the holding temperature increasing, grain morphology transforms from lamellar structure to a columnar structure, D50 and D90 increase;with the holding time increasing, grain morphology transits from small particles to large particles, D50 and D90 increase.

Key words: β-SiC powder;shaping;MgCl2-CaCl2 molten salt system