Extremely low wear rates in hip joint bearings coated with nanocrystalline diamond
authors Amaral, M; Maru, MM; Rodrigues, SP; Gouvea, CP; Trommer, RM; Oliveira, FJ; Achete, CA; Silva, RF
nationality International
journal TRIBOLOGY INTERNATIONAL
author keywords Nanocrystalline diamond; Wear simulation; Ceramic hip joint
keywords STRUCTURAL ORTHOPEDIC IMPLANTS; SILICON-NITRIDE CERAMICS; METAL-ON-METAL; ARTHROPLASTY; PROSTHESES; REPLACEMENT; COATINGS; ALUMINA; CYTOTOXICITY; POLYETHYLENE
abstract A hip joint wear simulator is used for the first time to evaluate the performance of acetabular liners and femoral heads made of silicon nitride ceramic coated with nanocrystalline diamond (NCD), grown by a hot filament chemical vapor deposition (HFCVD) method. Wear is assessed by gravimetry, by which volume and linear wear are estimated. Even with only one million cycles of test, a very stimulating finding is the extremely low wear rate of the head after the diamond polishing running-in step, of about 0.005 mm(3)/million cycles (Mc). This corresponds to a linear wear of 0.08 mu m/Mc, one order of magnitude better than the best value currently known for ceramic-on-ceramic hip joints. Small scale abrasion is found as the dominant wear mechanism. (C) 2014 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0301-679X
year published 2015
volume 89
beginning page 72
ending page 77
digital object identifier (doi) 10.1016/j.triboint.2014.12.008
web of science category Engineering, Mechanical
subject category Engineering
unique article identifier WOS:000357749900011
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