Mechanical and tribological performance of a hybrid MMC coating deposited on Al–17Si piston alloy by laser composite surfacing technique |
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| Authors: | M M Quazi M Ishak A Arslan M A Fazal Farazila Yusof B S Sazzad M Nasir Bashir M Jamshaid |
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| Institution: | Department of Mechanical Engineering, Faculty of Engineering, Universiti Malaysia Pahang, Pekan, 26600 Malaysia, +60-192048281 ; Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur Malaysia ; Department of Mechanical Engineering, University of Jeddah, Saudi Arabia ; Department of Mechanical Engineering, International University of Business Agriculture and Technology, Dhaka Bangladesh |
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| Abstract: | Laser composite surfacing (LCS) is a photon driven manufacturing technology that can be utilized for depositing hybrid metal matrix composite coatings (HMMC) on softer Ti/Al/Mg alloys to enhance their tribo-mechanical properties. LCS offers the advantages of higher directionality, localized microstructural refinement and higher metallurgical bonding between coating and substrate. The current research presents the tribo-mechanical evaluation and characterization of solid lubricant based Ni–WC coatings deposited by LCS on Al–Si piston alloy by varying the concentration of graphite between 5-to-15-weight percentage. The tribological behavior of LCS samples was investigated using a ball-on-plate tribometer. Results indicate that the surface hardness, wear rate and friction coefficient of the Al–Si hypereutectic piston alloy were improved after LCS of graphite based HMMC coatings. The maximum surface hardness of 781Hv was acquired for the Ni–WC coating containing 5 wt% graphite. The friction coefficient of Al–Si under dry sliding conditions was reduced from 0.47 to 0.21. The reduction in the friction coefficient was attributed to the formation of a shearable transfer layer, which prevented delamination and reduced adhesion, abrasion and fatigue cracking.The addition of graphite as solid lubricant has significantly reduced the friction coefficient and wear of a Ni–WC composite coating. |
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