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Influence of the Interfacial Properties on the Microstructural Development and Properties of Silicon Nitride Ceramics

Published online by Cambridge University Press:  10 February 2011

M. J. Hoffmann ,
H. Gu  and
R. M. Cannon
M. J. Hoffmann
Affiliation:
Institute for Ceramics in Mech. Eng., University of Karlsruhe, D-76131 Karlsruhe, Germany
H. Gu
Affiliation:
Japan Science and Technology Cooperation, Superplasticity Poject, Nagoya 456, Japan
R. M. Cannon
Affiliation:
Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720.
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Abstract

The influence of the sintering additive system on the grain growth anisotropy of silicon nitride has been studied in the two supersaturated oxynitride glass systems M-Si-Al-O-N (where M = Yb, Gd, Nd, La, and Y) and M-Si-Mg-O-N (where M = Lu, Sm, La, Sc and Y). The glasses contained a low volume fraction of grains and offer the possibility to study grain growth without impingement. Both systems show an increase of the aspect ratio with an increasing cation radius of the rare earth elements. The aspect ratios for the Sc- and Y-based glasses are higher than expected from the ionic radius.

Analytical transmission electron microscopy of the bulk glass and grain boundary film between flocculated particles reveals a difference in chemical composition. The larger rare earth cations are enriched in the film and the smaller ones are depleted compared to the bulk composition. The enrichment of the larger cations can be considered as an adsorption layer which reduces the growth rate of the prism planes. Glass systems with smaller cations (Yb, Gd) reveal a pronounced growth of the prism planes and sialon is formed in the outer region of the grains. The interfacial strength which determines the fracture toughness increases with a decreasing cation radius, but the effect is mainly attributed to the sialon formation rather than by the cation itself.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 586: Symposium M – Interfacial Engineering for Optimized Properties II , 1999 , 65
Copyright
Copyright © Materials Research Society 2000

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References

REFERENCES

[1] Chen, I-Wei et al. (eds.), Silicon Nitride Ceramics - Scientific and Technological Advances, MRS Proceedings Vol.287, Materials Research Society, Pittsburgh (PA), 1993.Google Scholar
[2] Hoffmann, M.J. and Petzow, G. (eds.), Tailoring of Mechanical Properties of Si3N4 Ceramics, Kluwer Academic Publishers, Dordrecht, Netherlands, 1994.Google Scholar
[3] Hoffmann, M.J., Pure & Appl. Chem., Vol.67, No. 6, (1995), 939.10.1351/pac199567060939Google Scholar
[4] Mitomo, M., in: Proceedings of an International Symposium on the Science of Engineering Ceramics, edited by Kimura, S. and Nijhara, K., Ceramic Society of Japan, Tokyo, Japan, 1991, pp. 101.Google Scholar
[5] Mitomo, M. et al., MRS Bull., 20 [2] (1995) 38.10.1557/S0883769400049204Google Scholar
[6] Emoto, H. and Mitomo, M., J. Euro. Ceram. Soc., 17 [4], (1997), 797.Google Scholar
[7] Hoffmann, M.J., in: Tailoring of Mechanical Properties of Si3N4 Ceramics, edited by Hoffinann, M.J. and Petzow, G., Kluwer Academic Publishers, Dordrecht, Netherlands (1994), 59.Google Scholar
[8] Hirao, K. et al., J. Am. Ceram. Soc., 77 [7], (1994), 1857.10.1111/j.1151-2916.1994.tb07062.xGoogle Scholar
[9] Kitayama, M. et al., J. Ceram. Soc. Japan, 107 [11] (1999) 995.Google Scholar
[10] Kanamaru, M., Investigation of Grain Growth in Si3N4 Ceramics Containing Rare Earth Oxides (in Ger.), Dissertation. University of Stuttgart and Max-Planck-Institute for Metals Research, Stuttgart, Germany, 1994.Google Scholar
[11] Becher, P.F., Hwang, S.L., and Hsueh, C.H., MRS Bull., 20 [2] (1995) 23.10.1557/S0883769400049174Google Scholar
[12] Krmrner, M. et al., J. Am. Ceram. Soc., 76 [11], (1993), 2778.Google Scholar
[13] Wang, C.-M. et al., J. Am. Ceram. Soc., 80 [6], (1997), 1397.Google Scholar
[14] Wang, C.-M. et al., J. Am. Ceram. Soc., 79 [3], (1996), 788.10.1111/j.1151-2916.1996.tb07946.xGoogle Scholar
[15] Kitayama, M. et al., Acta Mater., 46, (1998), 6541.Google Scholar
[16] Holzer, S., Influence of the rare earth oxides on the grain growth behavior of silicon nitride in oxynitride glasses (in Ger.), Diploma thesis, Institute for Ceramics in Mechanical Engineering, University of Karlsruhe, (2000).Google Scholar
[17] Becher, P.F., J. Am. Ceram. Soc., 81 [11], (1998), 2821.10.1111/j.1151-2916.1998.tb02702.xGoogle Scholar
[18] Becher, P.F., in: Silicon Nitride Ceramics - Scientific and Technological Advances, edited by Chen, I-Wei et. al., MRS Proceedings Vol.287, Materials Research Society, Pittsburgh (PA), (1993), 147.Google Scholar
[19] Sajgalik, P. et al., J. Aim. Cerarm. Soc., 78 [10], (1995), 2619.Google Scholar
[20] Tajima, Y., in: Silicon Nitride Ceramics - Scientific and Technological Advances, edited by Chen, I-Wei et. al., MRS Proceedings Vol.287, Materials Research Society, Pittsburgh (PA), (1993), 189.Google Scholar
[21] Sun, E. et al., J. Am. Ceram. Soc., 81 [11], (1998), 2831.Google Scholar
[22] Sun, E. et al., Acta mater., Vol.47, No. 9, (1999), 2777.Google Scholar