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Sintering of Glass Powder Packings with Metal Inclusions

Published online by Cambridge University Press:  25 February 2011

A. Jagota ,
E.D. Boyes  and
R.K. Bordia
A. Jagota
Affiliation:
The DuPont Company, Central Research, Experimental Station, P.O. Box 80356-347, Wilmington, Delaware 19880-0356.
E.D. Boyes
Affiliation:
The DuPont Company, Central Research, Experimental Station, P.O. Box 80356-347, Wilmington, Delaware 19880-0356.
R.K. Bordia
Affiliation:
The DuPont Company, Central Research, Experimental Station, P.O. Box 80356-347, Wilmington, Delaware 19880-0356.
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Abstract

The sintering of glass powder packings with metal inclusions has been studied using (a) a loading dilatometer, and (b) an in-situ SEM hot-stage. The addition of a small volume fraction of metal particles unexpectedly increases the sintering rate of the composite. With a further increase in the volume fraction of inclusions the sintering rate decreases rapidly to zero at a well-defined threshold. The in-situ sintering experiments have been used to observe the sintering mechanisms and to determine the parameters that contribute to this phenomenon: to assess the distribution of inclusions, and the nature of inclusion-inclusion and matrix-inclusion interaction. Predictions of the effective sintering rate are computed using a truss model with randomly distributed inclusions. The computations capture accurately the decrease in sintering rate (beyond the initial increase) with increasing volume fraction of inclusions. The initial increase is attributed to a reduction in viscosity of the glass due to chemical interaction with the metal.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 249: Symposium Q – Synthesis and Processing of Ceramics: Scientific Issues , 1991 , 475
Copyright
Copyright © Materials Research Society 1992

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References

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