期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 32, 期 14, 页码 3875-3883出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2012.05.021
关键词
Microstructure-final; Thermal properties; Borides; SiC
资金
- National Aeronautics and Space Administration [NNX08AB35A]
- Air Force Office of Scientific Research [FA9550-11-1-0201-AFOSR]
The oxidation performance of ZrB2-SiC ultra-high temperature ceramics with SiC content ranging from 20 to 80 vol% has been evaluated at 1773 K for 50 h and at 2073 K for 20 min. Oxidation reaction pathways were interpreted using volatility diagrams of the ZrB2-SiC system. At 1773 K for 50 h, all ZrB2-SiC composites from 20 to 80 vol% SiC formed a protective SiO2 surface coating. Samples with <= 50 vol% SiC developed a distinguishable SiC-depleted layer at 1773 K and 2073 K. High temperature torch testing for 20 min at approximately 2073 K revealed that samples with >= 65 vol% SiC exhibit a depression under the torch flame. Samples rich in ZrB2 were dominated by a ZrO2 layer after a similar exposure. The overall weight density of ultra-high temperature ceramics can be reduced with improved oxidation performance at 1773 K by adding at least 65 vol% SiC. (C) 2012 Elsevier Ltd. All rights reserved.
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