Chapter 23. Crystallization and Properties of Sr-Ba Aluminosilicate Glass-Ceramic Matrices
- John B. Wachtman Jr
Published Online: 28 MAR 2008
Copyright © 1991 The American Ceramic Society, Inc.
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
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1991
Print ISBN: 9780470375099
Online ISBN: 9780470313831
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.