447 Phase Evolution in Porcelain Stoneware by Infrared and Raman Spectroscopy

Friday, November 6, 2009: 4:40 PM
Pancho Villa (Camino Real Hotel)
Juan Serrato Rodríguez , Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Mich.,, Mexico
Simón Yobanny Reyes López , Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Mich.,, Mexico
Satoshi Sugita Sueyoshi , Departamento de Química, División de Ciencias Naturales y Exactas, Campus Guanajuato, Universidad de Guanajuato, Guanajuato, Gto, Mexico
Abstract
 Phase evolution in triaxial porcelain bodies was studied by infrared and Raman spectroscopy, and confirmed by SEM, X-ray diffractometry and DTA. Thermal transformations in kaolinite, anorthoclase and α-quartz raw materials, showed  dehydroxylation of kaolinite, anortoclase  to sanidine transformation, feldspars melting and reacting with clays to form mullite. The quartz IR overlapping drawbacks detection in particular the α-β quartz conversion at the 700-1300 cm-1 region  were overcome by the use of Raman spectroscopy.  The characteristic 1131, 994 absorption IR bands allowed mullite detection at 11500C. While the 1074, 790, 1131, 994 deconvoluton bands showed a glass and mullite increasing tendency as temperature changed from 1150 to 13000C. SEM gives evidence of the primary to secondary mullite transformation via topotactic and liquid phase crystallization respectively.