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X-ray diffraction Warren–Averbach mullite analysis in whiteware porcelains: influence of kaolin raw material

Published online by Cambridge University Press:  04 September 2018

Angel Sanz
Affiliation:
Unidad Departamental de Geología, Universidad de Valencia, Campus de Burjassot, 46100 Burjassot, Valencia, Spain
Joaquín Bastida*
Affiliation:
Unidad Departamental de Geología, Universidad de Valencia, Campus de Burjassot, 46100 Burjassot, Valencia, Spain
Angel Caballero
Affiliation:
Instituto de Cerámica y Vidrio (CSIC), Campus de Cantoblanco, 28049 Madrid, Spain
Marek Kojdecki
Affiliation:
Instytut Matematyki i Kryptologii, Wojskowa Akademia Techniczna, 00-908 Warszawa 49, Poland
*

Abstract

Compositional and microstructural analysis of mullites in porcelain whitewares obtained by the firing of two blends of identical triaxial composition using a kaolin B consisting of ‘higher-crystallinity’ kaolinite or a finer halloysitic kaolin M of lower crystal order was performed. No significant changes in the average Al2O3 contents (near the stoichiometric composition 3:2) of the mullites were observed. Fast and slow firing at the same temperature using B or M kaolin yielded different mullite contents. The Warren–Averbach method showed increase of the D110 mullite crystallite size and crystallite size distributions with small shifts to greater values with increasing firing temperature for the same type of firing (slow or fast) using the same kaolin, as well as significant differences between fast and slow firing of the same blend at different temperatures for each kaolin. The higher maximum frequency distribution of crystallite size observed at the same firing temperature using blends with M kaolin suggests a clearer crystallite growth of mullite in this blend. The agreement between thickening perpendicular to prism faces and mean crystallite sizes <D110> of mullite were not always observed because the direction perpendicular to 110 planes is not preferred for growth.

Type
Article
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Guest Associate Editor: N. Fagel

This paper was originally presented during the session: ‘CZ-01 – Clays for ceramics’ of the International Clay Conference 2017.

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