Low thermal conductivity in La2Zr2O7 pyrochlore with A-site partially substituted with equimolar Yb2O3 and Er2O3

被引：40

作者：

Zhang, Yonghe ^{[1
]}

Xie, Min ^{[1
]}

Zhou, Fen ^{[1
]}

Cui, Xiangzhong ^{[2
]}

Lei, Xingeng ^{[2
]}

Song, Xiwen ^{[1
]}

An, Shengli ^{[1
]}

机构：

[1] Inner Mongolia Univ Sci & Technol, Sch Met & Mat, Inner Mongolia Key Lab Adv Ceram & Device, Baotou 014010, Peoples R China

[2] Beijing Aeronaut Mfg Technol Res Inst, Beijing 100095, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2014年 / 40卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Thermal conductivity; (La1-2xYbxErx)(2)Zr2O7 ceramics; Pyrochlore; Thermal barrier coatings; THERMOPHYSICAL PROPERTIES; EXPANSION; OXIDES; MGO;

D O I：

10.1016/j.ceramint.2014.01.130

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

(La1-2xYbxErx)(2)Zr2O7 ceramics were synthesized using the solid state reaction method and their thermophysical properties were investigated. All (La1-2xYbxErx)(2)Zr2O7 ceramics were composed of the pure pyrochlore phase. The average thermal expansion coefficients of the (La1-2xYbxErx)(2)Zr2O7 ceramics ranged from 9.54 to 9.78 x 10(-6) K-1. The substitution of Yb3+ and Er3+ for La3+ substantially reduced the thermal conductivity of La2Zr2O7. The thermal conductivity decreased from 2.12W m-1 K-1 for the composition with x=0 to 1.27 W m(-1) K-1 for which with x=0.05 at 26 degrees C. In addition, the thermal conductivity for the composition with x= 0.05 was less sensitive to temperature variation, which ranged from 1.22 to 1.32 W m(-1) K-1 in the measuring temperature range. These results suggested promising potential applications of the (La1-2xYbxErx)(2)Zr2O7 ceramics for high temperature thermal barrier coatings. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：9151 / 9157

页数：7

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