Journal
SURFACE & COATINGS TECHNOLOGY
Volume 204, Issue 9-10, Pages 1330-1338Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2009.09.011
Keywords
Thin films; Air-plasma; Friction; Wear; UHMWPE; PFPE
Funding
- Faculty of Engineering, NUS [R-265-000-248-112]
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The effects of air-plasma treatment, film thickness, normal load and sliding speeds on the tribological properties of a thin film of Ultra-High Molecular Weight Polyethylene (UHMWPE) coated onto a tool steel substrate sliding against a Phi 4 mm silicon nitride ball was investigated. Wear tests are carried out on a ball-on-disk tribometer. Air-plasma treatment has enhanced the adhesion of the polymer film to the steel substrate which led to an increased wear life (> 100,000cycles) and low coefficient of friction (similar to 0.14) of the thin film. A film of optimum thickness of 16.3 +/- 2 mu m shows the maximum wear resistance. The effect of varying loads (0.3,1, 2 and 4 N) and speeds (200, 400, 600, 1000 and 2000 rpm) on wear life and coefficient of friction were also studied. The dual-film (UHMWPE/PFPE) on the air-plasma pre-treated tool steel surface further increased the wear life (> 200,000 cycles) at a load of 4 N and a rotational speed of 1000 rpm. (C) 2009 Elsevier B.V. All rights reserved.
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