Effect of Surface Modification of Bonding Layers by High Current Pulsed Electron Beam on Thermal Shock Failure and Residual Stress of Thermal Barrier Coatings
HAN Zhiyong, QIU Zhenzhen, SHI Wenxin
Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin 300300
Abstract: Thermal sprayed CoCrAlY layer was prepared by air plasma spray on the surface of Ni-based superalloy GH4169. Nano Al film was deposited on the surface of CoCrAlY by electron beam evaporation and then its surface was modified by high current pulsed electron beam. Finally, the modified thermal barrier coating was prepared by depositing ceramic layer on the CoCrAlY surface by APS. The thermal shock test, bonding strength test and residual stress analysis were conducted on the coatings after bon-ding layer surface modification by Al deposition and the ordinary coatings. The results indicated that the modified coatings present better thermal shock resistance than that of the ordinary coatings after 1 050 ℃heating and then 10 ℃ water quenching. The residual stress produced by the thermally grown oxide (TGO) of modified coatings and ordinary coatings in the process of thermal shock were both press stress, and the residual press stress increased with the increasing thermal shock cycles. In addition, the growth rate of residual press stress in TGO of modified coatings was lower than that of the ordinary coatings. The tensile test result showed that the fracture of the ordinary coating belonged to mixed fracture, while the fracture of the modified coating occurred in the interface between the ceramic layer and the film adhesive, and the interlaminar fracture was not found. The modified coatings exhibited more favorable bonding strength than ordinary coating. In conclusion, the service life of thermal barrier coatings in cold and thermal cycles can be dramatically prolonged by combined surface modification of molten Al film in the bonding layer through electric beam vacuum deposition and high current pulsed electron beam technology.
韩志勇, 丘珍珍, 史文新. 强流脉冲电子束粘结层表面改性对热障涂层热震及残余应力的影响[J]. 材料导报, 2018, 32(24): 4303-4308.
HAN Zhiyong, QIU Zhenzhen, SHI Wenxin. Effect of Surface Modification of Bonding Layers by High Current Pulsed Electron Beam on Thermal Shock Failure and Residual Stress of Thermal Barrier Coatings. Materials Reports, 2018, 32(24): 4303-4308.
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2018, Vol. 32 
