Degradation of thermal barrier coatings due to thermal cycling up to 1150°C

被引：43

作者：

Ali, MS ^{[1
]}

Song, SH ^{[1
]}

Xiao, P ^{[1
]}

机构：

[1] Brunel Univ, Dept Mech Engn, Mat Grp, Uxbridge UB8 3PH, Middx, England

来源：

JOURNAL OF MATERIALS SCIENCE | 2002年 / 37卷 / 10期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1023/A:1015245920054

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The degradation of thermal barrier coatings (TBCs) due to thermal cycling up to 1150degreesC has been studied. During thermal cycling, the bond coat in the TBCs was oxidised to form an alumina and a mixed oxide layer between the top coat of yttria stabilised zirconia (YSZ) and the bond coat of MCrAlY alloy. The mixed oxide layer mainly consists of alpha-Cr2O3 and (Ni,Co)(Cr,Al)(2)O-4 spinel phases, which are formed above the alpha-alumina layer. Interestingly, the alumina layer gradually disappeared during the oxidation while the content of chromium in the mixed oxide increased with increasing oxidation time. As the oxidation accelerated after the disappearance of the alumina layer, cracks initiated and propagated in the mixed oxide layer near the YSZ. Eventually, the crack propagation induced the spallation of some YSZ top coatings after the 2000 h oxidation. (C) 2002 Kluwer Academic Publishers.

引用

页码：2097 / 2102

页数：6

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