Water Vapor Effects on the CMAS Degradation of Thermal Barrier Coatings

被引：0
作者：
B. S. Lutz
R. W. Jackson
N. M. Abdul-Jabbar
V. K. Tolpygo
C. G. Levi
机构：
[1] University of California,Materials Department
[2] Santa Barbara,undefined
[3] Honeywell Aerospace,undefined
来源：
Oxidation of Metals | 2017年 / 88卷
关键词：
Thermal barrier coatings; CMAS; Thermally grown oxide; Spinel;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A new damage mechanism of CMAS degradation of TBCs involving delamination through the thermally grown oxide (TGO) has been observed on burner rig tests of EB-PVD thermal barrier coatings. This mechanism operates in the absence of CMAS melting and is mediated by hydroxylation and volatilization of the constituent CMAS hydroxides, followed by vapor transport to the vicinity of the TGO through the TBC porosity. Analyses reveal the formation of spinel (MgAl2O4) and anorthite (CaAl2Si2O8) at the TGO/TBC interface, with concomitant evolution of porosity at the spinel/alumina interface. Tests were conducted in a controlled atmosphere tube furnace to validate the hypothesis and assess the factors that affect the evolution of the deleterious oxides. The microstructure of the reaction products formed in the lab test is compared to that formed in the burner rig.
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页码：73 / 85
页数：12
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