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Fabrication and Characterization of Functionally Gradient Diamond-Like Carbon Coatings

Published online by Cambridge University Press:  10 February 2011

Q. Wei ,
A. K. Sharma ,
S. Yamolenko ,
J. Sankar  and
J. Narayan
Q. Wei
Affiliation:
NSF Center for Advanced Materials and Smart Structures, Dept of Mechanical Engineering, McNair Hall, North Carolina A&T State University, Greensboro, NC 27411, quiming@ncat.edu
A. K. Sharma
Affiliation:
Department of Materials Science and Engineering, Burlington Labs, P. O. Box 7916, North Carolina State University, Raleigh, NC 27695-7916
S. Yamolenko
Affiliation:
NSF Center for Advanced Materials and Smart Structures, Dept of Mechanical Engineering, McNair Hall, North Carolina A&T State University, Greensboro, NC 27411, quiming@ncat.edu
J. Sankar
Affiliation:
NSF Center for Advanced Materials and Smart Structures, Dept of Mechanical Engineering, McNair Hall, North Carolina A&T State University, Greensboro, NC 27411, quiming@ncat.edu
J. Narayan
Affiliation:
Department of Materials Science and Engineering, Burlington Labs, P. O. Box 7916, North Carolina State University, Raleigh, NC 27695-7916
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Abstract

Pure diamondlike carbon thin films largely bonded by four-fold coordination suffer from a large internal compressive stress that gives rise to a serious adhesion problem. In this work, functionally gradient (FG) diamondlike carbon thin coatings were prepared by pulsed laser deposition in a high vacuum chamber as an alternative approach to address the adhesion problem of diamondlike films. Copper, silver and titanium were incorporated into the growing films with their concentration as a function of the distance from the substrate surface. The top of the thin coating is pure DLC of about 400 nm in thickness. The total thickness of the functionally graded superhard DLC coatings can exceed 1.0 μm without buckling. Visible micro-Raman spectroscopy was used to characterize the bonding structure of the layers which contain alloy atoms. High resolution transmission electron microscopy was employed to study the microstructure of the coatings. Nanoscale mechanical characterizations using Nanoindenter XPTM were carried out to study the mechanical behavior of the functionally gradient DLC films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 593: Symposium U – Amorphous & Nanostructured Carbon , 1999 , 323
Copyright
Copyright © Materials Research Society 2000

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References

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