Journal
CORROSION SCIENCE
Volume 51, Issue 4, Pages 820-826Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2009.01.026
Keywords
Ceramic matrix composites; SEM; XPS; Weight loss; Oxidation
Funding
- National Science Foundation in China [90405015, 50672076, 50425208, 50642039, 50820145202, 50802076]
- Doctorate Foundation of Northwestern Polytechnical University [CX200505]
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An amorphous boron carbide (a-BC) coating was prepared by LPCVD process from BCl(3)-CH(4)-H(2)-Ar system. XPS result showed that the boron concentration was 15.0 at%, and carbon was 82.0 at%. One third of boron was distributed to a bonding with carbon and 37.0 at.% was dissolved in graphite lattice. A multiple-layered structure of CVD SiC/a-BC/SiC was coated on 3D C/SiC composites. Oxidation tests were conducted at 700, 1000, and 1200 degrees C in 14 vol.% H(2)O/8 vol% O(2)/78 vol.% Ar atmosphere up to 100 h. The 3D C/SiC composites with the modified coating system had a good oxidation resistance. This resulted in the high strength retained ratio of the composites even after the oxidation. (C) 2009 Elsevier Ltd. All rights reserved.
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