Chapter 37. Crystallization Behavior and Properties of BaO · Al2O3 · 2SiO2 Glass Matrices

  1. John B. Wachtman Jr.
  1. Charles H. Drummond III1 and
  2. Narottam P. Bansal2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313008.ch37

A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8

A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8

How to Cite

Drummond, C. H. and Bansal, N. P. (1990) Crystallization Behavior and Properties of BaO · Al2O3 · 2SiO2 Glass Matrices, in A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313008.ch37

Author Information

  1. 1

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

  2. 2

    National Aeronautics and Space Administration Lewis Research Center Cleveland, OH 44135

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1990

ISBN Information

Print ISBN: 9780470374924

Online ISBN: 9780470313008

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Keywords:

  • thermal expansion coefficient;
  • aerospace propulsion;
  • crystallizes;
  • thermal expansion;
  • crystallization

Summary

Glass of stoichiometric celsian composition, BaO · Al2O3 · SiO2 has density of 3.39 g/cm3, thermal expansion coefficient of 6.6 × 106/°C, glass-transition temperature of 910°C, and dilatometric softening point of 925°C. On heat treatment, only hexacelsian crystallized out on the surface, but both celsian and hexacelsian were present in the bulk. Effects of cold isostatic pressing (CIP), sintering, and hot-pressing, in the presence and absence of an additive, on the formation of celsian phase in the glass have been studied. CIP'd samples, after appropriate heat treatments, always crystallized out as celsian, whereas presence of 5–10 wt% of an additive was necessary for formation of celsian in sintered as well as hot-pressed specimens. Green density increased with CIP'ing pressure but had no effect on sintered density. Hot-pressing resulted in fully dense samples.