Effect of graphene on friction properties of miro-arc oxidation films produced on ZL109 aluminum alloy piston

doi:10.13251/j.issn.0254-6051.2020.02.045

Abstract

Abstract:

Graphene composite ceramic film was prepared on the surface of ZL109 aluminum alloy by micro arc oxidation with different concentration of graphene additive in the electrolyte. The film was tested by thickness gauge and hardness tester. Then, the friction and wear tests were carried out on the optimized concentration treated samples, and the friction coefficient and surface morphology were analyzed to evaluate the friction performance of the composite ceramic film prepared by micro arc oxidation with graphene additive and its action mechanism. The results show that the graphene additive makes the micro-arc oxidation film layer have better surface properties, anti-wear and friction reducing properties. When the concentration is 6 g/L, the film thickness reaches 29.68 μm, the hardness reaches 990.12 HV0.3, and the friction coefficient is stable at 0.19. The friction coefficient is significantly lower than that of ordinary ceramic coatings, up to 34.48%. During the friction process, graphene fills the grooves and scratches on the surface of the friction pair, and the surface honing is finer. At the same time, the composite additive forms a carbon film during the friction process, which plays a self-repairing role.

Key words: composite ceramic film, grapnene, anti-wear and friction reducing, friction coefficient

CLC Number:

TH117.1

Hu Haifeng, Li Xiao, Wang Lianhai, Ma Qiang, Liu Xinjian. Effect of graphene on friction properties of miro-arc oxidation films produced on ZL109 aluminum alloy piston[J]. HTM, 2020, 45(2): 231-234.

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