| 摘要 |
<p>A process for producing a sintered ceramic body, which comprises heating a semi-inorganic block copolymer at a temperature of from 500 to 2300°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-CH<Sub>2</Sub>)̵ 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°C to 2300°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
<UnorderedLists id="ula01" listStyle="none"><ListItem>(1) an amorphous material consisting substantially of Si, Zr and C and optionally of O, or</ListItem><ListItem>(2) an aggregate consisting substantially of ultrafine crystalline particles of (β-SiC. ZrC, a solid solution of β-SiC and ZrC and ZrC<Sub>1-x</Sub> wherein 0 <x <1 and having a particle diameter of not more than 500A. or</ListItem><ListItem>(3) a mixture of said amorphous material (1) and said aggregate (2) of ultrafine crystalline particles.</ListItem></UnorderedLists></p> |
