Crystallization behaviors of carbon fiber reinforced BN-Si3N4 matrix composite

✍ Scribed by Bin Li; Chang-Rui Zhang; Si-Qing Wang; Feng Cao

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 152 KB
• Volume: 42
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.200610882

✦ Synopsis

The crystallization behaviors of a new carbon fiber reinforced composite with a hybrid matrix comprising BN and Si 3 N 4 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 Si 3 N 4 . When heat treated at 1600°C, the composite is crystallized and shows a much better crystal form. When heat treated at 2100°C, Si 3 N 4 in the matrix is decomposed, and BN exhibits a relatively complete crystallization. The existence of B 4 C 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.