Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 38, Issue 2, Pages 479-485Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2017.09.004
Keywords
SiC/SiC-SiBC composites; Strength retention ratio; Oxidation resistance; CTE match
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Funding
- National Natural Science Foundation of China [51332004, 51372204, 51602258, 51702261]
- Fundamental Research Funds for the Central Universities
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The mechanical behavior and oxidation resistance of SiC/SiC-SiBC composites were studied in this work. According to the debonding criterion of He and Hutchinson, the debonding could occur at the BN interphase, which insures that the fibers can well play the strengthening and toughening performance. The oxidation resistance of SiC/SiC-SiBC composites consisting of SiC fibers with thermal expansion coefficients (CTE) of 5.1 x 10(-6) K-1 and 4.0 x 10-6 K-1 was compared. The composites consisting of SiC fibers with higher CTE show slight weight changes at 800, 1000, and 1200 degrees C, and the corresponding strength retention ratios are 109.6%, 103.2% and 102.9%, exhibiting excellent oxidation resistance. The CTE of composites consisting of SiC fibers with higher CTE matches well with the CTE of SiC coating, so rarely no cracks can be formed in the coating, which inhibits the inward diffusion of oxidizing medium and leads to high strength retention ratios after oxidation tests.
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