Chapter 5. Synthesis of Low-Firing Anorthite Powder by the Steric-Entrapment Route

  1. Hua-Tay Lin and
  2. Mrityunjay Singh
  1. Sang-Jin Lee1,
  2. Chung-Hyo Lee1 and
  3. Waltraud M. Kriven2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294741.ch5

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

How to Cite

Lee, S.-J., Lee, C.-H. and Kriven, W. M. (2008) Synthesis of Low-Firing Anorthite Powder by the Steric-Entrapment Route, in 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3 (eds H.-T. Lin and M. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294741.ch5

Author Information

  1. 1

    Dept. of Advanced Materials Science and Engineering, Mokpo National University, Muan 534–729, Korea

  2. 2

    Dept. of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375785

Online ISBN: 9780470294741

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Keywords:

  • polymerization;
  • crystallization;
  • densification;
  • microstructure;
  • crystallizable

Summary

A homogeneous and stable, amorphous-type, anorthite (CaO·Al2O3·2SiO2) powder was synthesized by an organic-inorganic steric entrapment route. Polyvinyl alcohol (PVA) was used as an organic carrier for the precursor ceramic gel. The PVA content, its degree of polymerization and type of silica sol had a significant influence on the calcination and crystallization behavior of the precursors. For densification and crystallization at low temperature, porous and soft, amorphous anorthite powder was planetary milled for 20 h. The milled powder crystallized to stable anorthite phase and densified to a relative density of 94% below 1000 d̀C. The low-firing anorthite ceramics were characterized for examination of microstructure, thermal expansion behavior and dielectric constant.