Journal
CERAMICS INTERNATIONAL
Volume 41, Issue 7, Pages 8868-8877Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2015.03.144
Keywords
A. Sintering; B. Composites; C. Corrosion; C. Thermal shock resistance
Categories
Funding
- National Science Foundation for Distinguished Young Scholars of China [51225203]
- National Natural Science Foundation of China [51321061, 51272300]
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The ablation properties and mechanisms (under oxyacetylene combustion) together with thermal shock behavior of SiCf/C-f/SiBCN ceramic composites were investigated. The solid ablation products are primarily amorphous SiO2 and cristobalite. The primary ablation mechanisms include fiber and ceramic matrix oxidation, evaporation of B2O3 (1) and SiO2 (1), and mechanical exfoliation. SiCf/Cf/SiBCN has a significantly low mass ablation rate and a desirable linear ablation rate. The combination of crack deflection caused by SiC and carbon fibers, fiber pull-out and debonding improves thermal shock resistance and thus leads to the absence of surface macrocracks. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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