Abstract
The current work evaluated the friction and wear properties of tribological design surface coatings on aluminium alloy 7075 under various speed and nominal contact pressure. Hard-anodized Aluminium Oxide (Al2O3), burnished Refractory Metal Sulfide (MoS2) and composite electroless nickel coatings with polytetrafluoroethylene (Ni–P–PTFE) particles were subjected to pin-on-disc sliding test against grey cast iron (GCI) under Mach 5 SL SAE 10W-30 lubrication. The results indicated that Ni–P–PTFE composite coating possessed excellent friction–reduction capability but limited wear resistance due to low mechanical strength. Al2O3 coated sample showed outstanding wear resistance with high friction characteristic leading to high surface contact temperature. Furthermore, MoS2 coating improved the wear resistance of the aluminium alloy.
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