Static oxidation behavior at high temperature of laser-assisted thermal sprayed NiCoCrAlYTa-Cr2O3-Cu-Mo coating

doi:10.13251/j.issn.0254-6051.2023.02.039

Abstract

Abstract: NiCoCrAlYTa-Cr₂O₃-Cu-Mo high temperature lubrication wear-resistant coating was prepared on the GH4065A nickel-based superalloy by laser-assisted plasma spraying (LPHS) technology, and then the high temperature oxidation resistance of the coating at 850-1000 ℃ for 220 h was investigated. The calculated oxidation activation energy is about 128.5 kJ·mol^-1, and the oxidation rate constants at 850, 900 and 1000 ℃ are 1.44×10^-2, 3.61×10^-2, 7.71×10^-2 mg²·cm^-4·h^-1, respectively. The experimental results show that after oxidation at 850 ℃ for 220 h, a continuous and dense oxide film dominated by Al₂O₃ is formed on the surface, which can prevent the further oxidation inside the coating. After oxidation at 1000 ℃ for 220 h, an oxide film consisting mainly of loose NiO and supplemented by dense Cr₂O₃·NiO is formed on the surface. The formation of dense oxide film prevents further oxidation of both the coating and the GH4065A superalloy substrate.

Key words: laser-assisted thermal spraying, high temperature lubrication wear resistant coating, high temperature oxidation, oxidation rate constant

CLC Number:

TG174.4

Nie Zixing, Wang Changliang, Zhang Ang, Zhang Mei, Guo Mengqiu, Tian Haoliang, Cui Yongjing, Wang Tianying. Static oxidation behavior at high temperature of laser-assisted thermal sprayed NiCoCrAlYTa-Cr₂O₃-Cu-Mo coating[J]. Heat Treatment of Metals, 2023, 48(2): 247-255.

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Static oxidation behavior at high temperature of laser-assisted thermal sprayed NiCoCrAlYTa-Cr₂O₃-Cu-Mo coating

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