Characterisation of layer deposited by electric discharge coating process

Abstract

The present work focuses on characterisation of the deposited layer on aluminium substrate processed with electric discharge coating process. Different characterisation techniques such as scanning electron microscopy, energy dispersive X-ray and X-ray diffraction (XRD) have been employed to study the surface morphological changes, presence of materials and their phase transformations due to the formation and deposition of composite material layer on work surface. The grain size of the deposited particles has a significant effect on mechanical properties. Thus, an attempt has been made to calculate the grain size, dislocation density and microstrain of deposited material and its particles. The formation of tungsten carbides, namely, WC and W₂C, is detected through XRD analysis. Clusters of globular particles in nanoscale are observed throughout the deposited layer.

Keywords:

• EDC
• EDM
• Surface
• Modification
• Integrity
• Powder metallurgy