Authors: Eswara Krishna Mussada; P.K. Patowari
Addresses: Department of Mechanical Engineering, National Institute of Technology, Silchar – 788010, Assam, India ' Department of Mechanical Engineering, National Institute of Technology, Silchar – 788010, Assam, India
Abstract: Electric discharge coating has become one of the emerging deposition processes which deposits both thick and thin films using same electric discharge machining (EDM) equipment, just by varying the operating parameters. In this experimental exertion, W and Cu powders of 325 mesh size have been selected as electrode material and aluminium as workpiece material. The main objective is to deposit a uniform layer of tungsten and its carbide over aluminium substrate using P/M green compact tools by electric discharge coating (EDC) process. Different characterisation techniques like SEM, EDX and XRD analysis have been used to observe the topography, presence of materials and the phase transformations while deposition process. Material transfer rate of 171.72 mg/min and the roughness of 6.2 µm have been achieved successfully.
Keywords: electrical discharge coating; EDC; electrical discharge machining; EDM; surface modification; surface integrity; powder metallurgy; electro-discharge machining; electrode materials; aluminium; tungsten; copper.
International Journal of Machining and Machinability of Materials, 2015 Vol.17 No.1, pp.65 - 78
Received: 18 Nov 2014
Accepted: 23 Dec 2014
Published online: 05 May 2015 *