Effect of substrate on the 3 body abrasion wear of HVOF WC-17 wt.% Co coatings

O. P. Oladijo, N. Sacks, L. A. Cornish, A. M. Venter

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

WC-17 wt.% Co coatings were deposited using high velocity oxy-fuel (HVOF) spraying onto four different substrate materials, namely aluminium, brass, 304 stainless steel and super-invar. These substrates have different coefficients of thermal expansion which have been shown to influence the final coating microstructural properties. The abrasive wear properties of the coatings were characterised using an ASTM-G65 three body abrasive wear machine with silica sand as the abrasive. The highest mass loss was recorded for the coating on the aluminium substrate whilst the coated 304 stainless steel showed the lowest mass loss. The coatings on brass and super invar experienced similar mass losses. SEM studies of the worn surfaces showed preferential removal of the Co binder phase as well as cracking and rounding of the carbide grains. The differences in wear behaviour may be attributed to the presence of residual stresses where the highest compressive residual stress led to the highest wear rate. The coatings deposited onto brass showed compressive stresses whilst those deposited onto super-invar had tensile stresses, yet these two coatings had similar wear rates. Thus further study is required to provide conclusive evidence of the role of residual stresses on the abrasion resistance of these coatings.

Original languageEnglish
Pages (from-to)288-294
Number of pages7
JournalInternational Journal of Refractory Metals and Hard Materials
Volume35
DOIs
Publication statusPublished - Nov 1 2012

Fingerprint

Abrasion
Wear of materials
Coatings
Substrates
Brass
Residual stresses
Stainless Steel
Aluminum
Compressive stress
Stainless steel
Silica sand
Spraying
Abrasives
Tensile stress
Wear resistance
Binders
Thermal expansion
Carbides
Scanning electron microscopy
brass

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

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Effect of substrate on the 3 body abrasion wear of HVOF WC-17 wt.% Co coatings. / Oladijo, O. P.; Sacks, N.; Cornish, L. A.; Venter, A. M.

In: International Journal of Refractory Metals and Hard Materials, Vol. 35, 01.11.2012, p. 288-294.

Research output: Contribution to journalArticle

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