Modernist enamels: composition, microstructure and stability

Date published

2019-11-13

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Volume Title

Publisher

Elsevier

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Article

ISSN

0955-2219

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Citation

Beltrán M, Schibille N, Brock F, et al, (2019) Modernist enamels: composition, microstructure and stability. Journal of the European Ceramic Society, Volume 40, April 2019, pp. 1753-1766

Abstract

Coloured enamels from the materials used in Modernist workshops from Barcelona were produced and compared to those found in the buildings to explore the reason for the reduced stability of the blue and green enamels.

They were made of a lead-zinc borosilicate glass with a low softening point, reasonable stability to corrosion and matching thermal expansion coefficient with the blown base glass, mixed with colourants and pigment particles. The historical enamels show a lead, boron and zinc depleted silica rich amorphous glass, with precipitated lead and calcium sulphates or carbonates, characteristic of extensive atmospheric corrosion. The blue and green enamels show a heterogeneous layered microstructure more prone to degradation which is augmented by a greater heating and thermal stress affectation produced by the enhanced Infrared absorbance of blue tetrahedral cobalt colour centres and copper ions dissolved in the glass and, in particular, of the cobalt spinel particles.

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Github

Keywords

atmospheric corrosion, microstructure, pigments, colourants, borosilicate glass, Zinc, Lead

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Attribution-NonCommercial-NoDerivatives 4.0 International

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