Effect of graphite concentration on the friction and wear of Ni–Al2O3graphite composite coatings by a combination of electrophoresis and electrodeposition》.pdf

Wear 342-343 (2015) 172 –180 Contents lists available at ScienceDirect Wear journal homepage: /locate/wear Effect of graphite concentration on the friction and wear of Ni–Al O /graphite composite coatings by a combination 2 3 of electrophoresis and electrodeposition Wan-chang Sun n, Pei Zhang, Kun Zhao, Miao-miao Tian, Ying Wang College of Materials Science and Engineering, Xi’an University of Science and Technology, No. 58 Yanta Middle Road, Xi’an, Shaanxi 710054, PR China a r t i c l e i n f o a b s t r a c t Article history: The purpose of this work was to investigate the sliding friction and wear of a novel Ni-based coating. Ni– Received 8 February 2015 Al O /graphite composite coatings were prepared on LY12 aluminum alloys using a three-step process 2 3 Received in revised form that involved electrophoresis and electrodeposition. Uniform composite coatings with a high volume 25 August 2015 content of particles were prepared. The effects of the deposition process on the wear mechanism of these Accepted 27 August 2015 coatings were investigated. The microindentation hardness decreased, while the friction coefficient and Available online 5 September 2015 wear loss of the coatings initially decreased and then slowly increased as the graphite content was Keywords: increased. The optimum value of the graphite particle concent