Development of diamond-like carbon (DLC) coatings with alternate soft and hard multilayer architecture for enhancing wear performance at high contact stress.pdfVIP

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Development of diamond-like carbon (DLC) coatings with alternate soft and hard multilayer architecture for enhancing wear performance at high contact stress.pdf

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Development of diamond-like carbon (DLC) coatings with alternate soft and hard multilayer architecture for enhancing wear performance at high contact stress.pdf

SCT-22176; No of Pages 6 Surface Coatings Technology xxx (2017) xxx–xxx Contents lists available at ScienceDirect Surface Coatings Technology journal homepage: /locate/surfcoat Development of diamond-like carbon (DLC) coatings with alternate soft and hard multilayer architecture for enhancing wear performance at high contact stress Yanyan Lin ?, Abdul Wasy Zia, Zhifeng Zhou, Po Wan Shum, Kwok Yan Li Advanced Coatings Applied Research Laboratory, Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong, SAR, China article info Article history: Received 18 August 2016 Revised 18 January 2017 Accepted in revised form 2 March 2017 Available online xxxx Keywords: Diamond-like carbon Multilayer Unbalanced magnetron sputtering Tribological properties High contact stress Run-in abstract Diamond-like carbon (DLC) coatings have attracted overwhelming interest due to a wide range of exceptional mechanical and tribological properties. Unfortunately, they have limited tribological applications where high contact stresses are required due to high residual stresses. We proposed that multilayer DLC coatings may have potential for tribological applications at high stresses. In this study, DLC coatings consisting of alternate soft-layer and hard-layer were deposited onto M2 steel substrates using unbalanced magnetron sputtering technique. The tribological performance at high contact stresses (2.5 GPa, 3.2 GPa, and 4 GPa) was evaluated by a ballon-disc tribometer. The residual stress, the hardness and reduced modulus are increased with percentage of hard-layer thickness. Multilayer coatings with the soft-top layer improve wear performance compared with single-layer DLC coatings. In contrast, multilayer coatings without the soft-top layer show poor wear performance under high stresses. The soft-top layer reduces the wear volume during run-in period by forming a transfer layer so that decreases the total wear. The 50% hard multilayer coatin