The evolution of oxidation stresses in zirconia thermal barrier coated superalloy leading to spalling failure

被引:120
作者
Clarke, DR [1 ]
Christensen, RJ [1 ]
Tolpygo, V [1 ]
机构
[1] Univ Calif Santa Barbara, Coll Engn, Dept Mat, Santa Barbara, CA 93106 USA
关键词
oxidation; TBC; luminescence; stresses;
D O I
10.1016/S0257-8972(97)00483-0
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The evolution of the stresses in the aluminum oxide formed beneath a zirconia thermal barrier coating during high-temperature oxidation has been measured from the piezospectroscopic shift in the R-line photoluminescence from Cr3+ impurities incorporated into the growing aluminum oxide scale. The early stages of oxidation are associated with concurrent phase transformations in the aluminum oxide leading to the stable alpha-alumina phase. On the basis of microstructural observations and the broadening of the luminescence lines, it is suggested that spalling failure occurs as a result of linking together of localized decohesion of the oxide/bond-coat interface, a process accelerated by moisture enhanced sub-critical crack growth at the interface. (C) 1997 Elsevier Science S.A.
引用
收藏
页码:89 / 93
页数:5
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