Experimental Investigation on Graphene Reinforced Aluminium Matrix Composites for Tribological Characterisation Using Pin-On-Disc Apparatus

The tribological behaviour of powder metallurgy-synthesised aluminium/Al2O3/Graphene has been investigated. The crystal structure, mechanical, and dry sliding wear behaviour of the manufactured composite were investigated. Advanced characterisation techniques like optical microscopy, SEM, and optical profilometer analysis were employed to investigate microstructure and worn surface morphology. The Universal Testing Machine's die and punch assembly was used to create four different cylindrical pre-forms with different Al2O3 content levels (0 wt.% %, 1 wt.% %, 3 wt.% %, and 5 wt.% %) at a compaction pressure of 120 KN. Different sintering temperatures of 490°C, 520°C, and 550°C have been achieved by using an Electrical Muffle Furnace. A pin-on-disc wear tester was used to study the sliding wear behaviour of a cylinder with a diameter of 12 mm against an EN-32 steel disc at a speed of 300 rpm and a distance of 4000 m in dry circumstances. Rockwell's Hardness machine with a 100 kg load applied at ball point is used to test hardness. Scanning Electron Microscopy (SEM) is used for micro-structural characterisation in order to look into the grain structure. Elevating the sintering temperature and adding more Al2O3 and 1% graphene made the specimen harder. Increasing the Al2O3 concentration and sintering temperature in experiments reduced wear. Microscopy by SEM showed that the Al2O3 particles were evenly dispersed throughout the aluminium matrix. Major Findings: Density increases with 5% Al2O3 content from 450°C to 490°C compared to 0%, 1%, and 3%. The specimen at 5% Al2O3 has low friction due to reduced wear than at 1%, 3%, and 5%. Innovative framework integration for mechanical and dry sliding behaviour enhancement.