无机材料学报 ›› 2021, Vol. 36 ›› Issue (10): 1067-1073.DOI: 10.15541/jim20210034 CSTR: 32189.14.10.15541/jim20210034

• 研究论文 • 上一篇    下一篇

基于键价模型的MgAl2O4透明陶瓷热机械性能预测

冯明星(), 王斌, 徐鹏宇, 涂兵田, 王皓()   

  1. 武汉理工大学 材料复合新技术国家重点实验室, 武汉 430070
  • 收稿日期:2021-01-18 修回日期:2021-03-08 出版日期:2021-10-20 网络出版日期:2021-04-05
  • 通讯作者: 王 皓, 教授. E-mail: shswangh@whut.edu.cn
  • 作者简介:冯明星(1996-), 男, 硕士研究生. E-mail: 15200227687@163.com
  • 基金资助:
    国家重点研发计划(2017YFB0310500);国家自然科学基金(51472195);国家自然科学基金(51502219)

Predicting Thermomechanical Properties of MgAl2O4 Transparent Ceramic Based on Bond Valence Models

FENG Mingxing(), WANG Bin, XU Pengyu, TU Bingtian, WANG Hao()   

  1. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
  • Received:2021-01-18 Revised:2021-03-08 Published:2021-10-20 Online:2021-04-05
  • Contact: WANG Hao, professor. E-mail: shswangh@whut.edu.cn
  • About author:FENG Mingxing(1996-), male, Master candidate. E-mail: 15200227687@163.com
  • Supported by:
    National Key Research and Development Program of China(2017YFB0310500);National Natural Science Foundation of China(51472195);National Natural Science Foundation of China(51502219)

摘要:

尖晶石型陶瓷具有优异的热机械性能, 在高温结构材料领域具有良好的应用前景。本研究将键价模型与高温机械性能理论表征模型相结合, 建立了从变温晶体结构出发预测尖晶石型陶瓷高温热机械性能的方法, 阐明了晶体结构与高温热机械性能之间的关系。采用该方法预测了MgAl2O4透明陶瓷的高温断裂强度和断裂韧性, 其预测结果与实验值吻合。研究表明, MgAl2O4中阳离子反位率、化学键硬度和体模量随温度的变化在800 ℃上下存在显著差异, 然而由于配位多面体的耦合作用, 阳离子反位的温度效应不会显著影响MgAl2O4透明陶瓷的高温热机械性能。

关键词: 尖晶石型陶瓷, MgAl2O4, 透明陶瓷, 键价模型, 热机械性能, 理论表征模型

Abstract:

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.

Key words: spinel-type ceramics, magnesium aluminate, transparent ceramic, bond valence models, thermomechanical property, theoretical characterization model

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