Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2025-01-04T23:57:33.279Z Has data issue: false hasContentIssue false
  • English
  • Français

Preparation of alumina ceramics from aqueous suspensions employing the hydrolysis of aluminum nitride

Published online by Cambridge University Press:  31 January 2011

S. Novak  and
T. Kosmac
S. Novak
Affiliation:
Ceramics Department, Jozef Stefan Institute, Ljubljana, Slovenia
T. Kosmac
Affiliation:
Ceramics Department, Jozef Stefan Institute, Ljubljana, Slovenia
Get access

Abstract

This paper summarizes the effects of selected processing parameters on the behavior of aqueous alumina suspensions during hydrolysis-assisted solidification and on the properties of the green and sintered parts prepared by this technique. Measurements of the changes in viscosity, the pH, and the impedance of aqueous suspensions with time were performed to evaluate the process. Using impedance spectroscopy, the effects of the addition of AlN, the solids content in the ceramic suspension, and the effect of the solidification temperature on the progress of solidification were followed. It was demonstrated that the solidification temperature significantly affects not only the solidification rate but also the properties of the green and sintered parts. A transmission electron microscopy analysis of dry green parts revealed that the host ceramic particles are bound by a predominantly amorphous AlOOH phase, which results in a high strength for the green parts.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 2 , February 2002 , pp. 445 - 450
Copyright
Copyright © Materials Research Society 2002

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.Rak, Z.S., CFI, Ceram. Forum Int. 77(6), 6 (2000).Google Scholar
2.Kosmac, T., Novak, S., and Sajko, M., J. Eur. Ceram. Soc. 17, 427 (1997).CrossRefGoogle Scholar
3.Novak, S., Kosmac, T., Krnel, K., and Drazic, G., J. Eur. Cer. Soc. 22, 289 (2002).Google Scholar
4.Krnel, K. and Kosmac, T., J. Am. Ceram. Soc. 83, 1375 (2000).CrossRefGoogle Scholar
5.Novak, S. and Kosmac, T., Large alumina parts from aqueous suspensions, in Euromat’99 Proceeding. Vol. 8: Ceramics-Reliability, Tribology and Wear (2000), p. 150.Google Scholar
6.Kosmac, T. and Krnel, K., Microstructure and mechanical properties of HAS formed Al2O3 Y-TZP and Si3N4 ceramics, in Proceedings of the 6th International Symposium on Ceramic Materials and Components for Engines, Arita, Japan, edited by Niihara, K. (Tokyo, Japan, 1998), p. 663.Google Scholar
7.Novak, S. and Kosmac, T., SiC-based ceramics prepared by HAS (in preparation).Google Scholar
8.Bowen, P., Highfield, J., Mocellin, A., and Ring, T.A., J. Am. Ceram. Soc. 73(3), 724 (1990).Google Scholar
9.Mobley, W.M., Colloidal properties, processing and characterization of aluminum nitride suspensions, Thesis, Alfred University, Alfred, NY (1996).Google Scholar
10.Gorter, H., Garretsen, J., and Terpstra, R.A., Comparison of the Reactivity of Some Surface Treated AlN Powders With Water, in Proceedings of the 3rd Euro-ceramics, edited by Duran, P. and Fernandez, J.F. (Gruppo Editoriale Faenza Editrice S.p.a., Faenza, Spain, 1993), Vol. 1.Google Scholar
11.Seitz, K., Hessel, F., Güther, H.M., Roosen, A., and Aldinger, F., Comparison of the surface Characteristics of Alumina and Aluminum Nitride Powders, in Cer. Powd. Sci. IV, Ceram. Trans. 22, edited by Hirano, S., Messing, G.L., and Hausner, H. (Am. Ceram. Soc., Westerville, OH, 1991), Vol. 227.Google Scholar
12.Novak, S. and Kosmac, T., Mater. Sci. Eng. A256, 237 (1998).CrossRefGoogle Scholar
13.Novak, S., Drazic, G., and Macek, S., J. Eur. Cer. Soc. 21(10–11), 2081 (2001).Google Scholar
14.Novak, S. and Drazic, G., J. Am. Ceram. Soc. (2001, in press).Google Scholar
15.Fukumoto, S., Hookabe, T., and Tsubakino, H., J. Mater. Sci. 35, 2743 (2000).CrossRefGoogle Scholar
16.Brinker, C.J. and Scherrer, G.W., Sol-gel science: The physics and chemistry of sol-gel processing (Academic Press Inc., Boston, MA, 1990), p. 362.Google Scholar
17.Bradley, S.M., Kydd, R.A., and Howe, R.F., J. Colloids Interface Sci. 159, 405–412 (1993).Google Scholar
18.Morgado, E., Lam, Y.L., and Nazar, L.F., J. Colloid Interface Sci. 188, 257–269 (1997).Google Scholar
19.Gauckler, L.J., Th. Graule, and F. Baader, Mater. Chem. Phys. 61, 78 (1999).CrossRefGoogle Scholar
20.Legros, C., Carry, C., and Bowen, P., J. Eur. Ceram. Soc. 19, 1967 (1999).Google Scholar
21.Kosmac, T., Novak, S., and Krnel, K., Z. Metkd. 92, 150 (2001).Google Scholar