ムライトーSiCウイスカー複合セラミックスの酸化

概要

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Oxidation behavior of mullite composites containing 10 to 30 vol% of SiC- whisker (SiC- w) has been studied at 1300℃ in dry air. As the volume fraction of SiC- w increased, the weight gain increased. The weight gain ,curve obeyed the parabolic law for the SiC- w content of 10 vol% ard at the oxidation time shorter than 200 h. However, the weight gain of the specimen containing more than 20 vol% SiC- w was accelerated when the oxidation time exceeded 200 h. It was found that impurities such as Na_2O, K_2O and CaO, originally contained in the SiC- w, were concentrated near the surface of the specimen. The acceleration of the weight gain for longer oxidation duration is explained in terms of corrosion of mullite and SiC- w by the liquid phase formed through the reaction between oxidized SiC- w and the impurities.
社団法人日本セラミックス協会の論文
1989-09-01