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Título

Mullite development on firing in porcelain stoneware bodies

AutorMartín-Márquez, Jorge; Rincón López, Jesús María; Romero, Maximina
Palabras claveMullite
Porcelain stoneware
Microstructure
Electron microscopy
Traditional ceramics
Fecha de publicación2010
EditorElsevier
CitaciónJournal of the European Ceramic Society
ResumenMicrostructural 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.
Versión del editor10.1016/j.jeurceramsoc.2010.01.002
URIhttp://hdl.handle.net/10261/20640
DOI10.1016/j.jeurceramsoc.2010.01.002
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