Hostname: page-component-586b7cd67f-r5fsc Total loading time: 0 Render date: 2024-11-25T15:23:04.205Z Has data issue: false hasContentIssue false
  • English
  • Français

Heat Transfer Analysis of the Plasma Sintering Process

Published online by Cambridge University Press:  15 February 2011

E. Pfender  and
Y.C. Lee
E. Pfender
Affiliation:
Heat Transfer Division, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455
Y.C. Lee
Affiliation:
Heat Transfer Division, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455
Get access

Abstract

In the process of r.f. plasma sintering of Al2O3 at reduced pressure, a number of puzzling observations have been reported. They include higher heating rates and higher maximum temperature of a sample at increased propagation velocities of the sample through the plasma and a sudden temperature drop of approximately 700°C if the sample motion in the plasma is stopped. An analysis of the sintering process indicates that the change of che surface area and of the catalytic properties of the sample surface during sintering seem to be responsible for these observations. The change from an initially negatively charged co an essentially non-charged surface causes a drastic decrease of the heat transfer from the plasma to the sample. A simulation of the plasma sintering process based on a r.f. argon plasma provides a semi-quancicative explanation of all the observed phenomena.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 30: Symposium L – Plasma Processing and Synthesis of Materials I , 1983 , 141
Copyright
Copyright © Materials Research Society 1984

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. Bennett, C.E.G., McKinnon, N.A. and Williams, L.S., Nature, 217, 1287–1288 (1968).Google Scholar
2. Cordone, L.G. and Martinsen, W.E., J. Am. Ceram. Soc., 55, 380 (1972).Google Scholar
3. Johnson, D.L. and Rizzo, H.A., Am. Ceram. Soc. Bull., 59, 467–472 (1980).Google Scholar
4. Kim, J.S. and Johnson, D.L., Am. Ceram. Soc. Bull., 62, 620–622 (1983).Google Scholar
5. Johnson, D.L., Department of Material Science and Engineering, Northwestern University, private communication, 1983.Google Scholar
6. Eckert, E.R.G. and Pfender, E., Advances in Heat Transfer, Hartnett, J.P. and Irvine, Jr., eds. (Academic Press, New York, 1967), 4, 270–272.Google Scholar
7. Pfender, E., Pure & Appl. Chem., 48, 199–213 (1976).Google Scholar
8. Liu, B.Y.H., Whitby, K.T. and Yu, H.H.S, J. Colloid Interface Sci., 23, 367–378 (1967).Google Scholar
9. Godard, R. and Chang, J.S., J. Phys. D, 13, 2005–2012 (1980).Google Scholar
10. Rykalin, N.N. and Uglov, A.A., High Temp., 19, 404–411 (1981).Google Scholar
11. Brettell, J.M., Powder Metallurgy Internat., 13, 86–87 (1981).Google Scholar
12. Palmour III, H. and Johnson, D.L., “Sintering and Related Phenomena”, Kuczynski, G.C., Hooton, N.A.and Gibbon, C.F., eds. (Gordon and Breach Sci. Pub., New York, 1967), 779–791.Google Scholar
13. Palmour III, H., Huckabee, M.L. and Hare, T.M., 6th International Material Symposium (U.C. Berkeley 1976) 308–319.Google Scholar
14. Cunningham, M.E. and Peddicord, K.L., Int. Heat Mass Transfer, 24, 1081–1088 (1981).Google Scholar