Effect of substrates on the microstructure of thermally sprayed WC-4.88 wt% Co coatings

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Aluminium, 304L stainless steel, super-invar and brass substrates were coated with WC-4.88wt%Co using the High Velocity Oxyl-Fuel (HVOF) technique. Microstructure and phase identification studies were done using optical microscopy, scanning electron microscopy, X-ray diffraction and atomic force microscopy. X-ray residual stress and microhardness measurements were also undertaken. Porosity and grain sizes were determined. From the X-ray diffraction spectra of the sprayed coatings, differences in the phases present for each coated substrate were observed. The coatings had similar microhardnesses within experimental error. The residual stress results were different for each coating sprayed onto different substrates. These differences were interpreted as originating from the different specific heat capacities and coefficients of linear thermal expansion of the substrates.

Original languageEnglish
Title of host publicationProceedings of the World Powder Metallurgy Congress and Exhibition, World PM 2010
PublisherEuropean Powder Metallurgy Association (EPMA)
Volume3
ISBN (Print)9781899072194
Publication statusPublished - 2010
EventWorld Powder Metallurgy Congress and Exhibition, World PM 2010 - Florence, Italy
Duration: Oct 10 2010Oct 14 2010

Other

OtherWorld Powder Metallurgy Congress and Exhibition, World PM 2010
CountryItaly
CityFlorence
Period10/10/1010/14/10

Fingerprint

coatings
Coatings
microstructure
Microstructure
sprayed coatings
Sprayed coatings
Substrates
Microhardness
microhardness
Specific heat
residual stress
Residual stresses
specific heat
X ray diffraction
x rays
stress measurement
brasses
Stainless Steel
Brass
Aluminum

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Ceramics and Composites
  • Materials Chemistry
  • Metals and Alloys
  • Condensed Matter Physics

Cite this

Oladijo, O. P., Venter, A. M., Cornish, L. A., Sacks, N., & Shrivastava, S. (2010). Effect of substrates on the microstructure of thermally sprayed WC-4.88 wt% Co coatings. In Proceedings of the World Powder Metallurgy Congress and Exhibition, World PM 2010 (Vol. 3). European Powder Metallurgy Association (EPMA).
Oladijo, O. P. ; Venter, A. M. ; Cornish, L. A. ; Sacks, N. ; Shrivastava, S. / Effect of substrates on the microstructure of thermally sprayed WC-4.88 wt% Co coatings. Proceedings of the World Powder Metallurgy Congress and Exhibition, World PM 2010. Vol. 3 European Powder Metallurgy Association (EPMA), 2010.
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Oladijo, OP, Venter, AM, Cornish, LA, Sacks, N & Shrivastava, S 2010, Effect of substrates on the microstructure of thermally sprayed WC-4.88 wt% Co coatings. in Proceedings of the World Powder Metallurgy Congress and Exhibition, World PM 2010. vol. 3, European Powder Metallurgy Association (EPMA), World Powder Metallurgy Congress and Exhibition, World PM 2010, Florence, Italy, 10/10/10.

Effect of substrates on the microstructure of thermally sprayed WC-4.88 wt% Co coatings. / Oladijo, O. P.; Venter, A. M.; Cornish, L. A.; Sacks, N.; Shrivastava, S.

Proceedings of the World Powder Metallurgy Congress and Exhibition, World PM 2010. Vol. 3 European Powder Metallurgy Association (EPMA), 2010.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - Aluminium, 304L stainless steel, super-invar and brass substrates were coated with WC-4.88wt%Co using the High Velocity Oxyl-Fuel (HVOF) technique. Microstructure and phase identification studies were done using optical microscopy, scanning electron microscopy, X-ray diffraction and atomic force microscopy. X-ray residual stress and microhardness measurements were also undertaken. Porosity and grain sizes were determined. From the X-ray diffraction spectra of the sprayed coatings, differences in the phases present for each coated substrate were observed. The coatings had similar microhardnesses within experimental error. The residual stress results were different for each coating sprayed onto different substrates. These differences were interpreted as originating from the different specific heat capacities and coefficients of linear thermal expansion of the substrates.

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Oladijo OP, Venter AM, Cornish LA, Sacks N, Shrivastava S. Effect of substrates on the microstructure of thermally sprayed WC-4.88 wt% Co coatings. In Proceedings of the World Powder Metallurgy Congress and Exhibition, World PM 2010. Vol. 3. European Powder Metallurgy Association (EPMA). 2010