Effect of substrate grain size and surface treatments on the cutting properties of diamond coated Co-cemented tungsten carbide tools

Riccardo Polini*, Fabio Bravi, Fabrizio Casadei, Pierangelo D'Antonio, Enrico Traversa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Three sets of triangular (TPGN 160308) WC-6wt.%Co inserts having different average grain size (1, 3 and 6 μm) were submitted to surface roughening either by wet etching with Murakami's reagent or by a heat treatment in the hot filament chemical vapor deposition (HFCVD) reactor. The heat treatment was performed in a monohydrogen-rich atmosphere at substrate temperatures as high as 1000 °C. X-Ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) showed that this pre-treatment led to surface recrystallization of tungsten carbide and to a lower surface Co concentration. The fractional density and the bulk properties of the substrates, as determined by saturation magnetization and coercitivity measurements, were not affected by the thermal treatment. Prior to deposition, all inserts were etched with an acid solution of hydrogen peroxide. Diamond coatings were deposited by HFCVD. The coated inserts were tested by dry machining of MMC (Al-20% SiC) bars. Turning tests showed that a proper combination of substrate pretreatment and microstructure was necessary to maximize the life of diamond coated tools.

Original languageEnglish (US)
Pages (from-to)726-730
Number of pages5
JournalDiamond and Related Materials
Volume11
Issue number3-6
DOIs
StatePublished - Mar 1 2002

Keywords

  • Chemical vapor deposition
  • Diamond coated tools
  • Diamond properties and applications
  • Tungsten carbide

ASJC Scopus subject areas

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

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