Failure of EB-PVD Thermal Barrier Coatings Subjected to Thermo-Mechanical Loading  

作　　者：CHEN Chen ZHANG Chun-xia GUO Hong-bo GONG Sheng-kai ZHANG Yue 

机构地区：[1]School of Materials Science and Engineering, Beij＇ing University of Aeronautics and Astronautics, Beijing 100083, China

出　　处：《Chinese Journal of Aeronautics》2006年第B12期82-85,共4页中国航空学报（英文版）

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

摘　　要：Thermal barrier coatings （TBCs） were developed to protect metallic blades and vanes working in turbo-engines. The two-layered structure TBCs, consisting of NiCoCrAlY bond coat and yttria stabilized zirconia （YSZ）, were deposited on a cylinder of superalloy substrate by the electron beam-physical vapor deposition （EB-PVD）. The failure mechanism of the TBCs was investigated with a thermo-mechanical fatigue testing system under the service condition similar to that for turbine blades. Non-destructive evaluation of the coated specimens was conducted through the impedance spectroscopy. It is found that the crack initiation mainly takes place on the top coat at the edge of the heated zones.Thermal barrier coatings （TBCs） were developed to protect metallic blades and vanes working in turbo-engines. The two-layered structure TBCs, consisting of NiCoCrAlY bond coat and yttria stabilized zirconia （YSZ）, were deposited on a cylinder of superalloy substrate by the electron beam-physical vapor deposition （EB-PVD）. The failure mechanism of the TBCs was investigated with a thermo-mechanical fatigue testing system under the service condition similar to that for turbine blades. Non-destructive evaluation of the coated specimens was conducted through the impedance spectroscopy. It is found that the crack initiation mainly takes place on the top coat at the edge of the heated zones.

关 键 词：electron beam-physical vapor deposition （EB-PVD） thermal barrier coatings （TBCs） thermal-mechanical loading impedance spectroscopy FAILURE 

分 类 号：V261.933[航空宇航科学与技术—航空宇航制造工程] TG174.444[金属学及工艺—金属表面处理]