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Fiber Coatings for SiC-Fiber-Reinforced BMAS Glass-Ceramic Composites

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Interfaces in SK-fiber-reinforced glass-ceramic matrix composites were modified by applying different coatings to the fibers and varying the coating thickness. Coatings of SiC/BN, Si3N4/BN, and BN were applied to the fibers by CVD prior to composite fabrication. Interfacial microstructures were characterized using high-resolution and analytical transmission electron microscopy. Oxidation of the SiC fibers during composite fabrication was suppressed by the fiber coatings, provided that the coatings were sufficiently thick to prevent oxygen diffusion from the matrix. The SiC/RN and BN coatings were stable during high-temperature exposures, while the Si3N4/BN coating underwent chemical reactions.
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Document Type: Research Article

Affiliations: 1: Division of Engineering, Brown University, Providence, Providence, Rhode Island 02912 2: Department of Materials Science, University of Southern California, Los Angeles, California 90089-0241 3: United Technologies Research Center, East Hartford, Connecticut 06108

Publication date: 1997-01-01

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