Abstract
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.
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Abbreviations
- a, b :
-
Light absorption/scattering parameters, dimensionless
- a*, b*:
-
Orthogonal colour parameters, dimensionless
- c :
-
Volume concentration of pigment, %
- C*:
-
Chroma, dimensionless
- CTE:
-
Coefficient of thermal expansion (10−6 K−1)
- E :
-
Colour global parameter
- h :
-
Coating thickness, μm
- h*:
-
Hue, dimensionless
- h ∞ :
-
“Infinite” coating thickness, μm
- i :
-
Variable (dimensionless)
- K :
-
Light absorption, m−1
- KM:
-
Kubelka-Munk method
- L*:
-
Lightness of colour, dimensionless
- n :
-
Constant (dimensionless)
- P :
-
Colorimetric characteristic, dimensionless
- RGB:
-
Grassmann method
- S :
-
Light scattering, m−1
- Δ:
-
Difference between reference and experimental value
- λ:
-
Wavelength, nm
- μ:
-
Viscosity (Pa s)
- ρ*:
-
Corrected light reflectance (excluding specular effect) of the coating, dimensionless
- ρ:
-
Experimental light reflectance (including specular effect) of the coating, dimensionless
- ρ0 :
-
Experimental light reflectance of the substrate, dimensionless
- ρ0*:
-
Experimental light reflectance of the substrate, dimensionless
- ρ*∞ :
-
Corrected light reflectance of coating with “infinite thickness”
- Ψ:
-
Average difference between calculated and experimental reflectance spectra, dimensionless
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The authors thank Olivier Landemarre, Ghislaine Bertrand and Nilo Tozzi, for their technical support and assessment.
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Poirier, T., Bertrand, P. & Coddet, C. Colour Matching in Decorative Thermally Sprayed Glass Coatings. J Therm Spray Tech 22, 48–56 (2013). https://doi.org/10.1007/s11666-012-9848-9
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DOI: https://doi.org/10.1007/s11666-012-9848-9