Influence of counter material on friction and wear performance of PTFE–metal binary coatings

• Published in: Tribology international Vol. 41; no. 4; pp. 269 - 281
• Main Authors: Yamane, Masaaki, Stolarski, Tadeusz A., Tobe, Shogo
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.04.2008; Elsevier
• Subjects: Applied sciences; Composites; Exact sciences and technology; Forms of application and semi-finished materials; Friction, wear, lubrication; Machine components; Mechanical engineering. Machine design; Mechanical properties; Physical properties; Pin-on-disc configuration; Polymer industry, paints, wood; Properties and testing; PTFE; Sliding contact; Surface coating; Technology of polymers; Pin-on-disc configuration; Surface coating; PTFE; Sliding contact; Sprayed coatings; Mild steel; Wear test; Tetrafluoroethylene polymer; Mechanical contact; Experimental study; Contact surface; Dry friction; Plastic coating; Surface hardness; Molybdenum alloy; Metal coating; Plasma spraying; Pin disk test; Room temperature; Tribology
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2007.07.008

The study presented in this paper concerns the influence of the counter materials on wear and friction performance of polytetrafluoroethylene (PTFE) reservoirs arranged in distinct patterns on coated surfaces. Al-bronze and Mo coatings were deposited on a mild steel substrate using an atmospheric plasma spray process. Three patterns of PTFE reservoirs were used. Pins, which served as counter surface, were made of three different materials. Wear tests were carried out in a pin-on-disc test rig at room temperature and under dry contact conditions. The tests were carried out at a constant pressure of 10 MPa. An average linear speed of the test disc was 0.036 m/s. The importance of appropriately matched hardness of two surfaces in sliding contact is emphasised. Due to inadequate hardness of the counter material, performance of Mo coating was adversely affected and expected beneficial action of PTFE reservoirs severely hindered. Al-bronze coating proved to be performing far better than Mo coating. Serious deterioration of Mo coating occurred faster than that for Al-bronze coating.