| 摘要 |
A process for producing a sintered ceramic body, which comprises heating a semi-inorganic block copolymer at a temperature of from 500 DEG to 2300 DEG C. in an environment of vacuum or inert gases, reducing gases or hydrocarbon gases, said copolymer comprising polycarbosilane blocks having a main-chain skeleton composed mainly of carbosilane units of the formula (Si-CH2) and zirconoxane units of the formula (Zr-O); and shaping the heated product, and simultaneously with, or after, the shaping of the heated product, sintering the shaped product at a temperature of from 800 DEG C. to 2300 DEG C. in an environment of vacuum or inert gases, reducing gases or hydrocarbon gases; and a sintered ceramic body consisting substantially of Si, Zr and C and optionally of O, said sintered body being composed substantially of (1) an amorphous material consisting substantially of Si, Zr and C and optionally of O, or (2) an aggregate consisting subtantially of ultrafine crystalline particles of beta -SiC, ZrC, a solid solution of beta -SiC and ZrC and ZrC1-x wherein O<x<1 and having a particle diameter of not more than 500 ANGSTROM , or (3) a mixture of said amorphous material (1) and said aggregate (2) of ultrafine crystalline particles. |
