期刊
CERAMICS INTERNATIONAL
卷 38, 期 1, 页码 9-13出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2011.06.063
关键词
C/SiC composites; Oxidation protective coating; Slurry; Chemical vapor deposition
资金
- National Natural Science Foundation of China [90916002]
Three-dimensional carbon fiber reinforced silicon carbide (C/SiC) composites were fabricated by precursor infiltration and pyrolysis (PIP) with polycarbosilane as the matrix precursor, SiC coating prepared by chemical vapor deposition (CVD) and ZrB2-SiC/SiC coating prepared by CVD with slurry painting were applied on C/SiC composites, respectively. The oxidation of three samples at 1500 degrees C was compared and their microstructures and mechanical properties were investigated. The results show that the C/SiC without coating is distorted quickly. The mass loss of SiC coating coated sample is 4.6% after 2 h oxidation and the sample with ZrB2-SiC/SiC multilayer coating only has 0.4% mass loss even after oxidation. ZrB2-SiC/SiC multilayer coating can provide longtime protection for C/SiC composites. The mode of the fracture behavior of C/SiC composites was also changed. When with coating, the fracture mode of C/SiC composites became brittle. When after oxidation, the fracture mode of C/SiC composites without and with coating also became brittle. Crown Copyright (C) 2011 Published by Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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