前駆体法によるC-SiC系複合繊維の合成

概要

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C SiC composite fiber was obtained by heating a C SiO_2 precursor, prepared frorn carbon fiber (Kynol) impregnated with ethylsilicate. The mechanism of SiC formation from the precursor has been investigated. The reaction rate was determined by means of a ther mobalance in an atrnosphere of Ar at temperatures from 1673 to 1973 K. The reaction products were exa mined by X ray diffraction and chemical analyses. The reaction products were SiC and SiO. The yield of SiC in creased with increasing SiO_2 content in the precursor and heat treatment temperature. The particles of SiC coarsened at high temperatures. The SiC Iayer grew from the surface to the fiber core. The continuous con centration gradient of Si was observed in the reaction layer. The reaction rate was described by the two dimensional contracting disc formula for diffusion coll trol. The activation energy was 304 kJ/mol. The rate determining step is probably the diffusion through the SiC Iayer.
社団法人日本セラミックス協会の論文
1994-09-01