Humidity dependence of the tribological behavior of diamond-like carbon films against steel ball

Se Jun Park, Jong Kuk Kim, Kwang Ryeol Lee, Dae Hong Ko

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Diamond-like carbon (DLC) films deposited on Si(100) wafer by r.f.-plasma assisted chemical vapor deposition were friction tested by ball-on-disk type tribometer in various test environments. The friction tests were performed in an ambient air of relative humidity ranging from 0 to 90% or dry oxygen environment. We focused on the tribochemical reactions by analyzing the chemical composition, chemical bond structure and agglomerated shape of the debris. High and unstable frictional behavior was observed in both humid air and dry oxygen environment. In these environments, Auger spectrum analysis showed that the debris contained large amount of Fe. Significant incorporation of Fe in the debris resulted from the wear of the steel ball, which might be enhanced by the surface oxidation of the ball. However, a very low frictional coefficient was observed against the sapphire ball even in dry oxygen environment. These results show that the increased frictional coefficient of the DLC film is closely related with the increased Fe concentration in the debris. Hence, the humidity dependence of the frictional coefficient is not an inherent tribological property of DLC film but results from the surface reaction of the steel ball with humid environment. Two possible reasons for the Fe rich debris to affect the frictional behavior were suggested.

Original languageEnglish
Pages (from-to)1517-1523
Number of pages7
JournalDiamond and Related Materials
Volume12
Issue number9
DOIs
Publication statusPublished - 2003 Jan 1

Fingerprint

Diamond like carbon films
Steel
Debris
Atmospheric humidity
Oxygen
Friction
Aluminum Oxide
Chemical bonds
Surface reactions
Air
Sapphire
Spectrum analysis
Chemical vapor deposition
Wear of materials
Plasmas
Oxidation
Chemical analysis

All Science Journal Classification (ASJC) codes

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

Cite this

Park, Se Jun ; Kim, Jong Kuk ; Lee, Kwang Ryeol ; Ko, Dae Hong. / Humidity dependence of the tribological behavior of diamond-like carbon films against steel ball. In: Diamond and Related Materials. 2003 ; Vol. 12, No. 9. pp. 1517-1523.
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Humidity dependence of the tribological behavior of diamond-like carbon films against steel ball. / Park, Se Jun; Kim, Jong Kuk; Lee, Kwang Ryeol; Ko, Dae Hong.

In: Diamond and Related Materials, Vol. 12, No. 9, 01.01.2003, p. 1517-1523.

Research output: Contribution to journalArticle

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