Journal
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
Volume 4, Issue 7, Pages 953-960Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmbbm.2011.02.005
Keywords
Ti6Al4V; Coating; UHMWPE; Friction; Wear; Tribology
Funding
- National Research Foundation (NRF), Singapore [NRF-CRP 2-2007-04]
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Ultra-high molecular weight polyethylene (UHMWPE) thin film was coated onto Ti6Al4V alloy specimens using dip coating method. Tribological performance of this coating (thickness of 19.6 +/- 2.0 mu m) was evaluated using 4 mm diameter Si(3)N(4) ball counterface in a ball-on-disk tribometer. Tests were carried out for different normal loads (0.5, 1.0, 2.0 and 4.0 N) and rotational speeds of the disk (200 and 400 rpm). UHMWPE coating formed in this study exhibits high hydrophobicity with water contact angle of 135.5 +/- 3.3 degrees and meets the requirements of cytotoxicity test using the ISO 10993-5 elution method. This coating shows low coefficient of friction (0.15) and high wear durability (>96,000 cycles) for the tested conditions. PFPE overcoat on UHMWPE has further increased the wear durability of UHMWPE coating as evaluated at even higher rotational speed of 1000 rpm. (C) 2011 Elsevier Ltd. All rights reserved.
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