Comparing internal stress in diamond-like carbon films with different structure

Peng Wang, Xia Wang, Tao Xu, Weimin Liu, Junyan Zhang

Research output: Contribution to journalArticlepeer-review

113 Scopus citations

Abstract

Diamond-like carbon (DLC) films with different structures were deposited on Si (100) and stainless steel substrates in a hybrid deposition system with Ar and CH4 as the feedstocks. The effects of the bias voltage, Ti-interlayer, Ti functional gradient layer and Ti-doping on the internal stress in DLC films were investigated. The results show that the internal stress in DLC films arises from both the intrinsic stress generated during the film growth and the thermal stress generated due to the mismatching of the thermal expansion coefficient between the DLC films and the substrate materials. The intrinsic stress can be released through doping titanium element at the expense of reducing the sp3/sp2 ratio. The thermal stress in DLC films can be decreased through introducing Ti-interlayer or Ti functional gradient layer. Noticeably, DLC films with very low internal stress deposited on stainless steel can be obtained through the combination of Ti-doping and Ti functional gradient layer.

Original languageEnglish
Pages (from-to)6899-6903
Number of pages5
JournalThin Solid Films
Volume515
Issue number17
DOIs
StatePublished - Jun 2007
Externally publishedYes

Keywords

  • DLC films
  • Functional gradient
  • Internal stress
  • Ti-doping
  • Ti-interlayer

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