Hostname: page-component-848d4c4894-nmvwc Total loading time: 0 Render date: 2024-06-26T12:05:55.622Z Has data issue: false hasContentIssue false
  • English
  • Français

Mechanical properties of hot isostatically pressed Si3N4 and Si3N4/SiC composites

Published online by Cambridge University Press:  31 January 2011

O. Unal ,
J.J. Petrovic  and
T.E. Mitchell
O. Unal
Affiliation:
Center for Materials Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
J.J. Petrovic
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
T.E. Mitchell
Affiliation:
Center for Materials Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Get access

Abstract

The mechanical properties of hot isostatically pressed monolithic Si3N4 and Si3N4−20 vol. % SiC composites have been studied by microindentation at temperatures up to 1400 °C. Indentation crack patterns and microstructures have been examined by optical microscopy, scanning electron microscopy, and transmission electron microscopy. It is shown that dense Si3N4 base materials can be synthesized by HIPing without densification aids. Both the monolithic Si3N4 and the Si3N4/SiC composites exhibit high hardness values which gradually decrease with increasing temperature. Both types of material show low fracture toughness values apparently because of strong interfacial bonding. On the other hand, the fracture toughness of the composite is about 40% higher than that of the monolithic material, due to the presence of the 20 vol. % SiC whiskers. A crack deflection/debonding mechanism is likely to be responsible for the higher toughness observed in the composite. High resolution electron microscopy shows that the grain boundaries in both samples contain a thin SiO2 layer.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 3 , March 1993 , pp. 626 - 634
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

1Ziegler, G.Heinrich, J. and Wotting, G.J. Mater. Sci. 22, 3041 (1987).CrossRefGoogle Scholar
2Yamada, T.Shimada, M. and Koizumi, M.Ceram. Bull. 60, 11 (1981).Google Scholar
3Terwilliger, G. R. and Lange, F.F.J. Am. Ceram. Soc. 57, 25 (1974).Google Scholar
4Prochazka, S. and Rocco, W.A.High Temp. High Press. 10, 87 (1978).Google Scholar
5Shimada, M.Koizumi, M.Tanaka, A. and Yamaha, T.J. Am. Ceram. Soc. 65, C48 (1982).CrossRefGoogle Scholar
6Tsukuma, K.Shimada, M. and Koizumi, M.Ceram. Bull. 60, 910 (1981).Google Scholar
7Terao, K.Miyamoto, Y. and Koizumi, M.J. Am. Ceram. Soc. 71, C167 (1988).CrossRefGoogle Scholar
8Adlerborn, J.Burstrom, M.Hermansson, L. and Larker, H. T.Mater. Design 8, 229 (1987).CrossRefGoogle Scholar
9Rice, R.W.Ceram. Eng. Sci. Proc. 2, 661 (1981).Google Scholar
10Milewski, J.V.Gac, F.D. and Petrovic, J.J.J. Mater. Sci. 20, 1167 (1985).CrossRefGoogle Scholar
11Unal, O., Ph.D. Thesis Case Western Reserve University (1991).Google Scholar
12Anstis, G.R.Chantikul, P.Lawn, B.R. and Marshall, D.B.J. Am. Ceram. Soc. 64, 533 (1981).CrossRefGoogle Scholar
13Tanaka, I.Pezzotti, G.Okamoto, T.Miyamoto, Y. and Koizumi, M., J. Am. Ceram. Soc. 72, 1656 (1989).CrossRefGoogle Scholar
14Shalek, P.Petrovic, J.J.Hurley, G.F. and Gac, F.D.Am. Ceram. Soc. Bull. 65, 351 (1986).Google Scholar
15Lange, F.F.J. Am. Ceram. Soc. 62, 428 (1979).Google Scholar
16Watari, K.Kawamoto, M. and Ishizaki, K.Mater. Sci. Eng. A109, 89 (1989).Google Scholar
17Miyamoto, Y.Tanaka, K.Shimada, M. and Koizumi, M. in Ceramic Materials and Components for Engines, Deutsche Keramische Gesellschaft, 271 (1986).Google Scholar
18Faber, K.T. and Evans, A.G.J. Am. Ceram. Soc. 66, C94 (1983).CrossRefGoogle Scholar
19Pezzotti, G.Tanaka, I. and Okamoto, T.J. Am. Ceram. Soc. 73, 3039 (1990).Google Scholar
20Evans, A. G.Lee, M. Y. and Hutchison, J. W.J. Am. Ceram. Soc. 72, 2300 (1989).CrossRefGoogle Scholar
21Campbell, G.H.Riihle, M.Dalgleish, B.J. and Evans, A.G.J. Am. Ceram. Soc. 73, 521 (1990).CrossRefGoogle Scholar
22Unal, O.Petrovic, J. J. and Mitchell, T. E.J. Mater. Res. 7, 136 (1992).Google Scholar
23Renlund, G. M.Prochazka, S. and Doremus, R. H.J. Mater. Res. 6, 2723 (1991).Google Scholar