Formation mechanism and high temperature mechanical property characterization of SiC depletion layer in ZrB2/SiC ceramics |
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| Affiliation: | 1. Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden;2. Department of Applied Physics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden;3. Department of Materials and Manufacturing - Casting, Jönköping University, SE-551 11 Jönköping, Sweden;1. School of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Republic of Korea;2. Division of Advanced Materials Engineering, Kongju National University, Cheonan, Chungnam 330-717, Republic of Korea;1. Department of Mechanical Engineering, École Polytechnique de Montréal, Montréal, Québec H3C 3A7, Canada;2. Regroupement québécois sur les matériaux de pointe (RQMP), École Polytechnique de Montréal, Montréal, Québec H3C 3A7, Canada;3. Department of Engineering Physics, École Polytechnique de Montréal, Montréal, Québec H3C 3A7, Canada |
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| Abstract: | When ZrB2/SiC ceramics are exposed to high temperatures, a SiC depletion layer will appear near the material surface. Due to the degradation of mechanical properties for the SiC depletion layer, the ZrB2/SiC ceramics might fail initially at the SiC depletion layer. Based on chemical reaction analysis and microstructural observation, a pore evolution model is presented to characterize the formation mechanisms of the SiC depletion layer, which can calculate the variation in the volume fraction of each constituent during the oxidation process. The micromechanical models are developed to analyze the mechanical properties of the SiC depletion layer during high temperature oxidation. It is found that relative modulus and relative strength of the SiC depletion layer initially decrease and then gradually rise with the increase of oxidation time. As the SiC content of ZrB2/SiC ceramics increases, the porosity of SiC depletion layer increases as well, whereas the mechanical properties significantly decrease. |
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