A Study of TiN-Coated Metal-on-Polymer Bearing Materials for Hip Prosthesis

Title
A Study of TiN-Coated Metal-on-Polymer Bearing Materials for Hip Prosthesis
Authors
이성배최진영박원웅전준홍원성옥변지영임상호한승희
Keywords
coating; implantation; sputtering; interface; wear
Issue Date
2010-08
Publisher
Metals and Materials International
Citation
VOL 16, NO 4, 679-686
Abstract
The TiN-coated metal-on-polymer hip prosthetic pair has the potential to reduce wear debris of UHMWPE (ultra-high molecular weight polyethylene) and to prevent metallic-ion-induced cytotoxicity. However, high quality and adherent film is a key to the clinical success of hip prostheses. In this study, titanium nitride (TiN) films were deposited on stainless steel using plasma immersion ion implantation & deposition (PIII&D) technique to create high-quality film and an adherent interface. The chemical state and composition were analyzed by X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES) and energy dispersive spectroscopy (EDS). The mechanical properties of the films were characterized using a micro-hardness tester and a pin-on-disk wear tester, and an x-ray diffractometer (XRD) was used for a crystallographic analysis. The PIII&D-treated TiN films showed a stoichiometric and (200) preferred orientation and micro-hardness up to 150 % higher than untreated film. A TiN-coated specimen using the PIII&D process also showed less UHMWPE wear compared to untreated specimens. The volumetric wear rate of UHMWPE could be reduced by as much as 42 % compared to when Co-Cr alloy was used. The results of this study show that advanced TiN-coating via the PIII&D process is a viable means of reducing UHMWPE wear in the metal-on-polymer bearing couple.
URI
http://pubs.kist.re.kr/handle/201004/38387
ISSN
1598-9623
Appears in Collections:
KIST Publication > Article
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