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Effect of aluminium sulphate on phase formation and morphology development of mullite whiskers

Published online by Cambridge University Press:  09 July 2018

Hongbin Tan
Hongbin Tan*
Affiliation:
School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong Shaanxi 723003, People's Republic of China
*
*E-mail: hb-t@163.com
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Abstract

Well developed mullite whiskers were obtained by heating compacts of kaolin and 2 wt.% sodium pyrophosphate powder at 1350ºC for 10 h, with or without a small addition of aluminium sulphate. Without aluminium sulphate, mullite whiskers were obtained with an aspect ratio of >8 and reasonably uniform diameter (~0.05–0.3 μm). When aluminium sulphate additions were employed a mass of relatively well developed and interlocked whisker-shaped crystals were produced, with an aspect ratio of >10 (~0.05–0.3 μm in diameter). Larger whiskers were also observed, with aspect ratio of >25 (~0.2–0.5 μm in diameter).

Keywords

mullitewhiskerskaolinmorphology developmentaluminium sulphate
Type
Research Article
Information
Clay Minerals , Volume 45 , Issue 3 , September 2010 , pp. 349 - 352
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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