Thermophysical properties of Yb2O3 doped Gd2Zr2O7 and thermal cycling durability of (Gd0.9Yb0.1)2Zr2O7/YSZ thermal barrier coatings

被引：153
作者：
Guo, Lei [1 ,2 ]
Guo, Hongbo [1 ,2 ]
Peng, Hui [1 ,2 ]
Gong, Shengkai [1 ,2 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Beijing, Peoples R China
[2] Beihang Univ, Beijing Key Lab Adv Funct Mat & Thin Film Technol, Beijing 100191, Peoples R China
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2014年 / 34卷 / 05期
关键词：
(Gd1-xYbx)(2)Zr2O7; Thermophysical properties; Electron beam physical vapor deposition (EB-PVD); Thermal barrier coatings (TBCs); Thermal cycling; MECHANICAL-PROPERTIES; PHASE-STABILITY; CONDUCTIVITY; SYSTEMS; OXIDE; LA-2(ZR0.7CE0.3)(2)O-7; BEHAVIOR; HARDNESS; MODULUS; SURFACE;
D O I：
10.1016/j.jeurceramsoc.2013.11.035
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：
(Gd1-xYbx)(2)Zr2O7 compounds were synthesized by solid reaction. Yb2O3 doped Gd2Zr2O7 exhibited lower thermal conductivities and higher thermal expansion coefficients (TECs) than Gd2Zr2O7. The TECs of (Gd1-xYbx)(2)Zr2O7 ceramics increased with increasing Yb2O3 contents. (Gd0.9Yb0.1)(2)Zr2O7 (GYbZ) ceramic exhibited the lowest thermal conductivity among all the ceramics studied, within the range of 0.8-1.1 W/mK (20-1600 degrees C). The Young's modulus of GYbZ bulk is 265.6 +/- 11 GPa. GYbZ/YSZ double-ceramic-layer thermal barrier coatings (TBCs) were prepared by electron beam physical vapor deposition (EB-PVD). The coatings had an average life of more than 3700 cycles during flame shock test with a coating surface temperature of similar to 1350 degrees C. Spallation failure of the TBC occurred by delamination cracking within GYbZ layer, which was a result of high temperature gradient in the GYbZ layer and low fracture toughness of GYbZ material. (C) 2013 Elsevier Ltd. All rights reserved.
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页码：1255 / 1263
页数：9
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