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Effect of alumina on densification of binary borosilicate glass composite

Published online by Cambridge University Press:  03 March 2011

Jau-Ho Jean  and
Tapan K. Gupta
Jau-Ho Jean
Affiliation:
Alcoa Electronic Packaging, Inc., Alcoa Center, Pennsylvania 15069
Tapan K. Gupta
Affiliation:
Alcoa Electronic Packaging, Inc., Alcoa Center, Pennsylvania 15069
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Abstract

The effect of alumina on densification of the binary borosilicate glass composite, containing low-softening borosilicate glass (BSG) and high-softening high silica (HSG) glass, has been investigated. It is found that with a small amount of alumina, 2-10 vol. %, present as a dopant in the binary glass mixture of BSG and HSG, both densification and densification rate are significantly reduced, but the activation energy of densification at a given densification is dramatically increased. However, no significant change in densification behavior with increasing alumina content from 2 to 10 vol. % is observed. These results are attributed to a chemical reaction taking place at the interface of alumina/BSG, forming a reaction layer adjacent to alumina. Since the composition of the reaction layer is known to be rich in aluminum and alkali ions and poor in silicon, the alkali ions content in BSG is continuously decreased during sintering. Accordingly, the resultant loss of alkali ions from BSG causes a rise in viscosity of BSG, thus slowing down the densification kinetics and increasing the activation energy of densification.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 8 , August 1994 , pp. 1990 - 1996
Copyright
Copyright © Materials Research Society 1994

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References

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