繊維強化セラミックスにおける界面炭素層の酸化挙動の定量解析

概要

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An oxidation model for carbon interface in ceramic matrix composites was developed to evaluate the parameters that affect the oxidation rate of the carbon interface. The model considers geometrical changes of pores resulting from both consumption by oxidation of the carbon interface and oxygen consumption due to oxidation of the pore walls. The lengths of oxidized carbon interface were calculated for various cases using the oxygen concentration profile in the pore. Oxidation temperatures, interface thickness, oxygen concentration in the atmosphere, oxidation parameters on the pore walls were found to be the main parameters that control the oxidation behavior of carbon interfaces. By the present treatment, the results of interfacial shear tests could be quantitatively understood. The lengths of oxidized carbon interfaces increased with increasing temperature, interface thickness, and oxygen concentration in atmosphere. Furthermore, oxidation simulations were conducted in various ceramic matrix composites. In case of fibers and matrices with high volume expansion coefficients during oxidation reaction, the oxidation of the carbon interface was drastically inhibited.
社団法人日本セラミックス協会の論文
2001-03-01