Dry turning of alumina/aluminum composites with CVD diamond coated Co-cemented tungsten carbide tools

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

Triangular (TPGN 160308) WC-6 wt.%Co inserts having different average grain sizes (1 and 3 μm) were submitted to surface roughening either by wet etching with Murakami's reagent or by a heat treatment in the hot filament chemical vapour deposition (HFCVD) reactor. The heat treatment was performed in a monohydrogen-rich atmosphere at substrate temperatures as high as 1000 °C. Scanning electron microscopy and energy-dispersive spectroscopy showed that this pre-treatment led to surface roughening of the as-ground inserts and to a lower surface Co concentration. 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 aluminum-matrix composite (Al-10%Al2O3 ) bars. Turning test results indicated that a proper combination of substrate pretreatment and microstructure can significantly improve tool life.

Original languageEnglish (US)
Pages (from-to)127-134
Number of pages8
JournalSurface and Coatings Technology
Volume166
Issue number2-3
DOIs
StatePublished - Mar 24 2003

Keywords

  • Diamond
  • Dry turning of MMC materials
  • Hot filament chemical vapour deposition
  • Scanning electron microscopy
  • Tungsten carbide

ASJC Scopus subject areas

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

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