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Improved adhesion of diamondlike coatings using shallow carbon implantation

Published online by Cambridge University Press:  31 January 2011

Gerard W. Malaczynski ,
Alaa A. Elmoursi ,
Chi H. Leung ,
Aboud H. Hamdi  and
Albert B. Campbell
Gerard W. Malaczynski
Affiliation:
Electrical and Electronics Department, General Motors Global Research and Development Operations, Warren, Michigan 48090
Alaa A. Elmoursi
Affiliation:
Electrical and Electronics Department, General Motors Global Research and Development Operations, Warren, Michigan 48090
Chi H. Leung
Affiliation:
Electrical and Electronics Department, General Motors Global Research and Development Operations, Warren, Michigan 48090
Aboud H. Hamdi
Affiliation:
Electrical and Electronics Department, General Motors Global Research and Development Operations, Warren, Michigan 48090
Albert B. Campbell
Affiliation:
Electrical and Electronics Department, General Motors Global Research and Development Operations, Warren, Michigan 48090
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Abstract

A surface layer of metal carbides provides an excellent interface to achieve a highly adherent diamondlike carbon (DLC) coating. A plasma immersion ion implantation (PIII)-based procedure is described, which delivers a high retained dose of implanted carbon at the surface of aluminum alloys. A shallow implantation profile, followed by argon sputter cleaning and continued until a saturated carbon matrix is brought to the surface, provides an excellent interface for subsequent growth of DLC. At a carbon retained dose above 1018 atoms/cm2 the DLC adhesion exceeds the coating's cohesion strength. Regardless of the silicon content in the aluminum, the coating produced by this method required tensile strengths typically exceeding 140 MPa to separate an epoxy-coated stud from the coating in a standard pull test. Improved DLC adhesion was also observed on chromium and titanium. The reported tensile strength is believed to substantially exceed performance of DLC coatings produced by any other method.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 3 , March 2000 , pp. 590 - 592
Copyright
Copyright © Materials Research Society 2000

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References

REFERENCES

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