Oxygen plasma etching of diamond-like carbon coated mold-die for micro-texturing

Tatsuhiko Aizawa, Tatsuya Fukuda

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Diamond-like carbon (DLC) coating via PVD/CVD on the SKD11 substrate was employed to make micro-texturing by using high density oxygen plasma etching. Original pattern by metal chromium was first line-drawn on the surface of DLC coating; then, it was subjected to oxygen plasma etching. Even without any hazardous etchants such as CF4, high etching rate was attained only by using oxygen gas; i.e. 5μm/H. Plasma diagnosis by spectroscopy proved that this etching process should be controlled by activated oxygen atom flux of {O, O*}. Direct chemical reaction by C (in DLC)+O→CO, or, C (in DLC)+O*→CO, drove this etching process. Detection of CO peaks in the wave length range from 200 to 300nm also proved that this oxygen plasma etching should be advanced by chemical reactions. This etching behavior was insensitive to line width (WG) and pitch width (PG) for 2μm<WG<100μm and 5μm<PG<100μm. Scanning electron microscope and laser-profilometer were also used to make precise measurement on the etched profiles.

Original languageEnglish
Pages (from-to)364-368
Number of pages5
JournalSurface and Coatings Technology
Volume215
DOIs
Publication statusPublished - 2013 Jan 25

Keywords

  • DLC
  • Masking
  • Micro-grooving
  • Oxygen plasma etching
  • Plasma diagnosis
  • RF-DC plasmas

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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