Thermal property and failure behavior of LaSmZrO thermal barrier coatings by EB-PVD

被引:34
|
作者
Shen, Zaoyu [1 ]
Liu, Guanxi [1 ]
Zhang, Rujing [1 ]
Dai, Jianwei [1 ]
He, Limin [1 ]
Mu, Rende [1 ]
机构
[1] Aero Engine Corp China, Key Lab Adv Corros & Protect Aviat Mat, Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China
基金
北京市自然科学基金;
关键词
LZC/YSZ DCL TBCS; MICROSTRUCTURE; EVOLUTION; CONDUCTIVITY; PERFORMANCE; OXIDATION; GD2ZR2O7; SCIENCE; YSZ;
D O I
10.1016/j.isci.2022.104106
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
La2Zr2O7 coatings are promising candidates to substitute YSZ coatings in advanced gas turbine engines. In this work, Sm-doped La2Zr2O7, coatings were deposited by physical vapor deposition. This work focuses on the crystal structure, thermal conductivity, thermal expansion coefficient, morphology, composition, and thermal durability of LaSmZrO coatings. The LaSmZrO ceramics exhibit low thermal conductivity (1.69 W/mK at 800 degrees C) and high thermal expansion coefficient (9.72*10(-6) K-1 at 1500 degrees C) compared with La2Zr2O7. The LaSmZrC/YSZ coatings with feathery microstructure show relatively good thermal durability (8183 cycles or 856 h) under high temperature. The broken regions are observed at the ceramic coating/bond coating interface. The failure behaviors are relevant with crack evolution and thermally grown oxide growth. This work might guide the investigation of advanced coatings under high temperature.
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页数:12
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