| 摘要 |
PURPOSE:To produce the fine SiC powder at the comparatively low temp. by heating CaC2 powder and SiO2 powder. CONSTITUTION:After CaC2 powder of 20-200mum particle size and SiO2 powder of <=200mum particle size are mixed so that CaC2/SiO2 molar ratio is regulated to 0.8-3.0 and heated at 900-1,800 deg.C for 1-20 minutes in the inert gas atmosphere, Ca compd. is removed by hydrochloric acid from the mixture and it is heated in air to decarbonate it and furthermore Si and SiO2, etc., are removed by a mixture liquid of hydrofluoric acid and nitric acid and it is washed to obtain high-purity SiC fine powder. |
