Effect of WC-Co substrates pre-treatment and microstructure on the adhesive toughness of CVD diamond

S. Kamiya, H. Takahashi, R. Polini*, P. D'Antonio, Enrico Traversa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Well separated diamond particles were nucleated and grown by hot filament chemical vapor deposition (HFCVD) onto Co-cemented tungsten carbide (WC-Co). Two carbide grades were prepared. The former one was a ISO grade K10 carbide having a 1-μm average WC grain size, 5.8 wt.% Co and 0.2 wt.% VC. The latter one had a 6-μm average WC grain size, with 6 wt.% Co. Prior to deposition the substrates were submitted to two different pretreatments. The adhesive strength of deposited diamond crystallites was quantitatively determined in terms of interface toughness by directly applying an external load to the CVD diamond particles in the scanning electron microscope (SEM). The adhesive toughness was determined from the measurement of the maximum load required to scratch off the diamond crystallites. The variation of adhesive toughness was correlated to both the microstructure and the pretreatments of the substrate.

Original languageEnglish (US)
Pages (from-to)786-789
Number of pages4
JournalDiamond and Related Materials
Volume10
Issue number3-7
DOIs
StatePublished - Mar 1 2001

Keywords

  • Adhesion
  • Diamond properties and applications
  • Interface toughness
  • Tungsten carbide

ASJC Scopus subject areas

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

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