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Effects of Nb5+ doping on thermal properties of Gd2(Zr1−xNbx)2O7+x ceramics
Advances in Applied Ceramics ( IF 1.3 ) Pub Date : 2020-04-23 , DOI: 10.1080/17436753.2020.1755509
Tao Jiang 1 , Min Xie 1 , Xuanli Wang 1 , Xiwen Song 1
Affiliation  

ABSTRACT Pyrochlore Gd2(Zr1−xNbx)2O7+x (x = 0, 0.05, 0.1, 0.15) ceramic materials were synthesised using a high-temperature solid-state reaction method. The phase structure, thermal expansion coefficient and thermal conductivity of Gd2(Zr1−xNbx)2O7+x were investigated in this work. The results show that with the introduction of Nb2O5, Gd2(Zr1−xNbx)2O7+x ceramic materials present a cubic pyrochlore structure. Meanwhile, Gd2(Zr1−xNbx)2O7+x ceramics have clear grain boundaries. The thermal expansion coefficient of Gd2(Zr1−xNbx)2O7+x ceramic materials reduces from 11.4576 × 10−6 to 10.7919 × 10−6 K−1 (larger than 10 × 10−6 K−1), while its thermal conductivity gradually increases with the doping of Nb5+ ions. Considering their comprehensive properties, Gd2(Zr1−xNbx)2O7+x compounds may be considered as promising thermal barrier coatings materials.

中文翻译:

Nb5+掺杂对Gd2(Zr1−xNbx)2O7+x陶瓷热性能的影响

摘要 烧绿石 Gd2(Zr1−xNbx)2O7+x (x = 0, 0.05, 0.1, 0.15) 陶瓷材料是使用高温固相反应方法合成的。本文研究了 Gd2(Zr1−xNbx)2O7+x 的相结构、热膨胀系数和热导率。结果表明,随着Nb2O5的引入,Gd2(Zr1−xNbx)2O7+x陶瓷材料呈现立方烧绿石结构。同时,Gd2(Zr1−xNbx)2O7+x 陶瓷具有清晰的晶界。Gd2(Zr1−xNbx)2O7+x 陶瓷材料的热膨胀系数从 11.4576 × 10−6 降低到 10.7919 × 10−6 K−1(大于 10 × 10−6 K−1),而其热导率逐渐降低随着 Nb5+ 离子的掺杂而增加。考虑到它们的综合性能,Gd2(Zr1−xNbx)2O7+x 化合物可以被认为是有前途的热障涂层材料。
更新日期:2020-04-23
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