12. Reaction Sintered LiAlON

  1. Lisa Prokurat,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. Raymond A. Cutler and
  2. R. Marc Flinders

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291368.ch12

Advances in Ceramic Armor II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 7

Advances in Ceramic Armor II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 7

How to Cite

Cutler, R. A. and Flinders, R. M. (2006) Reaction Sintered LiAlON, in Advances in Ceramic Armor II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 7 (eds L. Prokurat, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291368.ch12

Author Information

  1. Ceramatec, Inc. 2425 South 900 West Salt Lake City, Utah 84119

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2006

ISBN Information

Print ISBN: 9780470080573

Online ISBN: 9780470291368

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Keywords:

  • lithium;
  • monitor phase changes;
  • lithium aluminate additions;
  • volume expansion;
  • reaction sintering

Summary

Recent results suggest that Li+ can substitute for Al3+ in the gamma-AlON structure. LiAlsOs is isostructural with gamma-AlON above 1290°C after it goes through an ordered-disordered phase transformation and has a similar lattice parameter. A previous study showed the benefits of reaction sintering LiAlON starting with LiAl5O8 as compared to using Li2O. The present study compared Li2O, LiAlO2, LiAl5O8, and LiAl11O17 at identical lithium levels when reaction sintering LiAlON using Al2O3 and AlN as the other reactants. X-ray diffraction was used to monitor phase changes as a function of sintering temperature. LiAlON formed by 1550°C in all lithium containing materials, with nearly full conversion by 1650°C, while AlON did not form until 1750°C under identical sintering conditions for the material without lithium. The starting source of the lithium did not control the ability to form LiAlON as was previously hypothesized. Lithia or lithium aluminate additions, however, are advantageous for reaction sintering Al2O3 and A1N since the volume expansion during sintering is avoided.