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Microcrystalline and Nanocrystalline Diamond Film Deposition on Cobalt Chrome Alloy

Published online by Cambridge University Press:  10 February 2011

Marc D. Fries  and
Yogesh K. Vohra
Marc D. Fries
Affiliation:
Department of Physics, University of Alabama at Birmingham, Birmingham, AL 35294–1170, vohra@phy.uab.edu
Yogesh K. Vohra
Affiliation:
Department of Physics, University of Alabama at Birmingham, Birmingham, AL 35294–1170, vohra@phy.uab.edu
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Abstract

The cobalt chrome alloy Co-28Cr-6Mo is widely used in human joint replacement applications. These joints are highly sensitive to wear and are usually replaced after approximately ten years of use. In order to extend these implants' service lifetimes, a thin film of diamond may be applied to the implant wear surfaces by microwave plasma chemical vapor deposition (MPCVD) following MPCVD nitridation. Diamond films often delaminate from cobalt chrome due to a high thermal expansion mismatch. Additionally, under most conditions diamond films degrade into graphite by dissolution of nuclei into solvents like Co and Cr. By nitriding the cobalt chrome through MPCVD prior to diamond deposition, a usable diamond film may be achieved. It may be possible to merge both the nitriding and deposition steps into a single process, since both nitridation and deposition will be performed by MPCVD. In addition, controlled amounts of nitrogen in hydrogen/methane plasma under CVD conditions result in a nanostructured diamond coating. We have investigated the formation of both micro- and nanocrystalline diamond formation on cobalt chrome.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 594: Symposium V – Thin Films - Stresses & Mechanical Properties VIII , 1999 , 307
Copyright
Copyright © Materials Research Society 2000

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References

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