Design of functionally graded carbon coatings against contact damage

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

21 Scopus Citations
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Author(s)

  • Rajnish K. Singh
  • Zhifeng Zhou
  • Paul Munroe
  • Mark Hoffman
  • Zonghan Xie

Detail(s)

Original languageEnglish
Pages (from-to)5769-5776
Journal / PublicationThin Solid Films
Volume518
Issue number20
Publication statusPublished - 2 Aug 2010

Abstract

Three different functionally graded amorphous carbon (a-C) thin films were deposited on to aluminium substrates using a closed-field unbalanced magnetron sputtering ion plating method. The closed-field configuration prohibits the loss of secondary electrons and consequently enhances the plasma density significantly. The functional gradient of the a-C films was achieved by varying the bias voltage linearly during deposition. Three graded a-C systems possessing different variations in Young's modulus were deposited with the highest Young's modulus at the (i) top surface, (ii) interface or (iii) middle of the film. Of the three systems investigated, the one with the highest Young's modulus at the middle of the film thickness was found to exhibit significantly lower levels of cracking at higher indentation depths. Finite element models that included an embedded ring crack controlled by cohesive zone elements were developed to clarify the effect of ring cracks on the deformation of the films. This study provides guidance for the design of functionally graded coatings against contact damage. Crown Copyright © 2010 Published by Elsevier B.V. All rights reserved.

Research Area(s)

  • Finite element analysis, Graded films, Nanoindentation, Scanning electron microscopy, Young modulus

Citation Format(s)

Design of functionally graded carbon coatings against contact damage. / Singh, Rajnish K.; Zhou, Zhifeng; Li, Lawrence Kwok Yan; Munroe, Paul; Hoffman, Mark; Xie, Zonghan.

In: Thin Solid Films, Vol. 518, No. 20, 02.08.2010, p. 5769-5776.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal