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Effect of supersonic fine particles bombarding bond coat on oxidation resistance of thermal barrier coating



Author(s)

DONG Yun¹, LIU Chun-yang¹, LIN Xiao-ping¹, WANG Tie-bao¹, ZHANG Li-juan¹, WANG Zhi-ping²

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DOI:10.17265/2161-6213/2009.03.008

1. School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China;
2. College of Science, Civil Aviation University of China, Tianjin 300300, China

Thermal barrier coating (TBC) obtained on GH99 high-temperature alloy by APS, NiCoCrAlY bond coat was treated by supersonic fine particles bombarding. The microstructure and oxidation behavior of TBC were characterized by transmission electron microscope, scanning electron microscope equipped with energy dispersive spectroscopy (EDS). As shown in the results: After disposed on bond coat by supersonic fine particles bombarding, plastic deformation and large quantities of dislocation obtained on the top of bond coat. The dislocations accelerate the diffusion of atoms to the BC/TC interface. A continuous Al₂O₃ layer forms on the interface quickly. High temperature oxidation resistance of TBC could be improved.

thermal barrier coating; supersonic fine particles bombarding; high temperature oxidation resistance