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Wear Behavior of Fiber Laser Textured TiN Coatings in a Heavy Loaded Sliding Regime
Department of Applied Science and Technologies, Politecnico di Torino, Cso Duca degli Abruzzi, 24, Torino 10129, Italy
Department of Mechanics, Politecnico di Milano,Via La Masa, 1, Milano 20156, Italy
* Author to whom correspondence should be addressed.
Received: 8 October 2012; in revised form: 5 November 2012 / Accepted: 12 November 2012 / Published: 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
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MDPI and ACS Style
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.
Vandoni L, Demir AG, Previtali B, Lecis N, Ugues D. Wear Behavior of Fiber Laser Textured TiN Coatings in a Heavy Loaded Sliding Regime. Materials. 2012; 5(11):2360-2382.
Vandoni, Laura; Demir, Ali G.; Previtali, Barbara; Lecis, Nora; Ugues, Daniele. 2012. "Wear Behavior of Fiber Laser Textured TiN Coatings in a Heavy Loaded Sliding Regime." Materials 5, no. 11: 2360-2382.