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The Role of Glassy Grain Boundary Phases in the Microwave Joining of Alumina

Published online by Cambridge University Press:  15 February 2011

Pamela Davis ,
Jon Binner ,
Tom Cross  and
John Fernie
Pamela Davis
Affiliation:
Department of Materials Engineering and Materials Design
Jon Binner
Affiliation:
Department of Materials Engineering and Materials Design
Tom Cross
Affiliation:
Department of Electrical and Electronic Engineering, The University of Nottingham, University Park, Nottingham, UK
John Fernie
Affiliation:
TWI, Abington Hall, Abington, Cambridge, UK
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Abstract

The role of intergranular glassy phases in the microwave joining of alumina ceramic rods has been investigated. Alumina ceramics of different purities have been examined using a TE102 single mode rectangular resonant cavity operating at 2.45 GHz. Temperature and axial pressure were varied and the resultant join microstructures analyzed. The presence of a glassy grain boundary phase has been shown to improve the ability to microwave join alumina ceramics by increasing the dielectric loss of the ceramic and, when softened, by enabling the alumina grains to flow under the imposed load. Evidence has also been found for the sintering of individual grains where they have come into contact across the join line.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 347: Symposium O – Microwave Processing of Materials IV , 1994 , 655
Copyright
Copyright © Materials Research Society 1994

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References

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