Superplasticity and Sinter-Forging of Fine-Grained Si3N4-Si2N2O Composite

Abstract:

Article Preview

The Si3N4- Si2N2O composites are fabricated with amorphous nano-sized silicon nitride powders by the liquid phase sintering(LPS) method in this article. XRD analysis shows that the sintered body consists of β-Si3N4 and Si2N2O. SEM experiment conforms that the average grain size of sintered body is less than 300nm. The superplastic deep-drawing forming can be proceed at a low temperature of 1550°C with a forming velocity of 0.2mm/min. There are only a few small sintered defects before forming, but there are a lot of cavity groups after forming. Cavitation failure occurs by nucleation, growth and interlinkage of cavities. The complex-shape gears can be formed by a sinter-forging technology when the sintering temperature is 1600°C and the superplastic forging temperature is 1550°C.

Info:

Periodical:

Materials Science Forum (Volumes 475-479)

Main Theme:

Edited by:

Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie

Pages:

2987-2990

Citation:

J. T. Luo et al., "Superplasticity and Sinter-Forging of Fine-Grained Si3N4-Si2N2O Composite", Materials Science Forum, Vols. 475-479, pp. 2987-2990, 2005

Online since:

January 2005

Export:

Price:

$38.00

[1] I.W. Chen, L.A. Xue: J. Am. Ceram. Soc. Vol. 73 (1990), p.2585.

[2] F. Wakai, Y. Kodama, S. Sakaguchi, N. Murayama, K. Izaki and K. Niihara: Nature Vol. 344(1990), p.421.

[3] X. Wu, I.W. Chen: J. Am. Ceram. Soc. Vol. 75 (1992), p.2733.

[4] I. W Chen, S.L. Huang: J. Am. Ceram. Soc. Vol. 75 (1992), p.1073.

[5] M. Mitomo, H. Hirotsuru, H. Suematsu and T. Nishimura: J. Am. Ceram. Soc. Vol. 78 (1995), p.211.

[6] C.M. Wang, M. Mitomo, T. Nishimura and Y. Bando: J. Am. Ceram. Soc. Vol. 80 (1997), p.1213.

[7] T. Rouxel, F. Wakai: J. Am. Ceram. Soc. Vol. 75 (1992), p.2363.

[8] L.A. Xue, I.W. Chen: J. Am. Ceram. Soc. Vol. 75 (1992), p.1085.

[9] R.J. Xie, M. Mitomo and G.D. Zhan: Journal of the European Ceramic Society Vol. 22 (2002), p.963.

[10] Fumihiro Wakai, Naoki Kondo and Yutaka Shinoda: Solid State & Material Science Vol. 4 (1999), p.461.

[11] G. F. Wang, K.F. Zhang and W. B. Han: Key Engineer Materials. Vol. 224-226 (2002), p.721.