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The Microwave Heating Behaviour of Metallic-Insulator Composite Systes

Published online by Cambridge University Press:  28 February 2011

Claude P. Lorenson ,
Mel D. Ball ,
Ralph Herzig  and
Hamish Shaw
Claude P. Lorenson
Affiliation:
Alcan International Limited, Kingston Research & Development Centre, P.O. Box 8400. Kingston, Ontario, Canada K7L-5L9
Mel D. Ball
Affiliation:
Alcan International Limited, Kingston Research & Development Centre, P.O. Box 8400. Kingston, Ontario, Canada K7L-5L9
Ralph Herzig
Affiliation:
Alcan International Limited, Kingston Research & Development Centre, P.O. Box 8400. Kingston, Ontario, Canada K7L-5L9
Hamish Shaw
Affiliation:
Alcan International Limited, Kingston Research & Development Centre, P.O. Box 8400. Kingston, Ontario, Canada K7L-5L9
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Abstract

The microwave heating behaviour of composite systems is of considerable interest for theprocessing of ceramics or the creation of materials with interesting dielectric properties. In this investigation, the heating response of different mixtures of metallic and insulating powders is described. The heating rate as a function of metal type, mass fraction and powder types will be presented for pressed pellet samples.

From the results, three distinct heating regimes have been identified. At low temperatures. induced electric currents cause the metal particles to heat. As the temperature increases, exothermic oxidation of the metal powder particles increases the heating rate. Eventually, the insulating powder (alumina) begins to absorb microwave energy more efficiently and this dominates the high temperature behaviour. The relative importance of thesethree effects for different temperatures depends on the particular powders which are used.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 189: Symposium L – Microwave Processing of Materials II , 1990 , 279
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

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