Si-Ti-C-O繊維結合型セラミックスの界面せん断特性に及ぼす温度と酸化の影響

概要

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Debonding at the fiber/matrix interface and Subsequent frictional sliding considerably affect the fracture toughness of fiber-reinforced ceramic composites. In this study, the interfacial shear properties of a Si-Ti-C-O fiber-bonded composite were investigated both at room temperature and at elevated temperatures. A jig suitable for punch-out experiments was newly designed for this purpose. Punch-out experiments were performed at room temperature, 700 and 1400°C for various exposure times. It was found that the interfacial shear properties significantly depended on the oxidation behavior of the Si-Ti-C-O fiber-bonded material. At 700°C, a turbostratic carbon layer at the fiber/matrix interface is prone to oxidation, which weakens the interfacial shear properties in a catastrophic manner. At 1400°C, the quick formation of a silica layer protects the carbon from oxidation, resulting in an enhanced interfacial shear strength.
社団法人日本セラミックス協会の論文
1999-01-01