Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-03T08:59:08.854Z Has data issue: false hasContentIssue false
  • English
  • Français

Sintering of Coated Powders. I. Silica-Ytfria System

Published online by Cambridge University Press:  25 February 2011

Herbert Giesche
Herbert Giesche*
Affiliation:
Max-Planck-Institut for Metallforschung, Institut fir Werkstoffwissenschaft / PML, Heisenbergstr. 5, 7000 Stuttgart 80, FRG
Get access

Abstract

Silica particles were produced by the well known “Stbber” process. The silica core size as well as the coating thickness could be varied by the reaction conditions. Respectively, yttria core particles or coatings on silica nuclei were synthesized by the ureadecomposition method, previously described in general by Matijevic or Akinc et al.

The (silica or yttria) core size (86 to 400 nm) as well as the coating thickness (monolayer to 100 nm) was varied systematically. Green compacts of about 50 to over 60 % thD. were produced either by sedimentation, centrifugation, or pressure filtration of well dispersed slurries.

The results demonstrated the enhanced densification of coated powders. A two step shrinkage process was observed for some of the samples. TEM micrographs and X-ray analysis exemplify the microstucture and phase development during sintering.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 286: Symposium J – Nanophase and Nanocomposite Materials , 1992 , 251
Copyright
Copyright © Materials Research Society 1993

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. Johnson, D. W. Jr.; Am. Ceram. Soc. Bull.; 60 [2], 221–43 (1981)Google Scholar
2. Sugimoto, T.; MRS Bulletin; 23–8 (1989)Google Scholar
3. Matijevic, E.; pp. 441–58 in ‘High Tech Ceramics’, ed. Vincenzini, P; Elsevier Science Publisher, Amsterdam (1987)Google Scholar
4. Ambrosius, K., Knapp, A., Plamper, H. and Esselborn, R. (Merck Patent Gesellschaft), U.S. Patent 4867794, Sep.19,1989.Google Scholar
5. Glausch, R., Brückner, D. and Maisch, R., Farbe + Lacke 96 [6], 412–5 (1990)Google Scholar
6. Nishihara, A. and Tsunashima, M. (Mitsubishi Kinzoku Kabushiki Kaisha, Tokyo, Japan), United States Patent 5,017,231, (1991)Google Scholar
7. Riedel, R., Kunesch, J., Passing, G., Kaysser, W. and Petzow, G.; in ‘Proc. of “International Conference on Advanced Metal & Ceramic Matrix Composites”, Anaheim, CA 1990Google Scholar
8. Kapolnek, D. and Jonghe, L. C. de; J. Europ. Ceram. Soc.; 7, 345–51 (1991)Google Scholar
9. Sacks, M. D., Bozkurt, N. and Scheiffele, G. W.; J. Am. Ceram. Soc.; 74 [10], 2428–37 (1991)Google Scholar
10. Stober, W., Fink, A. and Bohn, E.; J. Colloid Interface Sci.; 26 [1], 62–69 (1968)Google Scholar
11. Unger, K. K., Giesche, H. and Kinkel, J. N.; Merck, E.; (DE), 3534143 Al (25.09.1985) (DE), 3616133 Al (14.05.1986)Google Scholar
12. Giesche, H.; PhD Thesis, University of Mainz, Germany (1987)Google Scholar
13. Aiken, B., Hsu, W. P.and Matijevic, E.; J. Mater. Sci.; 25, 1886–94 (1990)Google Scholar
14. Sordelet, D. and Akinc, M.; J. Colloid Interface Sci.; 122 [1], 47–59 (1988)Google Scholar
15. Sordelet, D. J.and Akinc, M.; J. Am. Ceram. Soc.; 71 [12], 1148–53 (1988)Google Scholar