Improvement of wear resistance of components for hydraulic actuators: Dry sliding tests for coating selection and bench tests for final assessment. (November 2017)

• Record Type: Journal Article
• Authors: Tonelli, L.; Martini, C.; Ceschini, L.
• Is Part Of: Tribology international. Volume 115(2017)
• Page Start: 154
• Page End: 164
• Publication Date: 2017-11
• Subjects: Wear -- Sliding -- Thermally-sprayed coatings -- Diamond-like coatings; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2017.05.021
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: Alternative coatings/surface treatments for the replacement of the ones currently used in a hydraulic actuator (where sliding motion occurs) were investigated. Candidate solutions were ranked on the basis of laboratory dry sliding tests, followed by bench tests. Thermal-spray coatings were outperformed by a-C:H DLC coatings with a WC/C interlayer, deposited in duplex combinations on carburised or plasma-nitrided steel. The best solution (DLC-coated carburised E470 steel sliding against DLC-coated plasma-nitrided 36CrNiMo4 steel) demonstrated a remarkable increase of contact duration: from less than 5 h in the current configuration, to 22 h without temperature or drain flow increase in the new configuration. Graphical abstract: Highlights: Sliding contact in a hydraulic actuator: investigations on thermal spray and DLC coatings. Ranking of candidate solutions by laboratory dry sliding tests. Best results by a-C:H DLC with a WC/C interlayer on carburised or plasma-nitrided steel. Bench tests on best coatings: increase of contact duration from 5 to 22 h.