Effect of Pre-oxidation Vacuum Degree on the High Temperature Oxidation Behavior of Cold Sprayed CoNiCrAlY Coatings
ZHANG Linwei1,*, YU Jiuming1, NING Xianjin2, WANG Quansheng2
1 Institute of Applied Physics, Jiangxi Academy of Science, Nanchang 330029, China 2 School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Abstract: ACoNiCrAlY coating was prepared by cold spray and pre-oxidized in a vacuum environment under different vacuum degree. The effect of vacuum degree of pre-oxidation on the oxidation behavior of CoNiCrAlY coatings at 1 050 ℃ was studied by XRD, SEM and EDS. The results show that the as-sprayed coating presents a dense structure with low porosity (less than 0.36vol%) and low oxygen content (0.12wt%). Vacuum heat treatment improves the density of as-sprayed coating, converts the single-phase (γ) as-sprayed coating to a two-phase γ-Matrix/β-(Ni, Co)Al microstructure, and forms a continuous, dense and single α-Al2O3 layer. During the course of oxidation, the growth rate of TGO formed on CoNiCrAlY coating decreases with the decrease of vacuum degree. When the vacuum degree is less than or equal to 10-3 Pa, vacuum degree has little influence on the growth rate of TGO. An Al2O3 layer with larger grain size and less defect is formed on the surface of pre-oxidized coating during the oxidation process, which can decrease the diffusion area for Al and O. As a result, the growth rate of Al2O3 decreases and thus the formation of spinel oxide is suppressed. It is concluded that the oxidation resistance of cold-sprayed CoNiCrAlY coating has been greatly improved by vacuum pre-oxidation treatment.
张林伟, 余玖明, 宁先进, 王全胜. 预氧化真空度对冷喷涂CoNiCrAlY涂层高温氧化行为的影响[J]. 材料导报, 2022, 36(17): 21030092-5.
ZHANG Linwei, YU Jiuming, NING Xianjin, WANG Quansheng. Effect of Pre-oxidation Vacuum Degree on the High Temperature Oxidation Behavior of Cold Sprayed CoNiCrAlY Coatings. Materials Reports, 2022, 36(17): 21030092-5.
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2022, Vol. 36 
