期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.03.053
关键词
C/SiC composites; Oxidation; Atomic oxygen; Mechanical behavior
类别
资金
- Natural Science Foundation of China [50820145202]
- 973 Project [2011CB605806]
The advanced high temperature composites have been considered as structural or functional material in complex and harsh environments, which usually comprise of various oxidizing particles such as molecular oxygen (MO), atomic oxygen (AO) and molecular water. This study aimed to investigate C/SiC behaviors in single factor or combination environments. In the MO oxidation, an inert surface is formed on SiC. At the AO oxidation, the Si of SiC is preferentially etched off leaving a certain depth of C layer on the sample. Two types of coupled oxidations defined as mode A (first MO and then AO oxidation), and mode B oxidation (first AO and then MO oxidation) were investigated systematically in this study, and found that the prior oxidative effect majorly determined the corresponding coupled oxidation behavior. From microscopic observation and fractural test, the mode B oxidation induced a more serious degradation upon the material than that of the mode A, which is illustrated by the proposed erosion mechanisms for the modes A and B. (C) 2012 Elsevier B.V. All rights reserved.
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