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Chemical processing and densification characteristics of lithium aluminosilicate (LAS) gels

Published online by Cambridge University Press:  31 January 2011

Hyun M. Jang ,
Kwang S. Kim  and
Chang J. Jung
Hyun M. Jang*
Affiliation:
Department of Materials Science and Engineering, and Advanced Ceramics Processing Science Laboratory, Pohang Institute of Science and Technology (POSTECH), Pohang 790-784, Korea
Kwang S. Kim
Affiliation:
Department of Inorganic Materials Engineering, College of Engineering, Chonnam National University, Kwang-Joo, Korea
Chang J. Jung
Affiliation:
Department of Inorganic Materials Engineering, College of Engineering, Chonnam National University, Kwang-Joo, Korea
*
a)Address correspondence to this author.
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Abstract

Two different chemical processing routes were successfully used for the fabrication of lithium aluminosilicate (LAS) specimens having dense and homogeneous microstructure with an essentially pore-free state. These are (i) sol-gel route using the hydrolysis-condensation reaction of metal alkoxides and (ii) mixed colloidal processing route. Lowering Li content in the sol-gel-derived LAS significantly enhanced densification and retarded the crystallization. The β-spodumene (∼0.8 μm) seeding in the sol-gel-derived LAS modified the sequence of phase transformations and lowered the crystallization temperature by 120 °C. Therefore, combining the epitaxial seeding with the sol-gel process, one can bring down the crystallization temperature to the sintering temperature range (∼800 °C). Similarly, the LAS gel prepared by the mixed colloidal processing route exhibited a noticeable shrinkage over a broad temperature range (600–950 °C) and produced a dense sintered body with an essentially pore-free microstructure.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 8 , August 1992 , pp. 2273 - 2280
Copyright
Copyright © Materials Research Society 1992

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