Highly adherent tungsten-containing diamond-like carbon (W-DLC) coating on a NiTi shape memory alloy under 10% tensile strain

Takanori Takeno, Hiroyuki Shiota, Toshifumi Sugawara, Hiroyuki Miki, Toshiyuki Takagi

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Highly adherent tungsten-containing diamond-like carbon coating (W-DLC) was investigated. Two types of W-DLC coating are deposited onto a mirror-polished SMA substrate by PECVD and co-sputtering of the tungsten metal target. A DLC coating is also investigated for comparison. Uniaxial tensile tests are performed for these three types of coating and the peeled-off area is estimated visually. The best adherence was achieved with a WD40 film and the peeled-off area was estimated to be ~ 1% even after 10% tensile strain was applied to the coating. To evaluate the adhesive strength, scratching tests were carried out and, of the three, WD40 showed the highest adhesive strength. The higher adhesive strength of the DLC coating results from a reduction in internal stress and a lowering of coating hardness by the introduction of additional elements.

Original languageEnglish
Pages (from-to)403-406
Number of pages4
JournalDiamond and Related Materials
Volume18
Issue number2-3
DOIs
Publication statusPublished - 2009 Feb

Keywords

  • DLC
  • High adhesive strength
  • Shape memory alloy

ASJC Scopus subject areas

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

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