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Diffusion-Controlled Processes in Microwave-Fired Oxide Ceramics

Published online by Cambridge University Press:  28 February 2011

Mark A. Janney  and
Hal D. Kimrey
Mark A. Janney
Affiliation:
Oak Ridge National Laboratory P.O. Box 2008 Oak Ridge, TN 37831
Hal D. Kimrey
Affiliation:
Oak Ridge National Laboratory P.O. Box 2008 Oak Ridge, TN 37831
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Abstract

Processing oxide-based ceramics using microwave heating leads to a number of unexpected results, which can only be interpreted in terms of enhanced diffusion. Enhanced sintering has been observed in alumina and zirconia. Accelerated grain growth in dense, hot-pressed alumina has been demonstrated. Increased diffusion coefficients have been observed for diffusion of oxygen in sapphire. As yet, a satisfactory theory to account for these phenomena has not been developed. This paper reviews the experimental work conducted at the Oak Ridge National Laboratory during the past four years on the processing of oxides in both 2.45 and 28 GHz microwave furnaces.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 189: Symposium L – Microwave Processing of Materials II , 1990 , 215
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

1. Janney, M.A. and Kimrey, H.D., “Microwave Sintering of Alumina at 28 GHz,” Ceramic Powder Science, II, pp 919–924, Messing, G.L., Fuller, E.R., and Hausner, H., eds., American Ceramic Society, Westerville, Ohio, 1988.Google Scholar
2. Janney, M.A. and Kimrey, H.D., “Microstructure Evolution in Microwave-Sintered Alumina,” in Advances In Sintering, Bleninger, J. and Handwerker, C., eds., American Ceramic Society, Westerville, Ohio, 1990.Google Scholar
3. Tian, Y.L., Johnson, D.L., and Brodwin, M.E., “Ultrafine Microstructure of A1203 Produced by Microwave Sintering,” Ceramic Powder Science, II, pp 925-32, Messing, G.L., Fuller, E.R., and Hausner, H., eds., American Ceramic Society, Westerville, Ohio, 1988.Google Scholar
4. Janney, M.A. and Kimrey, H.D., unpublished results.Google Scholar
5. Janney, M.A., Calhoun, C.L., and Kimrey, H.D., “Microwave Sintering of Solid Oxide Fuel Cell Materials, I: Zirconia - 8 mol % Yttria,” submitted to the Journal of the American Ceramic Society.Google Scholar
6. Kimrey, H. D., Janney, M. A., and Kiggans, J. O., “Microwave sintering of Zirconia-Toughened Alumina,” this proceedings.Google Scholar
7. Janney, M. A., Kimrey, H. D., Schmidt, M. A., and Kiggans, J. O., “Grain Growth in Microwave-Annealed Alumina,” submitted to the Journal of the American Ceramic Society.Google Scholar
8. Schmidt, M.A., Janney, M.A. and Mayotte, J.R., “SEM Image Analysis of Grain Growth in Microwave-Annealed Alumina,” Microstructural Science, Vol. 18, Proc. 22nd IMS Meeting, Charlotte NC, July, 1989. IMS and ASM International, in press.Google Scholar
9. Palladino, A.E. and Coble, R.L., “Effect of Grain Boundaries on Diffusion- Controlled Processes in Aluminum Oxide,” J. Am. Ceram. Soc., 46(3)133–36(1963).Google Scholar
10. Coble, R.L., “Initial Sintering of Alumina and Hematite,” J. Am. Ceram. Soc., 41(2)55–62(1958).Google Scholar
11. Bykov, Y. and Goldenberg, A., “The Possibilities of Material Processing by Intense Millimeter Wavelength Radiation,” this proceedings.Google Scholar
12. Jorgenson, P.J. and Westbrook, J.H., “Role of Solute Segregation at Grain Boundaries During Final-Stage Sintering of Alumina,” J. Am. Ceram. Soc. 47(7)332–38(1964).Google Scholar
13. Mocellin, A. and Kingery, W.D., “Microstructural Changes During Heat Treatment of Sintered A1203,” J. Am. Ceram. Soc.,56(6)309–14(1973).Google Scholar
14. Bennison, S.J. and Harmer, M.P., “Effect of MgO on the Kinetics of Grain Growth in A1203,” J. Am. Ceram. Soc., 66(5)C–90(1983).Google Scholar
15. Bennison, S.J. and Harmer, M.P., “Grain-Growth Kinetics for Alumina in the Absence of a Liquid Phase,” J. Am. Ceram. Soc., 68(1)C–22(1985).Google Scholar
16. Reed, D.J. and B. Wuensch, J., “Ion-Probe Measurement of Oxygen Self-Diffusion in Single-Crystal A1203,” J. Am. Ceram. Soc., 63(1-2)88–92(1980).Google Scholar
17. Reddy, K.P.R. and A. Cooper, R., “Oxygen Diffusion in Sapphire,” J. Am. Celam. Soc., 65(12)634–638(1982).Google Scholar
18. Chen, M.Y., “Effects of Additive Gases on Radio Frequency Plasma Sintering of Alumina,” MS. Thesis, Northwestern U., 1987.Google Scholar