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Processing Aerosols and Filaments in a TM010 Microwave Cavity at 2.45 GHz

Published online by Cambridge University Press:  25 February 2011

Gerald J. Vogt  and
Wesley P. Unruh
Gerald J. Vogt
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
Wesley P. Unruh
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
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Abstract

As part of the development of generic microwave processes for spray-drying of homogeneous complex metal oxide powders and for inorganic fiber processing, we have investigated the use of 2.45 GHz microwaves in a high-Q single-mode TM010 cavity coupled directly to aerosols and fibers. Aqueous and ethanol aerosols of ferric nitrate solutions have been successfully dried at 1.8 kW of cavity power for a loaded Q greater than 6000 in flowing nitrogen gas. Similarly, we have observed extremely rapid heating rates in the TM0l0 cavity for small-diameter confined cylinders of water and lossy inorganic fibers. These observations suggest using 2.45 GHz microwave power for drying, calcining, and sintering extruded ceramic filaments. Droplet modeling indicates that the large dielectric shielding for spherical droplets can significantly limit the coupling of 2.45 GHz microwave with spherical aerosols, but not with fibers. Experimental observations on the microwave interactions with ferric nitrate aerosols and with ceramic filaments in the TM010 cavity are described.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 269: Symposium L – Microwave Processing of Materials III , 1992 , 245
Copyright
Copyright © Materials Research Society 1992

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References

REFERENCES

1. Christiansen, D.E. and Unruh, W.P. in Microwaves: Theory and Application in Materials Processing, edited by Clark, D.E., Gac, F.D., and Sutton, W.H. (Ceramic Transactions, Vol. 21, American Ceramics Society, Westerville, OH, 1991) pp. 597–604.Google Scholar
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