Title: Nanomechanical and nanotribological properties of self-lubricating Ti/MoS₂ nanocoating at nanoscale level

Authors: Summera Banday; M.F. Wani

Addresses: Tribology Laboratory, Department of Mechanical Engineering, National Institute of Technology, Hazratbal, Srinagar, J&K, 190006, India ' Tribology Laboratory, Department of Mechanical Engineering, National Institute of Technology, Hazratbal, Srinagar, J&K, 190006, India

Abstract: Ti/MoS₂ coating of thickness 99.79 nm was prepared by pulse laser deposition method on Al-Si substrate. Mechanical and nanotribological properties of Ti/MoS₂ coating were obtained by carrying out nanoindentation, nanoscratch and nanowear tests at low loads. It was observed that Young's modulus and nanohardness of Ti/MoS₂ coating decrease with increasing load. The coefficient of friction also decreases with the increase in sliding distance, which proves that Ti/MoS₂ coating have self-lubricating property. The wear rate of Ti/MoS₂ coating increases from 5.7 × 10⁻¹⁰ mm³/Nm to 2.1 × 10⁻⁹ mm³/Nm with the increase in load. Scanning probe microscope images of Ti/MoS₂ coating shows the plastic flow of coating with no debris and cracks on the surface. It indicates that the abrasive wear is the main wear mechanism.

Keywords: nanocoating; nanoindentation; nanoscratch; nanowear.

DOI: 10.1504/IJSURFSE.2020.108201

International Journal of Surface Science and Engineering, 2020 Vol.14 No.2, pp.89 - 104

Received: 24 Jun 2019
Accepted: 23 Jul 2019
Published online: 06 Jul 2020 *

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