Hostname: page-component-5c6d5d7d68-7tdvq Total loading time: 0 Render date: 2024-08-18T22:51:29.105Z Has data issue: false hasContentIssue false
  • English
  • Français

Partial Devitrification of Sintered Silicon Nitride During Static Fatigue Testing

Published online by Cambridge University Press:  25 February 2011

W. Braue  and
G. D. Quinn
W. Braue
Affiliation:
German Aerospace Research Establishment (DLR), D-5000 Cologne 90, Germany
G. D. Quinn
Affiliation:
National Institute of Standards and Technology (NIST), Ceramics Division, Gaithersburg, MD 20899, USA
Get access

Abstract

The static fatigue behavior of sintered Y2O3/A12O3-fluxed Si3N4 in air is controlled by slow crack growth or creep fracture. Partial devitrification of the amorphous grain boundary phase at 1000°C and 1100°C improves the static fatigue resistance with specimens surviving up to 1500 hrs. during stress rupture experiments. In this study the early stages of partial devitrification during static fatigue testing at 1000°C are investigated by conventional and analytical transmission electron microscopy with emphasis on nucleation and growth of δ-Y2Si2O7 and X1-Y2SiO5 and possible constraints from different stress states. The results show that the stress state does not affect the nature of the secondary phase assemblage. However, the amount of crystallization is higher within the tensile region of the flexural specimens than in areas which experienced compressive stresses.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 287: Symposium K – Silicon Nitride Ceramics–Scientific and Technological Advances , 1992 , 347
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] Leng-Ward, G. and Lewis, M. H., in: Glasses and Glass-Ceramics, edited by Lewis, M. H. (Chapman & Hall, New York 1989), p. 106 Google Scholar
[2] Dinger, T. R., Rai, R. S. and Thomas, G., J. Am. Ceram. Soc. 71, 236 (1988)Google Scholar
[3] Lee, W. E., Drummond, C. H., Hilmas, G. E., Kumar, S., J. Am. Ceram. Soc. 73, 3575 (1990)Google Scholar
[4] Kumar, S. and Drummond, C. H., J. Mater. Res. 7, 997 (1992)Google Scholar
[5] Quinn, G. D. and Braue, W., J. Mat. Sci. 25, 4377 (1990)Google Scholar
[6] Quinn, G. D., J. Mat. Sci. 25, 4361 (1990)Google Scholar
[7] Raj, R. and Lange, F. F., Acta metall. 29, 1993 (1981)Google Scholar
[8] Marion, J. E., Evans, A. G., Drory, M. D. and Clarke, D. R., Acta metall. 31, 1445 (1983)Google Scholar
[9] Wiederhorn, S. M., Hockey, B. J., Krause, R. F. and Jakus, K., J. Mat. Sci. 21, 810 (1986)Google Scholar
[10] Dryden, J. R., Kucerovsky, D., Wilkinson, D. S. and Watt, D. F., Acta metall. 37,2007 (1989)Google Scholar
[11] Liddell, K. and Thompson, D. P., Br. Ceram. Trans. J. 85, 17 (1986)Google Scholar
[12] Clarke, D. R., Journal de Physique, C4, 51 (1985)Google Scholar