Preparation and oxidation resistance of Al-Si coating on GH738 alloy

doi:10.13251/j.issn.0254-6051.2023.03.031

Abstract

Abstract: Al-Si coating was prepared on the surface of GH738 alloy by thermal diffusion method. The morphology, thickness, phase composition and element distribution of the Al-Si coating were studied by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS); the hardness of the coating was determined by hardness tester; the static high temperature oxidation resistance test was carried out at 1200 ℃ for 100 h. The results show that the coating thickness reaches 120 μm, the coating is an obvious double-layer structure, the outer layer is Al-Si layer, and the inner layer is inter-diffusion layer; the phase composition of the coating is mainly NiAl and Ni₂Al₃ with a small amount of Cr₃Si; the hardness of the coating reaches about 900 HV0.1, which is about 3.5 times of the matrix; the oxidation kinetics curve of the coating meets the parabolic law, and the oxidation rate constant is 0.0987 mg²·cm^-4·h^-1. The high temperature oxidation resistance of the relatively dense Al₂O₃ protective film formed on the alloy surface is about 5 times higher than that of the matrix.

Key words: GH738 alloy, thermal diffusion method, Al-Si coating, high temperature oxidation resistance

CLC Number:

TB31

Guo Mengxin, Ran Xuelin, Zhang Jin. Preparation and oxidation resistance of Al-Si coating on GH738 alloy[J]. Heat Treatment of Metals, 2023, 48(3): 188-194.

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