Investigations of the bonding layer in commercial CVD coated cemented carbide inserts

Zhi Jie Liu, Zi Kui Liu, Charles McNerny, Pankaj Mehrotra, Aharon Inspektor

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15 Scopus citations


The effects of processing parameters on the bonding layer structure between the cemented carbide substrate and the Al2 O3 coating were investigated by depositing thick bonding layers under commercial production conditions. Different from the belief in the literature that the bonding layer is a cubic Ti(C,N,O) phase, titanium oxides were observed. Energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) measurements were used to determine the compositions and structures of the bonding layer and the Al2 O3 layer. It was found that the α-Al2 O3 phase formed when there is a bonding layer, and the κ-Al2O3 phase formed without the bonding layer. Thermodynamic calculations were conducted to explore the effects of processing parameters on the formation of various oxides. It was suggested that the decomposition efficiency of the gas precursors plays a critical role in the formation of oxides.

Original languageEnglish (US)
Pages (from-to)161-164
Number of pages4
JournalSurface and Coatings Technology
Issue number1-3 SPEC. ISS.
StatePublished - Aug 1 2005

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


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