Volume 41, No 4, 2019, Pages 498-515
Effect of Load, Sintering Temperature and Reinforcement Concentration on Al-Si/γ-Al2O3/GNP Self-Lubricating Hybrid Composite
Received: 8 September 2019
Revised: 11 October 2019
Accepted: 25 October 2019
Published: 15 December 2019
Latest advancements in nanotechnology has lately empowered improvement of Hybrid nanocomposites for basic structural applications. Carbon based materials, graphite, carbon nanotubes (CNT's), and graphene have novel mechanical, tribological and thermal properties. Owing to their lubricious nature, drew scientists to integrate lightweight self-lubricating hybrid nanocomposites with prevalent mechanical and tribological properties for various automotive, aerospace and marine applications. Hence the objective of this investigation is to determine, the frictional and wear attributes of self-lubricating novel hybrid nanocomposites. Friction and wear studies of self lubricating Eutectic Aluminium Silicon/Nano Aluminium Oxide/Graphene Nano Platelets hybrid composite with varying GNP content. In the present examination, aluminum hybrid nanocomposites were fabricated by Spark Plasma Sintering (SPS) to consolidate γ-Al2O3 and Graphene nano-platelets (GNP) particles into Eutectic Al-Si to reinforcenanocomposites. For this novel composition sample; the impacts of load, the impact of fortification, impact of sintering temperature has been evaluated. The samples were set up at three sintering temperature 450 °C; 500 ˚C; 520 ˚C. To research the tribological conduct of self-lubricating hybrid nanocomposites, ball-on-disc tests were performed. The wear and friction behavior of the composites were assessed for loads (50, 100, 150, 200, 250, 300 N) with sliding distance of 120 meter; stroke2mm and frequency at 30Hz. Results of the tribo test indicate that the novel hybrid self lubricating composite exit excellent anti friction anf anti wear properties compared to Al-Si/nano Aluminium Oxide composite. Reduction in friction and wear of the hybrid composite was reported in the range 12.41–40 % and 87.76–92.97 % compared to Al-Si/Nano Aluminium Oxide composite sample. The outcomes demonstrated that sintering temperature, reinforcement concentration and operational parameters have huge impact on the properties of composite. It was discovered that this novel self-lubricating hybrid nanocomposites indicated predominant tribological properties and exhibited the capacity of self-lubricating composite amid tribological conditions. Frictional surfaces were explored utilizing portrayal instruments such as Scanning Electron Microscopy (SEM), Electron Dispersion Microscopy (EDS), X-Ray Dispersive Microscopy (XRD) and 3-D Surface Profilometer.
Friction, Wear, Self-Lubrication, Asperities, Automotive Applications