Abstract
Electrophoretically deposited (EPD) nickel and its composite coatings are widely used to enhance the life span of continuous ingot casting molds in the steel, aerospace and automotive industries. This article reports the effect of different concentrations of diamond particles (2.5–10 g/L) on the wear mechanism of EPD Ni. The distribution of diamond particles in the Ni matrix was observed using Voronoi tessellation. Variation in COF was observed by a fretting wear test to be 0.51 ± 0.07 for Ni, which decreases to ~0.35 ± 0.03 for the Ni-diamond coatings. The wear volume of the coatings with 7.5 g/L concentration of diamond was observed to be a minimum (0.051 ± 0.02 × 10−3 mm3) compared with other composite coatings. Further, the micro-scratch testing of the coatings also exhibited a reduced COF (0.03–0.12) for 7.5 g/L diamond concentration compared with Ni (0.08–0.13). Higher wear resistance of the diamond-added coatings (optimum 7.5 g/L concentration) is due to the balance between the dispersion strengthening mechanism and the enhancement of the load-bearing capacity due to the incorporation of diamond particles. Thus, these composites can be used for applications in automotive and aerospace industries.
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Acknowledgements
The authors acknowledge the Advanced Centre for Material Science, and CARE grant, IIT Kanpur, for providing the optical profilometer and micro-scratch facility. Ms. Nimisha and late Prof R. Balasubramaniam are acknowledged for initiation of this work. Funding from MHRD, Govt. of India, is kindly acknowledged.
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Awasthi, S., Goel, S., Pandey, C.P. et al. Multi-Length Scale Tribology of Electrophoretically Deposited Nickel-Diamond Coatings. JOM 69, 227–235 (2017). https://doi.org/10.1007/s11837-016-2142-4
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DOI: https://doi.org/10.1007/s11837-016-2142-4