| 摘要 |
PURPOSE:To produce fine, uniform and readily sintered beta-sialon based powder, by adding a solution of an aluminum compound and a sintering assistant to an Si alkoxide containing dispersed carbon powder having a specific particle diameter and heating the formed reaction precipitates under specific conditions. CONSTITUTION:Fine carbon particles having <=0.1mu particle diameter are dispersed in an Si alkoxide, e.g. methyl silicate, by ultrasonic vibration, etc., and a solution of an aluminum compound, e.g. Al(NO3)3, containing a sintering assistant, e.g. MgO, or a salt thereof, dissolved therein is added to the dispersion. The mixing ratio of the Si alkoxide to the aluminum compound is about 0.5-25 (Si/Al). The resultant reaction precipitates formed by the mixing are heated at about 400-700 deg.C to release water and then the resultant precipitates are fired in a nitrogen gas stream at 1,350-1,550 deg.C for about 0.5-50hr. Thereby, fine powder containing uniformly mixed beta-sialon based powder and sintering assistant and having about 0.3-0.5mu particle diameter is obtained and fired in a nitrogen gas stream at about 1,700-1,800 deg.C to form a sintered material. |
