前駆体法によって合成されたC-SiC系複合繊維の酸化

概要

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The oxidation mechanism of C-SiC composite fiber, which was prepared from carbon fiber (Kynol) and ethyl silicate, has been investigated. The oxidation rate was determined by means of a thermobalance in an atmosphere of O_2 at temperatures from 673 to 1473 K. The oxidation curves were characterized by S-shape. In the second stage, the oxidation obeyed a linear rate law. The oxidation rate of the composite fiber was lower than that of the carbon fiber. Below 973 K, the activation energy for the oxidation was estimated to be 115 kJ・mol^<-16gt;and the gas diffusion through the porous SiC layer was a rate-determining step. Above 973 K, the activation energy was estimated to be 24 kJ・mol^<-1>. The oxidation was considered to be controlled jointly by the gas diffusion to the surface of the fiber and the gas diffusion through the porous SiC layer.
社団法人日本セラミックス協会の論文
1995-05-01