Study on mechanical properties of anodised film containing nano-diamond particles

Abstract

Anodic-composite films containing nano-diamond particles (ND) were prepared on 7000 aluminium alloy using an anodising method. The micro-structures of the film were studied by scanning electron microscopy, energy dispersive X-ray spectroscopy, atomic force microscopy and minitab software (version 16). The results indicate that the micro-hardness and wear resistance of the films were improved using the nano-additive. Thus, the wear loss of the composite (the film anodised in the bath containing of sulphric acid, oxalic acid and 85 g L −1 ND) evaluated by dry sliding friction test for 50 000 cycles at room temperature, was 0.4 mg compared to 3 mg in the absence of ND, a 750% improvement. The friction of ND composite anodic films is significantly less than the samples without the added particles. Moreover, the micro-hardness of the composite film reached a maximum value of 770 VHN. The results also show that the mechanical properties of the composite films are mainly dependent on the structure of the oxide films.

Frictional Behaviour of Composite Anodized Layers on Aluminium Alloys

“…MAO methods have become an interesting solution for creating anodic layers on aluminium alloys, due to the fact that anodized layers are established with a competitive phenomenon of their dissolution by micro-discharges causing local melting of the oxide and its conversion into α-Al 2 O 3 or γ-Al 2 O 3 type phases, which translates directly into high operational properties of the layer. This process can be easily parameterized in terms of the proportion of individual phases and the degree of porosity [ 17 , 18 ].…”