Influence of firing temperature and mineralogical composition on bending strength and porosity of ceramic tile bodies

Jordán Vidal, Manuel Miguel; Montero, María Adriana; Meseguer Costa, Sergio; Sanfeliu Montolio, Teófilo

Influence of firing temperature and mineralogical composition on bending strength and porosity of ceramic tile bodies

2008

Jordán Vidal, Manuel Miguel | Montero, María Adriana | Meseguer Costa, Sergio | Sanfeliu Montolio, Teófilo

This study is focussed on the behaviour of ceramic clays from the area around Castellon (Spain) having a large ceramic industry. Test samples have been prepared by extrusion and firing in the range of 800-1150 °C. Analysis of the fired samples was carried out by X-ray diffraction. The results from the study of mineralogical transformations show the persistence of illite up to at least 900 °C. From the destruction of illite, an intermediate phase between spinel and hercynite originates. Mixtures of illitic clays containing CaCO<sub>3</sub> form gehlenite, wollastonite and anorthitic plagioclases from 950 °C onwards. Quartz and hematites are present in samples poor in CaCO<sub>3</sub>. The optimum firing temperature for each sample has been established. The maximum bending strength of each ceramic body has been determined. Porosity-strength relations have been established. © 2008 Elsevier B.V. All rights reserved.

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