Oxidation and Hot Corrosion of Gradient Thermal Barrier Coatings Prepared by EB-PVD

材料科学技术（英）, 2002, 18(1): 27-30.

^1, , ^2, , ^3,

1.School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

2.School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

3.School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

基金项目: the Doctoral Program of Higher Educa-tion of China (SRFDP)(2000000612) This research is sponsored by the National Natural Science Foundation of China (NSFC) under(59772028)

Oxidation and Hot Corrosion of Gradient Thermal Barrier Coatings Prepared by EB-PVD

Keywords： Gradient thermal barrier coating (GTBC)

The performances of gradient thermal barrier coatings (GTBCs) produced by EB-PVD were evaluated by isothermaloxidation and cyclic hot corrosion (HTHC) tests. Compared with conventional two-layered TBCs, the GTBCs exhibitebetter resistance to not only oxidation but also hot-corrosion. A dense Al2O3 layer in the GTBCs effectively prohibitesinward diffusion of O and S and outward diffusion of Al and Cr during the tests. On the other hand, an "inlaid"interface, resulting from oxidation of the Al along the columnar grains of the bond coat, enhances the adherence ofAl2O3 layer. Failure of the GTBC finally occurred by cracking at the interface between the bond coat and Al2O3layer, due to the combined effect of sulfidation of the bond coat and thermal cycling.

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Oxidation and Hot Corrosion of Gradient Thermal Barrier Coatings Prepared by EB-PVD

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