Effects of carbon addition on wear mechanisms of CoCrMo metal-on-metal hip joint bearings.

Authors :: Chen Y
Li Y
Koizumi Y
Haider H
Chiba A
Source :: Materials science & engineering. C, Materials for biological applications [Mater Sci Eng C Mater Biol Appl] 2017 Jul 01; Vol. 76, pp. 997-1004. Date of Electronic Publication: 2017 Mar 24.
Publication Year :: 2017
Abstract: The wear behaviors of biomedical CoCrMo prosthetic alloys containing various amounts of carbon were investigated using a standard hip joint simulator in a simulated body fluid. A few chunks and punctate σ-phase precipitates were observed in the low-carbon (LC) alloy; these were responsible for the abrasion and run-in wear. Increasing the carbon content led to greater precipitation of globular M <subscript>23</subscript> C <subscript>6</subscript> -type carbides. As a result, lower wear loss was observed in the high-carbon (HC) alloy. However, the Student's t-test analysis on wear loss indicated that there was no significant difference in wear loss between the LC-LC and HC-HC combinations. Surface fatigue caused by torn-off of Mo-rich carbides was the dominant wear mechanism in the HC alloy. Further, Cr-rich carbides prevent three-body abrasion and increase the wear resistance.<br /> (Copyright © 2017 Elsevier B.V. All rights reserved.)

Subjects :: Alloys
Hip Joint
Hip Prosthesis
Materials Testing
Metal-on-Metal Joint Prostheses
Carbon chemistry

Language :: English
ISSN :: 1873-0191
Volume :: 76
Database :: MEDLINE
Journal :: Materials science & engineering. C, Materials for biological applications
Publication Type :: Academic Journal
Accession number :: 28482618
Full Text :: https://doi.org/10.1016/j.msec.2017.03.211

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