Title: Wear of chromium nitride coating under high loads and speeds

Authors: Shailesh Kumar Singh; Somnath Chattopadhyaya; A. Pramanik; Sanjeev Kumar; A.K. Basak

Addresses: Department of Mechanical Engineering, Indian Institute of Technology (ISM), Dhanbad, Jharkhand, India ' Department of Mechanical Engineering, Indian Institute of Technology (ISM), Dhanbad, Jharkhand, India ' Department of Mechanical Engineering, Curtin University, Bentley, WA, Australia ' Department of Mechanical Engineering, Krishna Engineering College, Ghaziabad, India ' Adelaide Microscopy, The University of Adelaide, Adelaide, SA, Australia

Abstract: This paper investigates the effect of high loads (up to100 N) and high speeds (up to 3 m/s) on wear and friction behaviour of PVD deposited CrN coatings on cast iron substrate. Uncoated substrate materials were also tests under identical test parameters to compare the friction coefficient, wear rate, temperature generation accompanied with wear mechanism. With the increase of normal loads from 50 N to 80 N the wear rate of coated sample increases from 4.59 × 10⁻⁵ mm³/Nm to 6.86 × 10⁻⁵ mm³/Nm, while the sliding speed remains constant. Temperature rise due to friction was monitored in wear tracks, and higher wear track temperature (from 65°C to 178°C) simulates higher coating wear as well as degradation of materials. The wear mechanisms of the CrN coatings involve pull out of nitride particles, oxidation of wear particles, adhesive wear and a combination of fatigue delamination as evident from wear track morphology investigated by scanning electron microscope.

Keywords: coating; wear-resistant; physical vapour deposition; PVD; wear; temperature; automotive.

DOI: 10.1504/IJSURFSE.2019.103929

International Journal of Surface Science and Engineering, 2019 Vol.13 No.4, pp.263 - 282

Received: 06 Apr 2019
Accepted: 07 May 2019
Published online: 02 Dec 2019 *

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