Mechanical and tribological performance of a hybrid MMC coating deposited on Al–17Si piston alloy by laser composite surfacing technique

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 781H v 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.

Tribological Properties of 2D Materials and Composites—A Review of Recent Advances

“…Aluminum and titanium have been explored as an alternative to heavy-duty steel to produce machine parts [ 187 , 188 ]. Reinforcement of metals and alloys along with solid lubricants, hard ceramic particles, and fibers have been an area of interest in the development of MMC with precise balances of mechanical, physical and tribological characteristics [ 189 , 190 ]. Metal matrix composites reinforced with carbon, polymer, or ceramic fibers with varying compositions of solid-lubricant content have been investigated extensively for spacecraft applications [ 21 ].…”

“…MoS 2 , as the most successful solid lubricant in space applications, has gained a lot of eminence in the field of solid-lubrication research. Additionally, some investigations reported the use of Ni, WC, c-BN, and graphite solid-lubrication coatings on softer materials such as aluminum alloys to increase the surface hardness [ 190 , 191 , 192 ]. By contrast, the focus of automobile industries has primarily been on mixed lubrication, which is the combination of solid and liquid lubricants to address their tribological focused challenges.…”

Evaluation of a Nanostructured MWCNT based RAM Coating Applied to a Glass Fiber Composite

“…In this way, the durability of the RAM coatings can be checked and improved. We have tested these coatings in the X band (8)(9)(10)(11)(12). Further testing can be done in the Ku band (12)(13)(14)(15)(16)(17)(18) to improve the results further and to check the effectiveness of these coatings in higher bands.…”

“…The thickness of the RAM coating is proportional to the complex permittivity and permeability, and it can be varied correspondingly to the absorption band we want to overcome [9]. Structural material production is an emerging field, and day by day, many materials are formed by using composites knowledge [10,11,12]. These materials have several properties, and many composites are formed to be utilized in the aerospace industry.…”

Fabrication of mechanically resistant superhydrophobic synthetic suede materials

“…Since the surface of such substrates inevitably experiences all kinds of friction in practical applications, so much attention has been paid to promote the wear resistance of superhydrophobic exible materials in recent years. [41][42][43][44][45][46][47][48][49] One approach to create a durability of superhydrophobic surfaces is to endow materials with the ability to regenerate the surface roughness or restore the hydrophobic components. Zhang et al 50 reported a long lasting superhydrophobic surfaces by spraying polystyrene/SiO 2 core/shell particles as a coating skeleton and polydimethylsiloxane (PDMS) as hydrophobic interconnection.…”