Abstract

Ceramic claddings on building facades not only present functional qualities and good resistance; they also add value to the architecture due to their qualities of light reflection, gloss and iridescence. The colour ranges produced by some enamel application techniques can vary widely. They change depending on one’s angle of vision and movement, colours in the surroundings, sunlight and their angle of incidence. In addition, the iridescent-pearl effect produced by light diffraction can lead to beautiful goniochromatic colours. This study analyses the production of square tiles of stoneware manufactured by extrusion, and their application to the Faculty of Education of the University of Alicante (FEUA) (Spain). Applying an enamel containing zirconium silicate ZrSiO4 and other metals such as Zn and Al produces iridescence-like effects. The physical-chemical properties of enamel and gloss values were characterised. A colorimetric characterisation was conducted by evaluating goniochromatic or iridescent colours, measuring the light’s spectral radiance factor, and comparing these results with other ceramic tiles of marked iridescent effects, with the presence of a final layer of anatase TiO2 enamel.

Highlights

  • In recent decades, the ceramics industry has undergone a renewal, regaining its innovative and technological nature

  • This study focuses on the iridescence of the ceramic tiles that cover the entrance to the Faculty of Education building of the University of Alicante (FEUA), which was recently renovated in 2018

  • This study focused on the comparative analysis of the ceramic tiles used in the renovation of the FEUA, and their relationship with light

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Summary

Introduction

The ceramics industry has undergone a renewal, regaining its innovative and technological nature. After a period of being applied almost exclusively to bathrooms and kitchens, porcelain stoneware and enamelled ceramics are being used for cladding, especially on building facades [1]. This recovery has led to further developments of construction solutions that use ceramics to meet new functional, aesthetic and economic requirements in architecture [2]. Ahmad et al reinforce ceramics with carbon nanostructures (CNTs and graphene) They have successfully enhanced the toughness and other properties of brittle ceramics and converted them into useful materials for generation applications [4].

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