| 摘要 |
PURPOSE:To prepare SiC whisker contg. no powdery or bent SiC and having high linearity by heating directly a molded body comprising siliceous raw material contg. SiO2 and a molded body comprising carbonaceous raw material contg. C at high temp. in specified H2 atmosphere. CONSTITUTION:A molded body molded previously to a specified shape from SiO2-contg. siliceous raw material (e.g. siliceous stone powder, powdery silica gel, clay, etc.) and a molded body molded previously to a specified shape from C-contg. carbonaceous raw material (e.g. carbon black, powdery active carbon, carbon obtd. by the heat treatment of tar or pitch) are heated at >=1,400 deg.C in H2-contg. atmosphere contg. >=20vol% H2. Formation of SiC whisker by the gaseous phase reaction is prompted. On the other hand, reactions in the solid phase between the SiO2-contg. raw material and the C-contg. raw material or direct gas/solid reaction between SiO2 vapor and solid C-contg. raw material, are retarded. Thus, powdery or bent SiC is scarcely formed and SiC whisker having superior linearity is obtd. at high yield. |
