Reciprocating Sliding Wear of Cu, Cu-SiC Functionally Graded Coating on Electrical Contact


The present work evaluates the coefficient of friction (CoF), electrical resistivity, and electrical contact resistance (ECR) of the electrodeposited single-layered Cu-SiC nanocomposite coating and five-layered Cu, Cu-SiC functionally graded coating (FGC). Both the coatings have a similar thickness (60 µm) and same composition at the top surface (7 vol.% reinforced SiC nanoparticles), while the FGC has a gradient of composition and microstructure throughout the thickness. The Cu, Cu-SiC FGC has two layers of Cu-SiC with a decrement in the content of SiC nanoparticles from 7 to 2 vol.% followed by three Cu layers with an increasing crystallite size towards the substrate. The electrical resistivity of the Cu, Cu-SiC FGC is measured by the four-wire resistance measurement method and the value is observed to be 50% less than the conventional nanocomposite coating. A linear reciprocating sliding wear test is carried out at 2, 5 and 8 N load at a constant frequency and stroke length of 10 Hz and 2 mm, respectively. The monitored value of CoF is significantly less for the Cu, Cu-SiC FGC than the single-layered coating at 2 and 5 N loads and is nearly equal at 8 N load. It is observed that before wear, the ECR values of both the coatings are higher than the uncoated Cu and after wear the ECR value of Cu, Cu-SiC FGC is the lowest.

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The authors would like to thank Mr S. K. Karan, Technical Superintendent, Department of Physics, Indian Institute of Technology Kharagpur to help in measuring the ECR.


The authors declare no competing financial interest.

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Correspondence to Karabi Das.

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Banthia, S., Amid, M., Sengupta, S. et al. Reciprocating Sliding Wear of Cu, Cu-SiC Functionally Graded Coating on Electrical Contact. J. of Materi Eng and Perform 29, 3930–3940 (2020).

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  • coefficient of friction
  • electrodeposition
  • electrical contact resistance
  • electrical resistivity
  • functionally graded coating