Abstract
A joint program to develop and evaluate a continuous fiber reinforced ceramic.matrix composite (CFCC) has been conducted by National Aerospace Laboratory, Ube Industries Ltd., Shikibo Ltd.. and Kawasaki Heavy Industries Ltd. The composite contains Tyranno^<TM> Lox-M grade fiber (Si 54%, Ti 2%, C 32%, O 12%, mass%) with an additional surface modification in order to improve interface properties. The composite exhibits excellent tensile strength at room temperature and creep strength at elevated temperature up to 1200℃, and is referred to as "NUSK-CMC" from the initials of the collaborators. To improve mechanical properties of NUSK-CMC above 1200℃ Tyranno^<TM> ZMI grade fiber (Si 56%, Zr 1%, C 34%, O 9%) was used in the new CFCCs. because Tyranno^<TM> ZMI fiber maintains high strength up to 1400℃. In this study, an orthogonal 3-D woven Tyranno^<TM> ZMI fiber / Si-C matrix composites were fabricated by polymer impregnation pyrolysis (PIP) process and chemical vapor infiltration (CVI) process. Three kinds of interpahses: pyro-carbon, CVD-h-BN, and coating free C-rich interphase were prepared for fiber/matrix interface. The composites with C and h-BN interphase and CVI-SiC matrix exhibited excellent tensile properties at room temperature.
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