Thermal and mechanical properties of Ta2O5 doped La2Ce2O7 thermal barrier coatings prepared by atmospheric plasma spraying

被引：59

作者：

Zhang, Hao ^{[1
,2
]}

Su, Junbin ^{[3
]}

Duo, Shuwang ^{[2
]}

Zhou, Xin ^{[1
]}

Yuan, Jieyan ^{[1
]}

Dong, Shujuan ^{[1
]}

Yang, Xiong ^{[1
]}

Zeng, Jinyan ^{[1
]}

Jiang, Jianing ^{[1
]}

Deng, Longhui ^{[1
]}

Cao, Xueqiang ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China

[2] Jiangxi Sci & Technol Normal Univ, Jiangxi Key Lab Surface Engn, Nanchang 330013, Jiangxi, Peoples R China

[3] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2019年 / 39卷 / 07期

基金：

中国国家自然科学基金;

关键词：

La2Ce2O7; Ta2O5; doping; Thermal conductivity; Failure mechanism; LANTHANUM-CERIUM OXIDE; CYCLING BEHAVIOR; EXPANSION COEFFICIENTS; PHASE-STABILITY; CONDUCTIVITY; MICROSTRUCTURE; PERFORMANCE; RESISTANCE; CERAMICS; SYSTEM;

D O I：

10.1016/j.jeurceramsoc.2019.02.041

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：

La2Ce2O7 (LC) is a new promising thermal barrier coating (TBC) material for high-temperature applications. However, the sudden decrease of thermal expansion coefficient (TEC) at similar to 623 K limits its application. In this study, the plasma-sprayed La2Ce1.7Ta0.3O7.15 (LCT) coating was developed by partial substitution of Ce4+ in LC with Ta5+. LCT coating shows lower thermal conductivity between 298 K and 1273 K (0.54-0.71 W/(m.K)) than LC coating (0.65-0.85 W/(m.K)) and the traditional yttria partially stabilized zirconia (YSZ) coating (1.53-1.72 W/(m.K)). It also exhibits excellent thermal stability at least up to 1573 K for 1000 h. What is more, the sudden TEC drop is suppressed owing to the reduced oxygen vacancy concentration governed by Ta5+ -substitution content. As a result, LCT TBC shows an improved thermal cycling lifetime in an air furnace as compared to LC TBC.

引用

页码：2379 / 2388

页数：10

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