Abstract
Surface modification is the process of altering physical or chemical characteristics of the work-piece surface. In this paper, various surface modification techniques have been discussed. One of the most appropriate surface modification technique is electrical discharge coating (EDC), in which the hard material is made to deposit onto the work-piece in a state of reverse polarity condition. Different mechanisms of carrying out EDC are presented. Deliberate material transfer takes place by using electrodes or by dispersant of metal powders into the di-electric. A detailed review of the literature on the theme of surface modification through the EDC has been conducted. In last, a framework for conducting surface modification by EDC employing using density electrodes of same material is presented.
Highlights
Electrical discharge machining (EDM) referred as spark erosion is widely accepted un-conventional method used to machine difficult to machine material by the traditional methods
Material removal rate (MRR), tool wear rate (TWR), surface roughness (SR) etc. are the output variables which helps in assessment of EDM performance [3]
EDM process can be employed for surface modification where tool material is transferred to the work sample
Summary
Electrical discharge machining (EDM) referred as spark erosion is widely accepted un-conventional method used to machine difficult to machine material by the traditional methods. Parts having intricate shapes and contours, specific dimensions can be developed by EDM process [1, 3]. Significance of this process is that tool and work-piece stay contactless [4] and free from mechanical stresses [4, 5]. EDM process can be employed for surface modification where tool material is transferred to the work sample. This process is called as electrical discharge coating (EDC) [6].
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