| Failure of EB-PVD Thermal Barrier Coatings Subjected to Thermo-Mechanical Loading |
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| 作者姓名： | CHEN Chen ZHANG Chun-xia GUO Hong-bo GONG Sheng-kai* ZHANG Yue School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing China |
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| 作者单位： | CHEN Chen，ZHANG Chun-xia，GUO Hong-bo，GONG Sheng-kai*，ZHANG Yue School of Materials Science and Engineering，Beijing University of Aeronautics and Astronautics，Beijing 100083，China |
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| 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.
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Failure of EB-PVD Thermal Barrier Coatings Subjected to Thermo-Mechanical Loading |
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| CHEN Chen,ZHANG Chun-xia,GUO Hong-bo,GONG Sheng-kai*,ZHANG Yue School of Materials Science and Engineering,Beijing University of Aeronautics and Astronautics,Beijing ,China.Failure of EB-PVD Thermal Barrier Coatings Subjected to Thermo-Mechanical Loading[J].Chinese Journal of Aeronautics,2006,19(Z1). |
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| Authors: | CHEN Chen ZHANG Chun-xia GUO Hong-bo GONG Sheng-kai ZHANG Yue |
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| Abstract: | 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. |
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| Keywords: | electron beam-physical vapor deposition (EB-PVD) thermal barrier coatings (TBCs) thermal-mechanical loading impedance spectroscopy failure |
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