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Microwave Sintering of Pure and Doped Nanocrystalline Alumina Compacts

Published online by Cambridge University Press:  10 February 2011

R. W. Bruce ,
A. W. Fliflet ,
L. K. Kurihara ,
G.-M. Chow  and
P. E. Schoen
R. W. Bruce
Affiliation:
Plasma Physics Division, D. Lewis, III, R. J. Rayne and B. A. Bender, Material Science and Technology Division
A. W. Fliflet
Affiliation:
Plasma Physics Division, D. Lewis, III, R. J. Rayne and B. A. Bender, Material Science and Technology Division
L. K. Kurihara
Affiliation:
Center for Biomolecular Science and Engineering, Naval Research Laboratory, Washington, DC, 20375 – 5346
G.-M. Chow
Affiliation:
Center for Biomolecular Science and Engineering, Naval Research Laboratory, Washington, DC, 20375 – 5346
P. E. Schoen
Affiliation:
Center for Biomolecular Science and Engineering, Naval Research Laboratory, Washington, DC, 20375 – 5346
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Abstract

A single-mode cavity microwave furnace, operating in the TE103 mode at 2.45 GHz is being used to investigate sintering of pure and doped nanocrystalline alumina. The purpose of these experiments is to determine the effect of additives on the sintering process in the nanocrystalline regime. Using the sol-gel method, high purity Al2O3 nanocrystalline powders were synthesized. These powders were calcined at 700°C and then CIP'ed to 414 MPa, producing 0.4 in. diameter, 0.25 in. high cylindrical compacts. The compacts were heated in the microwave furnace to temperatures between 1100°C to approximately 1800°C and were then brought back to room temperature using a triangular heating profile of about 30 minutes duration. A two-color IR pyrometer was used to monitor the surface temperature of the workpiece. The additives tested in this work lowered the temperature needed for densification but this effect was offset by increased grain growth. Initial grain growth from < 5 nm to ∼ 50 nm was closely correlated with the γ to α-alumina phase transition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 430: Symposium O – Microwave Processing of Materials V , 1996 , 139
Copyright
Copyright © Materials Research Society 1996

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References

1. Bruce, R. W., Fliflet, A. W., Kurihara, L. K., Lewis, D. III, Rayne, R., Chow, G.-M., Schoen, P. E., Bender, B. A. and Kinkead, A. K. in Microwaves: Theory and Applications in Materials Processing III, edited by Clark, D. E., Folz, D. C., Oda, S. J., and Silberglitt, R. (Amer. Cer. Soc.. Trans. 59, Westerville, OH, 1995) pp. 407–414.Google Scholar
2. Fliflet, A. W., Bruce, R. W., Lewis, D., III, Rayne, R., Bender, B., Kurihara, L. K., Chow, G.-M., Schoen, P. E. and Kinkead, A. K., “Design and Initial Operation of a 6 kW 2.45 GHz Single- Mode Microwave Cavity Furnace,” NRL Memorandum Report NRL/MR/6793--95-7745, 1995.Google Scholar
3. Sutton, W. H., MRS Bulletin 23 (11), (1993).Google Scholar
4. Aliquat, M., Mazo, L. and Desgardin, G. 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, Pittsburgh, PA, 1991) pp. 229–235.Google Scholar
5. Eastman, J. A., Sickafus, K. E., Katz, J. D., Boeke, S. G., Blake, R. D., Evans, C. R., Schwarz, R. B. and Liao, Y. X. 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, Pittsburgh, PA, 1991) pp. 273–278.Google Scholar
6. Vollath, D., Varma, R. and Sickafus, K. E. in Microwave Processing of Materials III, edited by Beatty, R. L., Sutton, W. H. and Iskander, M. F. (Mater. Res. Soc. Proc. 269, Pittsburgh, PA, 1992) pp. 379–384.Google Scholar
7. Freim, J., McKittrick, J., Katz, J. and Sickafus, K. in Microwave Processing of Materials IV, edited by Iskander, M. F., Lauf, R. J. and Sutton, W. H. (Mater. Res. Soc. Proc. 347, Pittsburgh, PA, 1994) pp. 525–530.Google Scholar
8. Kurihara, L. K., Chow, G.-M. and Schoen, P. E., “Low Temperature Processing of Nanoscale Ceramic Nitride Particles Using Molecular Precursors,” Patent Disclosure, US Navy Case 82,737 (1995), application pending.Google Scholar
9. Bruce, R. W., Fliflet, A. W. and Kinkead, A. K., presented at the 1996 MRS Spring Meeting, San Francisco, CA, 1996 (unpublished).Google Scholar
10. Coble, R. L., J. Amer. Cer. Soc. 45, 123 (1962)Google Scholar