预氧化真空度对冷喷涂CoNiCrAlY涂层高温氧化行为的影响

doi:10.11896/cldb.21030092

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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.

Key words： CoNiCrAlY coating cold spray thermally grown oxide pre-oxidation

Published: 10 September 2022 Online: 2022-09-10

CLC number:

TG174.442

Fund:National Natural Science Foundation Youth Fund of China (51701089) and the National Natural Science Regional Foundation of China (51961015).

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	Articles by authors
	ZHANG Linwei
	YU Jiuming
	NING Xianjin
	WANG Quansheng

Cite this article:

ZHANG Linwei,YU Jiuming,NING Xianjin, et al. Effect of Pre-oxidation Vacuum Degree on the High Temperature Oxidation Behavior of Cold Sprayed CoNiCrAlY Coatings[J]. Materials Reports, 2022, 36(17): 21030092-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21030092 OR http://www.mater-rep.com/EN/Y2022/V36/I17/21030092

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