真空预氧化对冷喷涂CoNiCrAlY涂层组织及热腐蚀性能的影响

doi:10.3969/j.issn.1001-4381.2013.04.003

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Abstract CoNiCrAlY coatings were prepared by cold spray process. After deposition, the pre-oxidation of the coating was performed by vacuum heat-treatment. The microstructure and phase constituent of coating were characterized by XRD, FE-SEM and TEM. The corrosion behavior and mechanisms of as-sprayed and pre-oxidized coatings in molten 75%Na₂SO₄+25%NaCl (mass fraction, the same below) at 900℃ were also studied. The results show that the as-sprayed coating presents a nanocrystalline structure with low porosity (less than 0.28% volume fraction) and low oxygen content (0.12%). Vacuum pre-oxidation treatment improves the bonding status of particle interface and forms a continuous, uniform and dense α-Al₂O₃ layer, with an average thickness of 0.26μm. As-sprayed and pre-oxidized coatings can protect the substrate from hot corrosion due to the formation of the continuous and dense α-Al₂O₃ layer. Moreover, the vacuum pre-oxidation treatment can alleviate the diffusion of S and Cl into coating and thus lead to an increase of one time in the hot corrosion resistance than the as-sprayed coatings.

Key words： MCrAlY coating nanocrystalline hot corrosion cold spray vacuum pre-oxidation

Received: 03 June 2012 Published: 20 April 2013

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TG174.422

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	ZHANG Lin-wei
	WANG Lu
	WANG Quan-sheng
	NING Xian-jin

Cite this article:

ZHANG Lin-wei,WANG Lu,WANG Quan-sheng, et al. Effect of Vacuum Pre-oxidation on Microstructure and Hot Corrosion Behavior of CoNiCrAlY Coating Prepared by Cold Spray[J]. Journal of Materials Engineering, 2013, 0(4): 12-16.

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http://jme.biam.ac.cn/EN/10.3969/j.issn.1001-4381.2013.04.003 OR http://jme.biam.ac.cn/EN/Y2013/V0/I4/12

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