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Open Access item Mullite development on firing in porcelain stoneware bodies

Authors:Martín-Márquez, Jorge
Rincón López, Jesús María
Romero, Maximina
Keywords:Mullite, Porcelain stoneware, Microstructure, Electron microscopy, Traditional ceramics
Issue Date:2010
Publisher:Elsevier
Citation:Journal of the European Ceramic Society
Abstract:Microstructural evolution on heating was investigated in a reference industrial composition (50% kaolinitic clay, 40% feldspar and 10% quartz) of porcelain stoneware, fast fired at different temperatures (500º-1400ºC). The evolution of mullite crystals, regarding shape and size progress, was examined by scanning electron microscopy (SEM). The proportion of Type I mullite crystals decreases with firing temperature and simultaneously, the size of crystals increases, reaching the maximum value of aspect ratio (3:1) at 1400ºC. Type II and Type III secondary mullite needles increase with temperature in both number and length, which leads to an increase in the aspect ratio from 5:1 to ~20:1 in Type II crystals and from ~33: to 50:1 in Type III mullite needles. Finally, clusters of Type III mullite fibres are observed in porcelain stoneware samples fast fired in the 1250-1280ºC interval.
Publisher version (URL):10.1016/j.jeurceramsoc.2010.01.002
URI:http://hdl.handle.net/10261/20640
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