Preparation mechanism and tribological performance of Ni-base composite coating on aluminum alloy surface

Abstract

Abstract: To improve the surface wear resistance of aluminum alloy in the application, Ni-Al and three different Ni-Al-W composite coatings were prepared on the surface of aluminum alloy by mechanical milling method. The study showed that the inner tissues of the four composite coatings are evenly distributed with a thickness of about 50 μm to 100 μm. With the increase of W content, the ductile deformation surface of the particle gradually decreases. After heat treatment, Al₃Ni and Al₃Ni₂ intermetallic compounds are generated in the Ni-Al compound coating, but only Al₃Ni₂ is produced in the remaining powder, and no fine powder remain. AlNi and Al₃Ni₂ are generated in the three Ni-Al-W composite coatings and coarse powder, and the Al₃Ni₂ intermetallic compounds in the fine powder gradually disappear with increasing W content. The microhardness of the composite coating increase with increasing W content, the friction coefficient of the three coatings is slightly higher than that of the aluminum alloy matrix and Ni-Al composite coating, between 0.6 and 0.75, however, its wear rate is much lower than that of matrix aluminum alloy and Ni-Al composite coating, about 0.2×10^-3~0.4×10^-3 mm³/(N·m), and slightly reduce with the increase of W content. The preparation of Ni-Al-W composite coating on aluminum alloy surface effectively improves the wear resistance of aluminum alloy surface.

Key words: aluminum alloy, composite powder, mechanical ball mill, intermetallic compound, wear resistance

CLC Number:

TG495

YAN Cheng-qi, JIA Zhu-ying, LI Zhan-jun. Preparation mechanism and tribological performance of Ni-base composite coating on aluminum alloy surface[J]. Journal of Lanzhou University of Technology, 2023, 49(3): 15-22.

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