Superplastic Sinter-Forging of Fine-Grained Si₃N₄-Si₂N₂O Composite at Low Temperature

Abstract:

The Si3N4- Si2N2O composites are fabricated with amorphous nano-sized silicon nitride powders by the liquid phase sintering (LPS) method. XRD analysis shows sintered body consists of β-Si3N4 and Si2N2O. SEM experiment conforms that the average grain size of sintered body is less than 300nm. 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 only 1550°C. Rod-shaped grains aligned along the perpendicular direction of pressure and the mechanical properties increase about 10% after the materials were forged.

• Periodical: Materials Science Forum (Volumes 551-552)
• Pages: 487-490
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.551-552.487
• Online since: July 2007
• Authors: Jun Ting Luo, Qing Zhang
• Keywords: Si₃N₄-Si₂N₂O, Sinter Forging, Superplasticity

References

[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.

DOI: 10.1038/344421a0

[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.