Evolution of thermal properties of EB-PVD 7YSZ thermal barrier coatings with thermal cycling

被引:64
作者
Kakuda, Tyler R. [2 ]
Limarga, Andi M. [1 ]
Bennett, Ted D. [2 ]
Clarke, David R. [1 ,2 ]
机构
[1] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA
[2] Univ Calif Santa Barbara, Dept Mech Engn, Santa Barbara, CA 93106 USA
关键词
Thermal barrier coating; Thermal properties; Thermal cycling; HEAT-TREATMENT; CONDUCTIVITY; ZIRCONIA; POROSITY;
D O I
10.1016/j.actamat.2009.02.019
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
During high-temperature exposure, the microstructure of thermal barrier coating evolves, leading to increased thermal conductivity. We describe the evolution in the thermal properties of a 7 wt.% Y2O3 stabilized ZrO2 electron beam-physical vapor deposited (EB-PVD) thermal barrier coating with thermal cycling between room temperature and 1150 degrees C until failure. The thermal diffusivity and conductivity of the coating were evaluated non-destructively based on the analysis of its photothermal infrared emission. Although the coating density does not increase significantly with thermal cycling, the thermal diffusivity and conductivity of the coating increased substantially, particularly during the first 20 1 h cycles. The values then approach a limiting value. Complementary Raman spectroscopy suggests that the increase is accompanied by a reduction in the defect concentration in the coating and that there is also a correlation between the width of the Raman lines and the thermal conductivity. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:2583 / 2591
页数:9
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