熱酸化法によって不融化されたポリカルボシラン繊維のセラミックス化機構

概要

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The conversion mechanism from oxidation cured poly carbosilane to SiC ceramic fibers have been investigat ed. The fibers were heated isothermally and the conversion rate was determined by thermogravimetry at tem peratures from 553 to 1673 K in an Ar stream. The heat treated fiber was examined by X ray diffraction, infra red spectroscopy, specific resistance measure ment and tensile test. Below 800 K, the fiber was in or ganic state. In the temperature range of 800 to 1000 K, the conversion produced a very large increase in ten sile strength. And then, in the temperature range from 1000 to 1500 K, β-SiC crystallites grew and the maxi mum strength was obtained. Above 1500 K, the pyrolysis coarsened the SiC crystals and lowered the strength. The conversion rate was described by the first order rate equation. The activation energy was 42.8 kJ .mol-1 The conversion is considered to be controlled by the chemical reaction and the mass transfer through the gas film.
社団法人日本セラミックス協会の論文
1994-10-01