The influence of diamond-like carbon and anodised aluminium oxide coatings on the surface properties of the SAE 305 aluminium alloy
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This paper presents an analysis of two surface treatments applied on the SAE 305 aluminium alloy: a diamond-like carbon coating and an anodisation process. The objective is to verify a potential wear resistance increase on the clamp-cable interface of an overhead transmission system. The evaluation of the coatings was carried out using micro-indentation technique, micro-abrasive wear tests and surface analysis. The parameters under study are hardness, roughness, wear volume and wear regime. The diamond-like carbon coating showed a significant improvement in wear resistance, whereas the anodisation process led to the opposite effect. The porosity of the anodised coating was identified as a cause for the wear resistance decrease while the enhancement provided by the diamond-like carbon coating is attributed to its high hardness, low roughness and to the occurring three-body wear regime.
KeywordsSAE 305 aluminium alloy Diamond-Like carbon coating Anodisation process
The authors would like to acknowledge the Fraunhofer Institute for Mechanics of Materials IWM for performing the surface treatment on the specimens used in this research. We also thank Capes/Brazil for the scholarship offered to Michel Sullivan Teixeira Pires and the Brazilian Program “Science Without Borders” (SWB-CNPq) for the financial support of the Projects 401671/2013-5 and 314034/2013-7.
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