Crystallization behaviors of carbon fiber reinforced BN-Si3N4 matrix composite by Bin Li, Chang-Rui Zhang, Si-Qing Wang, and Feng Cao

Crystal Research and Technology

Cryst. Res. Technol. 42, 648 (2007) - Abstract -

Crystallization behaviors of carbon fiber reinforced BN-Si₃N₄ matrix composite

Bin Li, Chang-Rui Zhang, Si-Qing Wang, and Feng Cao

State Key Laboratory of Advanced Ceramic Fibers & Composites, College of Aerospace & Materials Engineering, National University of Defense Technology, Changsha 410073, P. R. China

Keywords	crystallization, nitride, composite, interface, boron carbide
PACS	81.05.Je
DOI	10.1002/crat.200610882

The crystallization behaviors of a new carbon fiber reinforced composite with a hybrid matrix comprising BN and Si₃N₄ prepared by precursor infiltration and pyrolysis were investigated by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. The results show that the as-received composite is almost amorphous, and its main composition is BN and Si₃N₄. When heat treated at 1600°C, the composite is crystallized and shows a much better crystal form. When heat treated at 2100°C, Si₃N₄ in the matrix is decomposed, and BN exhibits a relatively complete crystallization. The existence of B₄C and SiC is detected, which indicates the interfacial chemical reactions between nitride matrices and carbon fibers. The surface morphology of carbon fibers in the composite changed significantly when heated from 1600 to 2100°C, which also proved the occurrence of interfacial chemical reactions.

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