Oxidation of zirconium diboride-silicon carbide ceramics under an oxygen partial pressure of 200 Pa: Formation of zircon |
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| Authors: | Dong Gao Jingying Fu Yang Song |
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| Affiliation: | a Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, PR China
b National Key Laboratory of Advanced Functional Composite Materials Technology, Beijing 100076, PR China |
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| Abstract: | The formation and evolution of zircon during oxidation of ZrB2-20 vol.% SiC ceramics under a low oxygen partial pressure of 200 Pa is studied. The formation mechanism of zircon is proposed according to experimental results and thermodynamic consideration. And the main reason to the formation of zircon can be attributed to the active oxidation of SiC. Two steps can be divided for the formation and evolution of zircon: (1) nucleation from silica glass; and (2) crystal growth into prism like particles. Furthermore, the emergence of zircon significantly improves the oxidation resistance performance. |
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| Keywords: | A Ceramic matrix composites B EPMA C Oxidation |
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