Chapter 23. Crystallization and Properties of Sr-Ba Aluminosilicate Glass-Ceramic Matrices

  1. John B. Wachtman Jr
  1. Narottam P. Bansal1,
  2. Mark J. Hyatt1 and
  3. Charles H. Drummond III2

Published Online: 28 MAR 2008

DOI: 10.1002/9780470313831.ch23

Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 7/8

Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 7/8

How to Cite

Bansal, N. P., Hyatt, M. J. and Drummond, C. H. (1991) Crystallization and Properties of Sr-Ba Aluminosilicate Glass-Ceramic Matrices, in Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313831.ch23

Author Information

  1. 1

    NASA Lewis Research Center Cleveland, OH 44135

  2. 2

    Department of Materials Science and Engineering The Ohio State University Columbus, OH 43210

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1991

ISBN Information

Print ISBN: 9780470375099

Online ISBN: 9780470313831

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Keywords:

  • monoclinic;
  • ceramic;
  • hexacelsian;
  • temperatures;
  • polycrystalline

Summary

Powders of roller quenched (Sr,Ba)O·Al2O3·2SiO2 glasses of various compositions were uniaxially pressed into bars and hot isostatically pressed at 1350°C for 4 h or cold isostatically pressed and sintered at different temperatures between 800° to 1500°C for 10 or 20 h. Densities, flexural strengths, and linear thermal expansion were measured for three compositions. The glass transition and crystallization temperatures were determined by DSC. The liquidus and crystallization temperature from the melt were measured using high-temperature DTA. Crystalline phases formed on heat treatment of the glasses were identified by powder X-ray diffraction. In Sr-containing glasses, the monoclinic celsian phase always crystallized at temperatures above ≈1000°C. At lower temperatures, the hexagonal analogue formed. The temperature for orthorhombic-to-hexagonal structural transformation increased monotonically with SrO content, from 327°C for BaO·Al2O3·2SiO2 to 758°C for SrO·Al2O3·2SiO2. These glass powders can be sintered to almost full densities and monoclinic celsian phase at a relatively low temperature of 1100°C.