| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing a high purity SiC fine powder in which few adhesion particles formed by the secondary bonding of powdery particles are contained and which is especially excellent in mono-spherical property suitable as a sintering raw material. <P>SOLUTION: The method for producing the high purity SiC fine powder comprises: adding phenols, formaldehyde, and an aqueous ammonia solution into a silica sol or a silica suspension containing silica fine particles prepared from a silicon alkoxide and each having a particle diameter of 10-2,000 nm to polymerize the phenols and formaldehyde to form an SiC precursor having such a core-shell structure that the periphery of each silica fine particle being a nucleus is covered with a phenol resin; firing the SiC precursor by heat treating it at 800-1,000°C in an oxygen-free atmosphere; and then silicifying it at 1,400-2,200°C in an inert atmosphere. Further, it is preferable that the volume ratio of the phenol resin to silica fine particles constituting the SiC precursor is 33-500%. <P>COPYRIGHT: (C)2007,JPO&INPIT |
