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Y_4Si_2O_7N_2: A New Oxynitride with Low Thermal Conductivity

机译:Y_4Si_2O_7N_2:一种低导热率的新型氧氮化物

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摘要

Search for new thermal barrier materials with high-temperature stability is very difficult because there are intractable choices among thousands of possible candidates. The present paper shows that identifying and developing new low thermal conductivity materials can be accomplished by first-principles calculations of equilibrium crystal structure and elasticity, and thereafter making theoretical prediction of minimum high-temperature lattice thermal conductivity basing on David Clarke's method for insulating materials. We highlight a new oxynitride ceramic, Y_4Si_2O_7N_2, with a low theoretical minimum thermal conductivity of 1.12 W m~(-1) K~(-1). The theoretical result is further validated by experimental measurement of thermal conductivity of dense and bulk Y_4Si_2O_7N_2. The experimental thermal conductivity is 1.50 W m~(-1) K~(-1) at 1300 K. Furthermore, thermal properties of Y_4Si_2O_7N_2 are investigated for evaluating its potential performances.
机译:寻找具有高温稳定性的新型隔热材料非常困难,因为在成千上万的候选材料中有许多难以选择的选择。本文表明,可以通过平衡晶体结构和弹性的第一性原理计算,然后基于戴维·克拉克(David Clarke)的绝缘材料方法对最小高温晶格导热率进行理论预测,从而完成识别和开发新型低导热率材料的工作。我们重点介绍了一种新型的氧氮化物陶瓷Y_4Si_2O_7N_2,其理论最低最小导热率为1.12 W m〜(-1)K〜(-1)。通过实测和实测Y_4Si_2O_7N_2的热导率进一步验证了理论结果。在1300 K下的实验热导率为1.50 W m〜(-1)K〜(-1)。此外,还研究了Y_4Si_2O_7N_2的热性能,以评估其潜在性能。

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  • 来源
    《Journal of the American Ceramic Society》 |2012年第10期|p.3278-3284|共7页
  • 作者单位

    High-performance Ceramics Division, Shenyang National Laboratory for Materials Science. Institute of Metal Research. Chinese Academy of Sciences, Shenyang 110016, China,Graduate School of Chinese Academy of Sciences. Beijing 100039. China;

    High-performance Ceramics Division, Shenyang National Laboratory for Materials Science. Institute of Metal Research. Chinese Academy of Sciences, Shenyang 110016, China;

    High-performance Ceramics Division, Shenyang National Laboratory for Materials Science. Institute of Metal Research. Chinese Academy of Sciences, Shenyang 110016, China,Graduate School of Chinese Academy of Sciences. Beijing 100039. China;

    High-performance Ceramics Division, Shenyang National Laboratory for Materials Science. Institute of Metal Research. Chinese Academy of Sciences, Shenyang 110016, China;

    Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China;

    Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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  • 入库时间 2022-08-17 13:38:59

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