Journal of Thermal Spray Technology

, Volume 22, Issue 1, pp 48–56 | Cite as

Colour Matching in Decorative Thermally Sprayed Glass Coatings

  • Thierry Poirier
  • Pierre Bertrand
  • Christian Coddet
Peer Reviewed


Coloured coatings were obtained on steel by plasma spraying without severe in-flight alteration of pigments, taking profit of the low thermal conductivity of the glassy matrix of glaze particles. Colour matching was studied by mixing 3 different glazes, comparing Grassmann and Kubelka-Munk based algorithms. Results suggest that the latter method should be preferred upon Grassmann method, particularly when the light absorption/dispersion ratios of coloured feedstocks are very different.


atmospheric plasma spray (APS) colour glass optical spectroscopy 

List of Symbols

a, b

Light absorption/scattering parameters, dimensionless

a*, b*

Orthogonal colour parameters, dimensionless


Volume concentration of pigment, %


Chroma, dimensionless


Coefficient of thermal expansion (10−6 K−1)


Colour global parameter


Coating thickness, μm


Hue, dimensionless


“Infinite” coating thickness, μm


Variable (dimensionless)


Light absorption, m−1


Kubelka-Munk method


Lightness of colour, dimensionless


Constant (dimensionless)


Colorimetric characteristic, dimensionless


Grassmann method


Light scattering, m−1

Greek Symbols


Difference between reference and experimental value


Wavelength, nm


Viscosity (Pa s)


Corrected light reflectance (excluding specular effect) of the coating, dimensionless


Experimental light reflectance (including specular effect) of the coating, dimensionless


Experimental light reflectance of the substrate, dimensionless


Experimental light reflectance of the substrate, dimensionless


Corrected light reflectance of coating with “infinite thickness”


Average difference between calculated and experimental reflectance spectra, dimensionless


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Copyright information

© ASM International 2012

Authors and Affiliations

  • Thierry Poirier
    • 1
  • Pierre Bertrand
    • 2
  • Christian Coddet
    • 2
  1. 1.Grupo de Ingeniería de SuperficiesUniversidad Simón BolívarCaracasVenezuela
  2. 2.LERMPS, UTBMBelfort cedexFrance

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