| 摘要 |
PURPOSE:To obtain inexpensive SiC having good quality and wide utilization range, by firing a blend of dunite with a reducing agent, e.g. charcol char, etc., in a vacuum atmosphere or further together mixed with a reducing gas. CONSTITUTION:Dunite having the chemical composition expressed by the formula (R2 is Ca, Mg, Fe, Mn, etc.) is blended with a reducing agent, e.g. charcoal char or ferrosilicon, etc., to give 1:0.3-3.0 ratio. The resultant blend is then put in a porcelain boat, etc., and placed in a furnace. The blend is then fired in the interior of the furnace under vacuum atmosphere of <=10<-1>mmHg or vacuum atmosphere in which a reducing gas, e.g. CO2, etc., is fed into to give >=20mmHg pressure at >=1,300 deg.C. The excess C in the resultant product is then fired at 300-900 deg.C in air and removed to afford the aimed SiC. |
