Chapter 18. Processing and Sintering of Sol-Gel Derived Lithium Aluminosilicate Powders
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1989 The American Ceramic Society, Inc.
A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 7/8
How to Cite
Haghighat, R. R., Treacy, D., Pantano, C. G. and Klein, L. C. (1989) Processing and Sintering of Sol-Gel Derived Lithium Aluminosilicate Powders, in A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470310557.ch18
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1989
Print ISBN: 9780470374863
Online ISBN: 9780470310557
- oxide systems;
- lithium methoxide;
- chemical vapor infiltration;
- sic whiskers;
- sol-gel techniques
The goals of this research are threefold: a) production of lithium aluminosilicate (LAS) glass-ceramics via a sol-gel process, b) densification to near theoretical density without hot-pressing; and c) fabrication of dense, SiC whisker-reinforced LAS composites with greater than 25 vol% whisker content. This paper discusses the first two aspects of this research; the work on densification of whisker-reinforced LAS composites will be reported at a future date. Three sol-gel approaches were investigated to produce β-Eucryptite LAS glass-ceramics. These approaches differed in the oxide precursors used for processing. Cast xerogels and ultrafine powders of 1:1:2 Li2O:Al2O3:SiO2 β-Eucryptite were successfully produced. The most successful technique was an all-alkoxide approach in which an alcoholic solution of tetraethoxysilane (TEOS), aluminum sec-butoxide (ASB), and lithium methoxide were combined. Greater than 90% of theoretical density was achieved from cold pressed and sintered β-Eucryptite oxide powders. X-ray diffraction analysis indicated crystallization had occurred in all the sintered samples.