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Sintering and properties of Li2O · Al2O3 · 4SiO2-borosilicate glass composites

Published online by Cambridge University Press:  31 January 2011

Jiin-Jyh Shyu  and
Ching-Tang Wang
Jiin-Jyh Shyu
Affiliation:
Department of Materials Engineering, Tatung Institute of Technology, Taipei, Taiwan 104, Republic of China
Ching-Tang Wang
Affiliation:
Department of Materials Engineering, Tatung Institute of Technology, Taipei, Taiwan 104, Republic of China
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Abstract

Sintering, glass crystallization, microstructure, and the resulting properties of spodumene-borosilicate glass composites were investigated. Densities >90% could be obtained for samples sintered below 1000 °C. Samples that contained more low-viscosity glass densified at lower temperatures, and significant density reduction was observed at higher temperatures. Samples that contained high-viscosity glass densified only at higher temperatures. When glasses of different viscosity were added, the densification of the composites was improved. There was interdiffusion between spodumene and glass. Cristobalite crystallized from the pure glasses. Addition of spodumene changed the major phase crystallized to anorthite or α-quartz as a result of dissolution of spodumene into glass. Composites that contained glass of higher silica content showed more crystallization. As sintering temperatures increased, the amount of crystallization decreased, due to dissolution of glass into spodumene. The spodumene particles showed angular shape with smooth and straight sides. The spodumene-glass composites showed a dielectric constant in the range of 5–6, a loss tangent generally <1%, and a CTE value in the range of 2–5.6 × 10–6 K–1. Codoping of glasses with different viscosity effectively improved the densification and properties of the composites.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 10 , October 1996 , pp. 2518 - 2527
Copyright
Copyright © Materials Research Society 1996

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