• Journal of Inorganic Materials
  • Vol. 36, Issue 10, 1067 (2021)
FENG Mingxing, WANG Bin, XU Pengyu, TU Bingtian, and WANG Hao*
Author Affiliations
  • State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
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    Spinel-type ceramics have great application prospects owing to their excellent thermomechanical properties in the field of high-temperature structural materials. In this study, a new approach that combined bond valence models with high-temperature mechanical theoretical characterization models was established to predict the high-temperature thermomechanical properties of spinel-type ceramics based on temperature-dependent crystal structure. Further more, the relationship between crystalline structure and high-temperature properties was clarified. The high-temperature fracture strength and fracture toughness of MgAl2O4 transparent ceramic, were predicted by this approach, which agreed well with the experimental values. It is shown that the ratio of cation inversion, hardness and bulk modulus of chemical bonds in MgAl2O4 vary significantly with temperature around 800 ℃. However, due to coupling effect of the coordinated polyhedra, the temperature-dependent cation inversion can hardly affect the high-temperature thermomechanical properties of MgAl2O4 transparent ceramic.

    随着现代科学技术的进步与发展, 陶瓷材料在高温领域的应用越来越广泛, 表征及提高陶瓷材料的高温热机械性能备受关注。由于高温实验环境营造困难, 诸多因素影响高温性能评价, 目前的实验研究仍面临极大挑战。与此同时, 科研工作者们在理论研究方面取得了系列进展: 针对陶瓷材料建立了高温机械性能理论表征模型[1,2,3], 发展了预测HfB2、TiC和ZrB2陶瓷高温断裂强度的理论模型[4], 提出了预测YAG透明陶瓷高温断裂韧性的新方法[5]。然而, 这些模型中材料的热物性参数大多难以准确获取。因此, 需要发展更具普适性的理论方法对陶瓷材料的高温热机械性能进行表征。

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    Mingxing FENG, Bin WANG, Pengyu XU, Bingtian TU, Hao WANG. Predicting Thermomechanical Properties of MgAl2O4 Transparent Ceramic Based on Bond Valence Models [J]. Journal of Inorganic Materials, 2021, 36(10): 1067
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    Received: Jan. 18, 2021
    Accepted: --
    Published Online: Nov. 26, 2021
    The Author Email: WANG Hao (shswangh@whut.edu.cn)