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Finite-Difference Time-Domain Simulation of Microwave Sintering in A Variable-Frequency Multimode Cavity

Published online by Cambridge University Press:  10 February 2011

Mikel J White ,
Steven F. Dillon ,
Magdy F. Iskander  and
Hal D. Kimrey
Mikel J White
Affiliation:
Electrical Engineering Department, University of Utah, Salt Lake City, UT 84112
Steven F. Dillon
Affiliation:
Electrical Engineering Department, University of Utah, Salt Lake City, UT 84112
Magdy F. Iskander
Affiliation:
Electrical Engineering Department, University of Utah, Salt Lake City, UT 84112
Hal D. Kimrey
Affiliation:
Oak Ridge National Laboratories, Oak Ridge, TN 37831
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Abstract

There have been recent indications that variable-frequency microwave sintering of ceramics provides several advantages over single-frequency sintering, including more uniform heating, particularly for larger samples. The Finite-Difference Time-Domain (FDTD) code at the University of Utah was modified and used to simulate microwave sintering using variable frequencies and was coupled with a heat-transfer code to provide a dynamic simulation of this new microwave sintering process. This paper summarizes results from the FDTD simulations of sintering in a variable-frequency cavity. FDTD simulations were run in 100-MHz steps to account for the frequency variation in the electromagnetic fields in the multimode cavity. It is shown that a variable-frequency system does improve the heating uniformity when the proper frequency range is chosen. Specifically, for a single ceramic sample (4 × 4 × 6 cm3), and for a variable-frequency range from f = 2.5 GHz to f = 3.2 GHz, the temperature distribution pattern was much more uniform than the heating pattern achieved when using a single-frequency sintering system at f = 2.45 GHz.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 430: Symposium O – Microwave Processing of Materials V , 1996 , 487
Copyright
Copyright © Materials Research Society 1996

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References

[1] Iskander, M.F., Smith, R.L., Andrade, O., Kimrey, H., and Walsh, L., IEEE Tran. On Microwave Theory and Tech., Vol.42, pp. 793–800, May 1994 Google Scholar
[2] Iskander, M.F. in Microwave Processing of Materials II, edited by Snyder, W.B. Jr., Sutton, W.H., Iskander, M.F., and Johnson, D.L. (Mater. Res. Soc. Proc. 189, San Francisco, CA, 1990) pp. 149–171.Google Scholar
[3] Subirats, M., Iskander, M.F., White, M. J, and Kiggans, J., presented ant the 1996 Spring Meeting, San Francisco, CA, 1996 (unpublished).Google Scholar
[4] Garard, Richard S., Billy Wei, J., and Zak Fathi in 30th Microwave Power Symposium, (IMPI Proc. 30, Denver CO, 1995) pp. 22–24.Google Scholar