Heat treatment of silica-fiber-reinforced BN-Si3N4 matrix composite

Heat treatment of silica-fiber-reinforced BN-Si3N4 matrix composite A new wave-transparent composite reinforced by silica fibers with a hybrid matrix comprising BN and Si3N4 was prepared by precursor infiltration and pyrolysis, and it was heat-treated at elevated temperatures. The variations of the composite during heat treatments were characterized and investigated by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The as-received composite exhibits good mechanical properties, and it is almost amorphous. When treated at 1600°C, it turned brittle, and silica fibers in it were fused; the composite showed a good crystalline form. When treated at 2100°C, the composite broke into pieces, and the composition showed only BN. Si3N4 was decomposed, and silica fibers were volatilized. The presence of BN probably affected the phase transitions of silica fibers. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Refractories and Industrial Ceramics Springer Journals

Heat treatment of silica-fiber-reinforced BN-Si3N4 matrix composite

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Springer US
Copyright © 2007 by Springer Science+Business Media, Inc.
Chemistry; Characterization and Evaluation of Materials; Materials Science; Ceramics, Glass, Composites, Natural Methods
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