Effect of annealing on porosity of Cr coating on zirconium alloy surface

doi:10.13251/j.issn.0254-6051.2024.01.042

Abstract

Abstract: Cr coating was prepared on Zr-4 alloy by supersonic flame spraying (high velocity oxygen fuel, HVOF), annealed at 700 ℃ for 2 h, and oxidized at 1000 ℃ in water vapor environment, and the densities of the coating were measured by a Haus balance density measurement kit to investigate the effect of annealing on the porosity of Cr coatings. The results show that annealing can significantly improve the Cr coating density and compensate for the high porosity of the coating by HVOF with the experimental process parameters. There is no significant change in the interface between the coating and the substrate. The oxidation resistance of the annealed Cr coating is better than that of the unannealed specimen. It indicates that appropriate annealing after coating preparation can enhance the oxidation resistance at high temperature by increasing the coating densities and improving the coating microstructure.

Key words: zircaloy, Cr coating, HVOF, annealing, density

CLC Number:

TG174.4

Li Zhikang, Wang Quanwei, Shen Xiaofeng, Huang Jiao, Fan Lifeng, Ma Wen, Zhang Pengxing. Effect of annealing on porosity of Cr coating on zirconium alloy surface[J]. Heat Treatment of Metals, 2024, 49(1): 262-267.

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