Oxidation and thermal fatigue of EB-PVD thermal barrier coatings on tube superalloy substrate

来源期刊:中国有色金属学报(英文版)2006年第z2期

论文作者:GAO Yu-lai ZHANG Chun-xia ZHOU Chun-gen GONG Sheng-kai XU Hui-bin

文章页码:10 - 13

Key words:thermal barrier coatings; electron beam physical vapor deposition; oxidation; thermal shock

Abstract: Two-layer structure thermal barrier coatings (TBCs) (NiCoCrAlY (bond coat)+(6%?8%, mass fraction) Y2O3-stabilized ZrO2(YSZ top coat)) were deposited by electron beam physical vapor deposition (EB-PVD) on tube superalloy substrates. The samples were investigated by isothermal oxidation and thermal shock tests. It is found that the mass gains of the substrate with and without TBCs are 0.165 and 7.34 mg/cm2, respectively. So the TBCs system is a suitable protection for the substrate. In thermal shock tests the vertical cracks initiate at the top coat and grow into the bond coat, causing the oxidation of the bond coat along the cracks. Failure of the TBCs system occurs by the spallation of the YSZ from the bond coat, and some micro-cracks are found at the location where the fragment of the YSZ top coat spalled from.

基金信息:the National Natural Science Foundation of China

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