Hostname: page-component-8448b6f56d-cfpbc Total loading time: 0 Render date: 2024-04-24T12:23:34.528Z Has data issue: false hasContentIssue false
  • English
  • Français

Fundamentals of Microwave-Material Interactions and Sintering

Published online by Cambridge University Press:  21 February 2011

Wayne R. Tinga
Wayne R. Tinga*
Affiliation:
Department of Electrical Engineering, 238 Civil/Electrical Building, University of Alberta, Edmonton, Alberta, T6G 2G7, Canada
Get access

Abstract

Basic interaction mechanisms are shown to depend strongly on the dielectric and magnetic properties of a process material. This causes a strong dependence of power absorption on frequency, material particle size, shape, temperature, and density. Sintering dynamics cause the microstructure of the treated material to change resulting in a change in microwave (1W) heating uniformity and rate. The concept of dielectric mixtures is introduced to predict the dielectric and heating properties of a host material with its inclusions in the form of shells, ellipsoids, spheres, disks and needles. Simplified models are described to give a process designer some insight into the behavior of MW sintering. Microwave power, by its very nature, gives better heating control and efficiency and provides internal heat to aid the material transport during sintering. No inherent temperature limit exists for MW sintering although refractory materials used to contain the process material create an artificial upper limit. It is shown that very high (1500–2000°C) temperatures in small samples can be readily achieved using commercial microwave ovens if appropriate MW transparent sample holders are used.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 124: Symposium M – Microwave Processing of Materials I , 1988 , 33
Copyright
Copyright © Materials Research Society 1988

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Jordan, E.L., Balmain, K.G., Electromagnetic Waves and Radiating Systems, 2nd edition, (Prentice-Hall, 1968).Google Scholar
2. Okress, E.C., Microwave Power Engineering, (Academic Press, 2 volumes).Google Scholar
3. Tinga, W.R., Mat. Res. Soc. Symp. Proc., 60, 105–116, (1985).Google Scholar
4. “Microwave Power in Industry”, Transactions (1), International Microwave Power Institute, (1973).Google Scholar
5. IEEE Trans. of the Microwave Theory and Technique group (1970–1985).Google Scholar
6. J. of Microwave Power, (International Microwave Power Institute, 301 Maple Avenue W, Tower Suite 520, Vienna, VA 22180), 1–20, (1969–1988).Google Scholar
7. Van Dommelen, D.M., Stefens, P.F., J. Microwave Power, 19, 121–126, (1987).Google Scholar
8. VanBeek, L.K.H., Prog. Dielectr., 7, 69, (1967).Google Scholar
9. Tinga, W.R., Voss, W.A.G., and Blossey, D.F., J. of Appl. Phys., 44 (9), 3897–3902, (Sept. 1973).Google Scholar
10. Westphal, W.B., MIT Technical Report, 182, (1963).Google Scholar
11. Westphal, W.B. and Sils, A., Airforce Materials Laboratory, Wright Patterson Airforce Base, Ohio, Tech. Rept. AFML-7R-72-39, (1972).Google Scholar
12. Frost, H.M., DOE DAFS/ADIP/SPM Semi-annual Progress Report on Fusion Reactor Materials, Los Alamos National Laboratory (LA-UR-86-4226), 1986.Google Scholar
13. Frost, H.M., Materials Science and Technology Review, (1986).Google Scholar
14. Bosisio, R.G., Dallaire, R., and Phromothansy, P., J. of Microwave Power, 12 (4), 309–317, (1977).Google Scholar
15. Araneta, J.C., Brodwin, M. and Kriegsmann, G.E., IEEE Trans., MTT–32 (10), 1328–1335, (1984).Google Scholar
16. Okada, F., Tashiro, S. and Suzuki, M., Microwave Sintering of Ferrites, Advances in Ceramics, 15, Fourth Int. Conference on Ferrites, Part 1, 201–205, (1986).Google Scholar
17. Wong, D.K., Microwave Dielectric Constants of Metal Oxides at High Temperatures, (M.Sc. Thesis, University of Alberta, Canada, 1975).Google Scholar
18. Johnson, D.L. and Brodwin, M.E., EPRI Research Project 2730-01, Interim Report, (March 1987).Google Scholar
19. Chiang, B. and Hoyte, A., Int. Microwave Power Institute Symposium Proceedings, 63–64, (1982).Google Scholar
20. Kimrey, H.D., White, T.L., Bigelow, T.S., Becher, P.F., J. Microwave Power, Symp. Summaries, 81–82, (1986).Google Scholar
21. Richerson, D.W., Modern Ceramic Engineering, Marcel Dekker Inc., (1982).Google Scholar
22. Kingery, W.D., Bowen, H.K., Uhlmann, D.R., Introduction to Ceramics, 2nd edition, 485, (John Wiley and Sons, 1976).Google Scholar
23. Dils, R.R., J. Appl. Phys. 54 (3), 1198–1201; Accufiber, Vancouver, WA.Google Scholar
24. Meek, T.T. and Blake, R.D., J. of Materials Science Letters, 5, 270–274, (1986).Google Scholar
25. Johnston, D.A., Traveling Wave and Resonant Microwave Heating Applicator Design, (Ph.D. Thesis, University of Alberta, 1972).Google Scholar
26. Metaxas, A.C., J. of Microwave Power 9 (2), 123–128, (1974).Google Scholar
27. VanKoughnett, A.L., Dunn, J.G., Woods, L.W., J. of Microwave Power 9 (3), 195–204, (1974).Google Scholar
28. Matz, B., Kearney, D.C., Krieger, B., J. Microwave Power, Symp. Summaries, 84–85, (1986).Google Scholar
29. Directory of Services of International Microwave Power Institute, 301 Maple Avenue W., Tower Suite 520, Vienna, VA, 22180, (1987).Google Scholar