Thermal and mechanical properties of ferroelastic RENbO4 (RE = Nd, Sm, Gd, Dy, Er, Yb) for thermal barrier coatings

被引：55
|
作者：
Zhang, Peng [1 ]
Feng, Yingjie [1 ]
Li, Yi [1 ]
Pan, Wei [1 ]
Zong, Peng-an [1 ]
Huang, Muzhang [1 ]
Han, Yi [1 ]
Yang, Zesheng [1 ]
Chen, Hao [1 ]
Gong, Qianming [1 ]
Wan, Chunlei [1 ]
机构：
[1] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
来源：
SCRIPTA MATERIALIA | 2020年 / 180卷
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Rare earth niobates; Ferroelastic domain; Thermal properties; Fracture toughness; CONDUCTIVITY; ZIRCONATE; MICROSTRUCTURE; EXPANSION; EU;
D O I：
10.1016/j.scriptamat.2020.01.026
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A new series of rare-earth niobates (RENbO4) are synthesized and investigated for potential thermal barrier coating (TBC) application. The thermal conductivities of RENbO4 are much lower than yttria stabilized zirconia (YSZ) mainly due to the chemical inhomogeneity. The lattice distortion contributes to the higher coefficients of thermal expansion (CTEs, 12.8 x 10(-6) K-1) of RENbO4 below the critical temperature. Especially, RENbO4 exhibits high fracture toughness (1.93-2.77 MPa m(0.5)) comparable to YSZ, owning to the absorption of crack energy by the ferroelastic domain switching. The excellent thermal and mechanical properties give RENbO4 great potential as new durable TBC materials. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：51 / 56
页数：6
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