Authors: Manvandra Kumar Singh; Rakesh Kumar Gautam
Addresses: Department of Mechanical Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India ' Department of Mechanical Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India
Abstract: In the present investigation, dry sliding friction and wear behaviour of developed copper-based hybrid composites were studied. Tungsten carbide (WC), zirconia (ZrO2), alumina (Al2O3) of grade A6 and chromium (Cr) hybrid reinforcements were utilised to develop various copper-based hybrid composites using liquid stir-casting technique. The developed hybrid composites were characterised by X-rays diffraction (XRD), high-resolution scanning electron microscope (HR-SEM), energy-dispersive analysis of X-rays (EDAX), relative density and Vickers hardness. Developed hybrid composites show improved Vickers hardness compared to its copper matrix while relative density was found lower. Dry sliding friction and wear behaviour of the developed hybrid composites were studied using pin-on-disc tribometer at variable normal load, constant sliding speed and sliding distance. Hybrid composites exhibited low wear compared to its copper matrix, particularly (WC + Al2O3 + Cr) hybrid reinforced composites revealed better wear resistance among all. Fluctuating nature of the coefficient of friction was observed in all the materials. However, developed hybrid composites revealed higher coefficient of friction compared with its matrix. The worn surfaces were analysed using scanning electron microscopy (SEM), EDAX and optical profilometer to discuss the friction and anti-wear mechanism involved in developed materials.
Keywords: metal matrix hybrid composite; stir-casting; X-ray diffraction; wear; worn surface; hardness; coefficient of friction; dry sliding; profilometer; colour-mapping; surface roughness.
International Journal of Surface Science and Engineering, 2019 Vol.13 No.2/3, pp.133 - 155
Received: 03 Apr 2018
Accepted: 18 Oct 2018
Published online: 17 Sep 2019 *