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杨效田,付小月,冯力,安国升,李文生.真空扩散原位合成NiCoCrAlY涂层及其抗氧化性能[J].稀有金属材料与工程(英文),2020,49(5):1750~1756.[yangxiaotian,fuxiaoyue,fengli,anguosheng and liwensheng.NiCoCrAlY coating of in-situ synthesis by vacuum diffusion and its oxidation resistance[J].Rare Metal Materials and Engineering,2020,49(5):1750~1756.]
NiCoCrAlY coating of in-situ synthesis by vacuum diffusion and its oxidation resistance
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Received:March 16, 2019  Revised:May 15, 2019
Key words: Cold spraying  NiCoCrAlY alloy coating  Microstructure morphology  Element diffusion  Interface
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
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yangxiaotian,fuxiaoyue,fengli,anguosheng and liwensheng  
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      The mixture of Ni, Co, Cr, Al, Y powders were prepared by mechanically mixing method for 4 hours with the ratio of 4:2:1.5:1:0.03 of Ni, Co, Cr, Al, and Y, and the deposited mixed powder coating with a thickness of 150 μm was prepared on the 310s stainless steel substrate by using the low-pressure cold spray equipment (GDU-3-15). The sample was placed to a vacuum tube furnace (TL1700) for thermal diffusion treatment. The microstructure, phase composition and microhardness of in-situ synthesis NiCoCrAlY alloy coatings were analyzed by Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffractometry (XRD) and microhardness tester, et al. The results show that the mixed powder coating of Ni, Co, Cr, Al,Y prepared by the cold spraying is mainly constituted with simple elements. However, the diffusion reaction of the elements occurs in the coating after vacuum diffusion at 1100 ℃ for 4 h. Simultaneously, there is a diffusion phenomenon between the coating and the substrate, which forms an obvious metallurgical bond. Oxidation experiments show that the NiCoCrAlY coating of in-situ synthesis exhibited significantly lower oxidation weight gain than the pure substrate, which can protects the substrate from rapid oxidation effectively.