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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    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.",
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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