Chapter 18. Processing and Sintering of Sol-Gel Derived Lithium Aluminosilicate Powders

  1. John B. Wachtman Jr.
  1. R. Ross Haghighat1,
  2. Debra Treacy1,
  3. Carlo G. Pantano2 and
  4. Lisa C. Klein3

Published Online: 26 MAR 2008

DOI: 10.1002/9780470310557.ch18

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

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

Author Information

  1. 1

    Foster-Miller, Inc. Waltham, MA

  2. 2

    Pennsylvania State University University Park, PA

  3. 3

    Rutgers University Piscataway, NJ

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780470374863

Online ISBN: 9780470310557

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Keywords:

  • oxide systems;
  • lithium methoxide;
  • chemical vapor infiltration;
  • sic whiskers;
  • sol-gel techniques

Summary

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.