Hostname: page-component-78c5997874-lj6df Total loading time: 0 Render date: 2024-11-18T01:25:25.037Z Has data issue: false hasContentIssue false
  • English
  • Français

Sintering characteristics of nanocrystalline TiO2

Published online by Cambridge University Press:  31 January 2011

H. Hahn ,
J. Logas  and
R. S. Averback
H. Hahn
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
J. Logas
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
R. S. Averback
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
Get access

Abstract

The microstructural development of compacted nanocrystalline TiO2 powder was studied as a function of sintering temperature up to 1000°C. Grain growth was monitored using x-ray diffraction and scanning electron microscopy. The specific surface area and total porosity were determined quantitatively using the nitrogen adsorption BET. The density was measured by gravimetry using Archimedes principle. The green body density of compacted n-TiO2 with average grain size of 14 nm is as high as 75% of theoretical bulk density. Low temperature surface diffusion leads to the disappearance of small pores, while noticeable densification commences at 600°C and reaches near theoretical values at 900°C. Grain growth also begins at 600°C, accelerating rapidly by 1000°C. Hot isostatic pressing is observed to enhance densification while suppressing grain growth.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 3 , March 1990 , pp. 609 - 614
Copyright
Copyright © Materials Research Society 1990

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

1Barringer, E. A. and Bowen, H. K., Appl. Phys. A 45, 271 (1988).CrossRefGoogle Scholar
2Zhao, J. and Harmer, M. P., J. Am. Ceram. Soc. 71, 113 (1988).CrossRefGoogle Scholar
3Roosen, A.and Bowen, H. K., J. Am. Ceram. Soc. 71, 970 (1988).CrossRefGoogle Scholar
4Brook, R. J., Proc. Brit. Ceram. Soc. 32, 7 (1982).Google Scholar
5Herring, C., J. Appl. Phys. 21, 437 (1950).CrossRefGoogle Scholar
6Coble, R. L., J. Appl. Phys. 34, 1679 (1963).CrossRefGoogle Scholar
7Mackenzie, J. D., in Ultrastructure Processing of Ceramics, Glasses and Composites, edited by Hench, L. L. and Ulrich, D. R. (Wiley, New York, 1984), p. 15.Google Scholar
8Barringer, E. A. and Bowen, H. K., Langmuir 1, 414 (1985).CrossRefGoogle Scholar
9Birringer, R., Herr, U., and Gleiter, H., Trans. Jpn. Inst. Met. 27 (suppl.), 43 (1986).Google Scholar
10Siegel, R. W., Hahn, H., Ramasamy, S., Zongquan, L., Ting, L., and Gronsky, R., J. de Phys. C5, suppl. 10, 681 (1988); R.W. Siegel, S. Ramasamy, H. Hahn, Li Zongquan, Lu Ting, and R. Gronsky, J. Mater. Res. 3 (6), 1367 (1988).Google Scholar
11Karch, H., Birringer, R., and Gleiter, H., Nature 330, 556 (1987).CrossRefGoogle Scholar
12Gregg, S. J. and Sing, K. S. W., Adsorption, Surface Area and Porosity (Academic Press, 1982).Google Scholar
13Gleiter, H., in Deformation of Polycrystals: Mechanisms and Microstructure, Proc. of 2nd Risø Int. Symp. (1981), p. 15.Google Scholar
14Hahn, H., Eastman, J. A., and Siegel, R. W., Ceramic Transactions B 1, 1115 (1988), American Ceramic Society, Westervilie, OH.Google Scholar
15Höfler, H. J., Hahn, H., and R. S. Averback (to be published).Google Scholar
16McGeary, R. K., J. Am. Ceram. Soc. 44, 513 (1961).CrossRefGoogle Scholar
17Bordia, R. K. and Raj, R., J. Am. Ceram. Soc. 71, 302 (1988).CrossRefGoogle Scholar
18Coble, R. L. and Gupta, T. K., in Sintering and Related Phenomena, edited by Kuczynski, G. C., Hooton, N. A., and Gibbon, C. F. (Gordon and Breach, New York, 1967), pp. 423–443.Google Scholar
19Hahn, H. and Averback, R. S., J. Appl. Phys., Jan. 1990.Google Scholar