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Carbon‐Fiber‐Reinforced Composites with Graded Carbon‐Silicon Carbide Matrix Composition
Author(s) -
Deng Jingyi,
Wei Yongliang,
Liu Wenchuan
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb01976.x
Subject(s) - chemical vapor infiltration , composite material , materials science , microstructure , silicon carbide , scanning electron microscope , transmission electron microscopy , carbon fibers , microanalysis , carbide , ceramic matrix composite , silicon , composite number , chemistry , metallurgy , nanotechnology , organic chemistry
Carbon‐silicon carbide (C‐SiC) graded‐matrix composites were prepared via chemical vapor infiltration with carbon and SiC codeposition from methyltrichlorosilane (CH 3 SiCl 3 ), acetylene (C 2 H 2 ), argon, and hydrogen. The graded‐matrix composites were prepared by gradually varying the source gases, from C 2 H 2 to CH 3 SiCl 3 , in a semicontinuous process. Oxidation resistance, wear, and mechanical tests were conducted, and the microstructure was observed via optical microscopy, electron probe microanalysis, transmission electron microscopy, and scanning electron microscopy. The results show that this material seems to be macroscopically homogeneous, as an integral part of the entire material; however, microscopic examination shows a gradient variation of the matrix sheaths around each fiber. The oxidation resistance of the material is significantly superior to that of a C/C material, which is a promising thermostructural material, because of its low density, good mechanical properties, and good resistance to oxidation.