Hostname: page-component-745bb68f8f-g4j75 Total loading time: 0 Render date: 2025-01-27T06:40:38.811Z Has data issue: false hasContentIssue false
  • English
  • Français

Transmission electron microscopy observation of second-phase particles in β–Si3N4 grains

Published online by Cambridge University Press:  31 January 2011

Naoto Hirosaki ,
Tomohiro Saito ,
Fumio Munakata ,
Yoshio Akimune  and
Yuichi Ikuhara
Naoto Hirosaki
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba 305-0044, Japan
Tomohiro Saito
Affiliation:
Japan Fine Ceramic Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8578, Japan
Fumio Munakata
Affiliation:
Nissan Research Center, Nissan Motor Co., Ltd., 1 Natsushima-cho, Yokosuka 237-8523, Japan
Yoshio Akimune
Affiliation:
Nissan Research Center, Nissan Motor Co., Ltd., 1 Natsushima-cho, Yokosuka 237-8523, Japan
Yuichi Ikuhara
Affiliation:
Department of Materials Science, Faculty of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Get access

Abstract

Silicon nitride was fabricated by adding Y2O3 and Nd2O3 as sintering additives, sintering for 8 h at 1900 °C, and heat treating for 4 h at 2200 °C to enhance grain growth. The microstructure was investigated by scanning electron microscopy, high-resolution electron microscopy, energy dispersive x-ray spectroscopy (EDS), and electron microdiffraction. This material had a duplex microstructure composed of many fine grains and a few coarse grains. In β–Si3N4 grains, second-phase particles with the composition of liquid phase, Y–Nd–Si–O or Y–Nd–Si–O–N, in the size of 10–30 nm were observed. EDS spectra and microdiffraction patterns revealed that those were amorphous or crystalline particles of Y–Nd–apatite, (Y,Nd)10Si6O24N2. These particles were presumably formed during cooling by the precipitation of Y–Nd–Si–O–N, which was trapped in the β–Si3N4 grains as solid solution or trapped liquid. The results suggest that attention should be paid to the trace amounts of trapped elements in β–Si3N4 grains in trying to improve the thermal conductivity of sintered silicon nitride.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 7 , July 1999 , pp. 2959 - 2965
Copyright
Copyright © Materials Research Society 1999

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.Deeley, G.G., Herbert, J.M., and Moore, N.C., Powder Metall. 4, 145 (1961).CrossRefGoogle Scholar
2.Tsuge, A., Kudo, H., and Komeya, K., J. Am. Ceram. Soc. 57, 169 (1974).CrossRefGoogle Scholar
3.Quackenbush, C.L., Smith, J.T., Neil, J.T., and French, K.W., in Progress in Nitrogen Ceramics, edited by Riley, F.L. (Martinus Nijhoff, Boston, MA, 1983), p. 669.CrossRefGoogle Scholar
4.Hirosaki, N., Okada, A., and Matoba, K., J. Am. Ceram. Soc. 71 C144 (1988).CrossRefGoogle Scholar
5.Kingery, W.D., J. Appl. Phys. 30, 301 (1959).CrossRefGoogle Scholar
6.Clarke, D.R., in Progress in Nitrogen Ceramics, edited by Riley, F.L. (Martinus Nijhoff, Boston, MA, 1983), p. 341.CrossRefGoogle Scholar
7.Oyama, Y. and Kamigaito, O., Jpn. J. Appl. Phys. 10, 1637 (1971).CrossRefGoogle Scholar
8.Jack, K.H. and Wilson, W.I., Nature, Phys. Sci. 238, 28 (1972).Google Scholar
9.Hirosaki, N., Okamoto, Y., Ando, M., Munakata, F., and Akimune, Y., J. Ceram. Soc. Jpn. 104, 49 (1996).CrossRefGoogle Scholar
10.Hirosaki, N., Okamoto, Y., Ando, M., Munakata, F., and Akimune, Y., J. Am. Ceram. Soc. 79, 2878 (1996).CrossRefGoogle Scholar
11.Kossowsky, R., Miller, D.G., and Diaz, E.S., J. Mater. Sci. 10, 983 (1975).CrossRefGoogle Scholar
12.Hirosaki, N., Okamoto, Y., Ando, M., Munakata, F., and Akimune, Y., in 6th International Symposium on Ceramic and Components for Engines, edited by Niihara, K., Hirano, S., Kanzaki, S., Komeya, K., and Morinaga, K. (Japan Fine Ceramic Association, Tokyo, Japan, 1997), p. 898.Google Scholar
13.Kuriyama, M., Inomata, Y., Kijima, T., and Hasegawa, Y., Am. Ceram. Soc. Bull. 57, 1119 (1978).Google Scholar
14.Watari, K., Seki, Y., and Ishizaki, K., J. Ceram. Soc. Jpn. 97, 56 (1989).CrossRefGoogle Scholar
15.Munakata, F., Sato, C., Hirosaki, N., Tanimura, M., Akimune, Y., and Inoue, Y., J. Ceram. Soc. Jpn. 106, 441 (1998).CrossRefGoogle Scholar
16.Hirosaki, N., Akimune, Y., and Mitomo, M., J. Am. Ceram. Soc. 76, 1892 (1993).CrossRefGoogle Scholar
17.Hirosaki, N., Akimune, Y., and Mitomo, M., J. Ceram. Soc. Jpn. 101, 1239 (1993).CrossRefGoogle Scholar
18.Jack, K., J. Mater. Sci. 11, 1135 (1976).CrossRefGoogle Scholar
19.Slasor, S., Liddell, K., and Thompson, D.P., Special Ceramics 8, 51 (1986).Google Scholar
20.Wang, C.M., Pan, X., Gu, H., Duscher, G., Hoffmann, M.J., Cannon, R.M., and Ruhle, M., J. Am. Ceram. Soc. 80, 1397 (1997).CrossRefGoogle Scholar
21.Mitomo, M., Hirosaki, N., and Mitsuhashi, T., J. Mater. Sci. Lett. 3, 915 (1984).CrossRefGoogle Scholar