Abstract
Oxidation tests were carried out on HfB2-SiC, HfB2-HfC, HfB2-WC-SiC, and HfB2-WSi2 ceramics using an oxyacetylene torch. The samples were oxidized between 2100 and 2300°C. From cross-sectional images, scale non-adherence was noted as a limiting factor in oxidation resistance. The sample with the best scale adherence was HfB2-WSi2. Factors involving scale non-adherence such as vapor pressure, coefficient of thermal expansion mismatch and phase transformations were considered. In comparing the scale adherence of the samples it was hypothesized that vapor pressure buildup is the principal contributing factor in the scale adherence differences observed among the tested samples. However, the coefficient of thermal expansion mismatch and HfO2 phase transformation cannot be neglected as contributing factors to scale non-adherence in all samples.
Original language | English |
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Pages (from-to) | 1045-1051 |
Journal | Journal of the European Ceramic Society |
Volume | 34 |
Issue number | 5 |
Early online date | 4 Dec 2013 |
DOIs | |
Publication status | Published - 1 May 2014 |
Keywords
- Hafnium diboride
- Oxidation
- Silicon carbide
- Tungsten silicide
- Ultra high temperature ceramics
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry