Abstract
To meet the ultrahigh temperature requirements of a thermal protection system, an ultrahigh temperature phase of ZrB2 was introduced into a SiBCN matrix that was fabricated using a reactive spark plasma sintering method. The thermal ablation behavior of SiBCN-Zr composites was investigated using an oxyacetylene flame test. The test results indicated that the ablation behavior of the modified ceramic composites was significantly improved over that of a monolithic SiBCN ceramic. The linear and mass ablation rates of the SiBCN-Zr material were found to be 0.004 mm/s and 4.75×10−4 g/s, which was indicative of excellent ablation resistance. Analysis of the material after thermal ablation testing showed that ablation products mainly consisted of the ZrSiO4, SiO2 and ZrO2 phases. A reaction occurred between the SiO2 and ZrO2 phases in the central region of the ceramic forming ZrSiO4 that protected the material from further thermal damage. A loose and porous oxidation layer was found from the matrix based on analysis of a cross-section image.
Original language | English |
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Pages (from-to) | 7978-7983 |
Number of pages | 6 |
Journal | Ceramics International |
Volume | 43 |
Issue number | 11 |
DOIs | |
Publication status | Published - 1 Aug 2017 |
Keywords
- Ablation properties
- SiBCN
- SPS
- ZrB