Performance characterization of metallic substrates coated by HVOF WC-Co

Andrew M. Venter, O. Philip Oladijo, Vladimir Luzin, Lesley A. Cornish, Natasha Sacks

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Integral to the performance of high-velocity oxygen-fuel (HVOF) coatings is the thermo-mechanical interaction associated with the thermal misfit, or differences in thermal expansion coefficients (CTEs), between coating and substrate. This investigation reports results on the microstructures, chemical phase content, coating-substrate misfit residual stress, and wear resistance. For this purpose a systematic characterization of WC-Co sprayed coatings on a number of substrates covering a range of CTE values were pursued for both the as-coated and heat-treated conditions. The neutron diffraction technique in conjunction with sub-millimeter sized gauge volumes enabled depth-resolved studies of the stress in the coatings and substrates by paying special attention to the determination of the stress contribution attributed by the final spray process. In the as-coated condition the stress values in the coatings were compressive for CTEs larger than that of WC-Co and tensile for CTE lower than WC-Co. Wear resistance increased for increased compressive stress and macrohardness. In the heat-treated condition, this trend became enhanced due to increased compressive stress in the coatings.

Original languageEnglish
Pages (from-to)330-339
Number of pages10
JournalThin Solid Films
Volume549
DOIs
Publication statusPublished - Dec 31 2013

Fingerprint

Oxygen
coatings
Coatings
oxygen
Substrates
wear resistance
Compressive stress
Wear resistance
heat
sprayed coatings
Sprayed coatings
residual stress
sprayers
neutron diffraction
coating
Neutron diffraction
thermal expansion
coverings
Gages
Thermal expansion

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Venter, Andrew M. ; Oladijo, O. Philip ; Luzin, Vladimir ; Cornish, Lesley A. ; Sacks, Natasha. / Performance characterization of metallic substrates coated by HVOF WC-Co. In: Thin Solid Films. 2013 ; Vol. 549. pp. 330-339.
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Performance characterization of metallic substrates coated by HVOF WC-Co. / Venter, Andrew M.; Oladijo, O. Philip; Luzin, Vladimir; Cornish, Lesley A.; Sacks, Natasha.

In: Thin Solid Films, Vol. 549, 31.12.2013, p. 330-339.

Research output: Contribution to journalArticle

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AU - Venter, Andrew M.

AU - Oladijo, O. Philip

AU - Luzin, Vladimir

AU - Cornish, Lesley A.

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PY - 2013/12/31

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