Effects of Shot Peening Process on Thermal Cycling Lifetime of TBCs Prepared by EB-PVD  

作　　者：ZHOU Zhao-hui GONG Sheng-kai LI He-fei XU Hui-bin ZHANG Chun-gang WANG Lu 

机构地区：[1]School of Materials Science and Engineering, Beij＇ing University of Aeronautics and Astronautics, Beij＇ing 100083, China [2]Shenyang Liming.4ero-Engine Group Corporation, Shenyang 110043, China

出　　处：《Chinese Journal of Aeronautics》2007年第2期145-147,共3页中国航空学报（英文版）

基　　金：National Natural Science Foundation of China (50571005; 50420130032)

摘　　要：Conventional two-layered thermal barrier coatings （TBCs） are prepared by electron beam physical vapor deposition （EB-PVD） with ZrO2-8 wt% Y2O3 （8YSZ） as top coat and CoCrAlY as bond coat on disk-shaped Ni based super-alloy. In this paper, three kinds of shot peening process with different lengths of operating time were adopted for bond coating. As a result, changes took place in its surface roughness and the surface micro-hardness. A thermal cycling test at 1 273 Kx55 rain and another at room temperature for 5 min were performed to study the effects of shot peening process on the thermal cycling lifetime of TBCs. It is found that a moderate shot peening process will be able to prolong the life time. The oxidation dynamic of the as-processed TBCs basically accords with the parabolic rule, and the oxidation test also attests to the spallation between YSZ and thermal growth oxide （TGO） responsible mainly for the failure of TBCs.Conventional two-layered thermal barrier coatings （TBCs） are prepared by electron beam physical vapor deposition （EB-PVD） with ZrO2-8 wt% Y2O3 （8YSZ） as top coat and CoCrAlY as bond coat on disk-shaped Ni based super-alloy. In this paper, three kinds of shot peening process with different lengths of operating time were adopted for bond coating. As a result, changes took place in its surface roughness and the surface micro-hardness. A thermal cycling test at 1 273 Kx55 rain and another at room temperature for 5 min were performed to study the effects of shot peening process on the thermal cycling lifetime of TBCs. It is found that a moderate shot peening process will be able to prolong the life time. The oxidation dynamic of the as-processed TBCs basically accords with the parabolic rule, and the oxidation test also attests to the spallation between YSZ and thermal growth oxide （TGO） responsible mainly for the failure of TBCs.

关 键 词：thermal cycling lifetime shot peening thermal barrier coatings （TBCs） 

分 类 号：V21[航空宇航科学与技术—航空宇航推进理论与工程]