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Article
Effect of Long-term Heating and Thermal Cycling on Thermal Expansion, Phase Distribution and Microhardness of Lithium Aluminosilicate Glass-ceramics
Journal of Non-Crystalline Solids
  • Murat Bengisu
  • Richard K. Brow, Missouri University of Science and Technology
Abstract

Lithium aluminosilicate glass-ceramics prepared by two different devitrification procedures were subjected to thermal cycling and heat treatment at 700 and 800 °C for up to 16 days in air. Changes in microstructure, phase distribution, microhardness, and thermal expansion behavior were monitored. Glass-ceramics prepared with a 950 °C nucleation step were observed to have various advantages over those prepared with a 1000 °C nucleation treatment. These advantages include finer microstructure, higher microhardness, and an almost linear thermal expansion behavior in the as-devitrified state. Additionally, no significant changes in physical properties were detected in the 950 °C-devitrified samples, while 1000 °C-devitrified glass-ceramics were found to be thermally unstable, causing important property changes, jeopardizing their reliability.

Department(s)
Materials Science and Engineering
Keywords and Phrases
  • A165,
  • H120,
  • T145
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2003 Elsevier, All rights reserved.
Publication Date
12-1-2003
Publication Date
01 Dec 2003
Citation Information
Murat Bengisu and Richard K. Brow. "Effect of Long-term Heating and Thermal Cycling on Thermal Expansion, Phase Distribution and Microhardness of Lithium Aluminosilicate Glass-ceramics" Journal of Non-Crystalline Solids (2003) ISSN: 0022-3093; 1873-4812
Available at: http://works.bepress.com/richard-brow/43/