The Effects of Graphite on Ceramic Coatings on LY12 Aluminium Alloys by Micro-Arc Oxidation

Abstract:

LY12 aluminum alloy samples were treated by micro-arc oxidation in sodium metasilicate electrolytes with graphite powder. The effects of graphite concentration on thickness, roughness, friction coefficient and phase composite of ceramic coating were investigated. The results indicated that the roughness and friction coefficient of ceramic coatings increased linearly. However, the thickness decreased adding graphite powder. XRD analyses indicated that the ceramic coatings fabricated on the surface of aluminum alloys by micro-arc oxidization were composed of graphite phase. SEM showed that the porosity of the ceramic coatings with distributing nonuniform micropore diameter were inceased with the increasing graphite concentration.

• Periodical: Advanced Materials Research (Volume 454)
• Pages: 126-129
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.454.126
• Online since: January 2012
• Authors: Jing Long Gao, Zhong Cai Shao
• Keywords: Ceramic Coating, Friction Properties, Graphite, LY12 Aluminium Alloy, Micro-Arc Oxidization

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