Volatility diagram of ZrB2‐SiC‐ZrC system and experimental validation |
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| Authors: | Ying Lu Ji Zou Fangfang Xu Guo‐Jun Zhang |
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| Affiliation: | 1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China;2. University of the Chinese Academy of Science, Beijing, China;3. School of Metallurgy and Materials, University of Birmingham, Birmingham, UK;4. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Institute of Functional Materials, Donghua University, Shanghai, China |
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| Abstract: | A volatility diagram of zirconium carbide (ZrC) at 1600, 1930, and 2200°C was calculated in this work. Combining it with the existing volatility diagrams of ZrB2 and SiC, the volatility diagram of a ternary ZrB2‐SiC‐ZrC (ZSZ) system was constructed in order to interpret the oxidation behavior of ZSZ ceramics. Applying this diagram, the formation of ZrC‐corroded and SiC‐depleted layers and the oxidation sequence of each component in ZSZ during oxidation and ablation could be well understood. Most of the predictions from the diagrams are consistent with the experimental observations on the oxidation scale of dense ZrB2‐SiC‐ZrC ceramics/coatings after oxidation at 1600°C or ablation at 1930 and 2200°C. The reasons for the discrepancy are also briefly discussed. |
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| Keywords: | microstructure oxidation volatility diagrams ZrB2‐SiC‐ZrC |
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