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Materials 2012, 5(11), 2360-2382; doi:10.3390/ma5112360
Article

Wear Behavior of Fiber Laser Textured TiN Coatings in a Heavy Loaded Sliding Regime

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Received: 8 October 2012 / Revised: 5 November 2012 / Accepted: 12 November 2012 / Published: 16 November 2012
Download PDF [3442 KB, 19 November 2012; original version 16 November 2012]

Abstract

In heavy loaded mating components, such as sliders and sliding bearings, guaranteeing the efficiency of lubricant films for long times during severe service conditions is very complicated. In this work, the benefits deriving from the use of fiber laser sources for surface texturing of very thin TiN coatings in severe wear working conditions were demonstrated. Evaluations of the laser textured dimples shape, geometry and density are given. Wear performance of the fiber laser textured surfaces was evaluated in discontinuous oil lubricated conditions with a flat contact. High normal load and low sliding speed were applied. Comparison tests were also performed on commercial TiN and WC/C coatings. In terms of average wear volume and maximum wear depth, Laser Surface Texturing of TiN provided respectively a 70% and a 45% reduction if compared to plain TiN. If compared to WC/C the wear resistance gains were lower but LST TiN maintained such benefits for longer wear runs. SEM analysis also revealed that the laser interaction provided a localized thermal cracking to the TiN coating. However, the sliding action caused very limited and localized coating fragmentation or delamination.
Keywords: laser surface texturing; active fiber laser; TiN coating; sliding wear; boundary lubrication regime; adhesive wear laser surface texturing; active fiber laser; TiN coating; sliding wear; boundary lubrication regime; adhesive wear
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Vandoni, L.; Demir, A.G.; Previtali, B.; Lecis, N.; Ugues, D. Wear Behavior of Fiber Laser Textured TiN Coatings in a Heavy Loaded Sliding Regime. Materials 2012, 5, 2360-2382.

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