Fabrication of α-Sialon Nano-Ceramics

Abstract:

Article Preview

Y- α-sialon (m=1.35, n=0.675) ceramics were prepared by high-energy mechanical milling followed by spark plasma sintering. The milling promoted not only liquid-phase sintering, but also phase transformation from β-Si3N4 to α-sialon. Under the same holding time of 5 min, milled powder could be completely densified at 1500oC, which is about 250oC lower than that required for as-received powder. The temperature where the phase transformation finished was 1600oC and 1750oC for milled and as-received powder, respectively. The grain size of obtained dense ceramics from milled powder was significantly decreased. Nano-sized dense ceramics have been obtained by sintering the milled powder at 1500oC for 5 min. Although 100 % α-sialon has not been achieved, the nano-sized ceramics can be used for superplastic deformation, taking advantage of small grain size and large amount of transient liquid phase.

Info:

Periodical:

Key Engineering Materials (Volumes 317-318)

Edited by:

T. Ohji, T. Sekino and K. Niihara

Pages:

629-632

DOI:

10.4028/www.scientific.net/KEM.317-318.629

Citation:

X. Xu et al., "Fabrication of α-Sialon Nano-Ceramics ", Key Engineering Materials, Vols. 317-318, pp. 629-632, 2006

Online since:

August 2006

Export:

Price:

$35.00

[1] G.Z. Cao and R. Metselaar: Chem. Mater. Vol. 3 (1991), p.242.

[2] S.L. Hwang, H.T. Lin, P.F. Becher: J. Mater. Sci. Vol. 30 (1995), p.6023.

[3] L.O. Nordberg and T. Ekstrom: J. Am. Ceram. Soc. Vol. 78 (1995), p.797.

[4] I.W. Chen and A. Rosenflanz: Nature Vol. 389 (1997), p.701.

[5] S. Kurama, M. Herrmann and H. Mandal: J. Eur. Ceram. Soc. Vol. 22 (2002), p.109.

[6] J. Karch, R. Birringer and H. Gleiter: Nature, vol. 330 (1987), p.556.

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

[8] B.N. Kim, K. Hiraga, K. Morita and Y. Sakka: Nature, Vol. 413 (2001), p.288.

[9] F. Wakai, Y. Kodama, S. Sakaguchi, etc. Nature, Vol. 344 (1990), p.421.

[10] X. Xu, T. Nishimura, N. Hirosaki, R.J. Xie, Y.C. Zhu, Y. Yamamoto, J. Am. Ceram. Soc. Vol. 88 (2005), p.934.

In order to see related information, you need to Login.