Microstructure and mechanical properties of WC-C nanocomposite films

Se Jun Park, Kwang Ryeol Lee, Dae Hong Ko, Kwang Yong Eun

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

WC-C nanocomposite film was prepared by using a hybrid deposition system of r.f.-PACVD and DC magnetron sputtering. W concentration in the film was varied from 5.2 to 42 at.% by changing the CH4 fraction of the mixture sputtering gas of Ar and CH4. Hardness, residual compressive stress and electrical resistivity were characterized as a function of W concentration. Raman spectroscopy, XRD and high resolution TEM were employed to analyze the structural change in the film for various W concentrations. In the present W concentration range, the film was composed of nano-sized WC particles of diameter less than 5 nm and hydrogenated amorphous carbon matrix. Content of the WC particles increased with increasing W concentration. However, the mechanical properties of the film increased only when the W concentration was higher than 13 at.%. Structural analysis and electrical conductance measurements evidently showed that the increase in hardness and residual stress occured as the WC particles were in contact with each other in the amorphous carbon matrix.

Original languageEnglish
Pages (from-to)1747-1752
Number of pages6
JournalDiamond and Related Materials
Volume11
Issue number10
DOIs
Publication statusPublished - 2002 Oct

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering

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