Influence of Silica on Microstructural Modification of Electrical Discharge Composite Coating and its Wear Performance

A comparison on microstructure and mechanical properties of electric discharge metal matrix nickel and silica composite coating on duplex stainless steel

“…Transfer of copper from electrode together with nickel having combined properties of cupronickel (Nickel addition with Copper) that regenerates several layer during sliding at higher temperature copper losses its electron results in self-lubrication properties together with carbon according to previous investigations. 15,16 The similarity in wear, frictional co-efficient also observed under higher loading conditions rate of debris transfer with micro abrasion also appeared over silica than nickel accumulated in between splatters reduces wear rate were else for silica accumulation of semi molten iron carbide together with carbon having coarse debris that replicates more wear during lower loading conditions. Based on ASTM standards of measurements wear rate are identified through volume loss of material as per the calculations below based on that corresponding wear rate are listed in Table 8 for both alloying materials.…”

“…Spark gaps widening avoids metallurgical deformation with reduces surface cracks over substrate material based on its conductivity and optimised powder concentration. 16 Nickel prevents thermal retardation, splashing of molten droplets while propagation initiated inside the dielectric fluid are localized by discharge of heat that slow down its solidification process for prolonged time interval that reduces residual stress and surface roughness which improves coating properties. 18 At closure increase in negative pressure shows carbon flakes around boundaries, particles nearer to collusion shows fast penetration of alloying elements together with collided elements that attains higher temperature.…”

“…The variation in loading condition show similar other mechanism like grinding of groves, pits, pull outs, wear debris are common are disclosed in previous research. 16,18–22…”

“…Alloying process parameter an important factor to obtain surface finish in certain for alloying higher in pulse-on time (P on ), higher in current (A) and lowering the pulse off (P off ) are necessary for effective deposition, lowering current and pulse-on time (P on ), increasing pulse off (P off ) results in less thermal distortion having tremendous surface finish and effective alloying parameter setting are listed in Table 2 from previous research. 16…”

Process Optimisation and Tribological Behaviour Studies on Surface Modified Al 6061-T6 Alloy Deposited with WS2 Solid Lubricant Layer Through Electrical Discharge Approach

“…which increases the processing cost and also it require expensive post-processing and curing process. Considering all these aspects, EDD is a process of depositing the elements through a die-sink electrical discharge machining (EDM) with the aid of the advancement of reversing the machine polarity, which confirms the material deposition on the substrate instead of material removal in EDM [8]. This deposition technique is classified into two categories: a powder mixed in the dielectric medium called a powder mixed electrical discharge machining (PMEDM).…”