We present and discuss the effects in sanitary-ware ceramic mixtures induced by partial replacement of raw materials with alumina, or andalusite, on i) phase composition, ii) Gibbs energy of formation (∆G), iii) microstructures and iv) some reference technological properties. Measurements were carried out by X-ray powder diffraction, scanning electron microscopy, synchrotron X-ray computed micro-tomography, linear dilatometry, water absorption and mechanical testing. The results show that the introduction of alumina affects phase composition of the ceramic output as a function of the replacement scheme, leading to a mullite-ceramic glass quasi-equilibrium whose ∆G ranges from -32 to -14 kJ·mol-1. Although alumina modestly participates in the ceramic reactions, it yet influences surface microstructures, giving relevant whiteness, and some reference technological properties, providing low deformation and high flexural strength. The resulting ceramic material exhibits performances that lie in between those from fireclay and vitreous technologies, providing aesthetic improvements and high shape stability.

Effects of alumina-excess on reactivity, microstructure and macroscopic properties of sanitary-ware ceramics / V. Diella, N. Marinoni, E. Costa, P.G. Biraghi, F. Francescon, G. Lanzafame, M. Dapiaggi, A. Pavese. - In: CERAMICS IN MODERN TECHNOLOGIES. - ISSN 2612-4408. - (2019 Jul). [Epub ahead of print] [10.29272/cmt.2019.0011]

Effects of alumina-excess on reactivity, microstructure and macroscopic properties of sanitary-ware ceramics

N. Marinoni;M. Dapiaggi;A. Pavese
2019

Abstract

We present and discuss the effects in sanitary-ware ceramic mixtures induced by partial replacement of raw materials with alumina, or andalusite, on i) phase composition, ii) Gibbs energy of formation (∆G), iii) microstructures and iv) some reference technological properties. Measurements were carried out by X-ray powder diffraction, scanning electron microscopy, synchrotron X-ray computed micro-tomography, linear dilatometry, water absorption and mechanical testing. The results show that the introduction of alumina affects phase composition of the ceramic output as a function of the replacement scheme, leading to a mullite-ceramic glass quasi-equilibrium whose ∆G ranges from -32 to -14 kJ·mol-1. Although alumina modestly participates in the ceramic reactions, it yet influences surface microstructures, giving relevant whiteness, and some reference technological properties, providing low deformation and high flexural strength. The resulting ceramic material exhibits performances that lie in between those from fireclay and vitreous technologies, providing aesthetic improvements and high shape stability.
alumina-excess; fundamental reaction in sanitary-ware ceramics; modified sanitary-ware technology; multi-methodical experimental approach
Settore GEO/06 - Mineralogia
   Mineral Reactivity in Large-scale Processes (MiReLaP)
   MiReLaP
   MINISTERO DELL'ISTRUZIONE E DEL MERITO
   2017L83S77_003
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/692790
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