Optimization of α-SiAlON Microstructure by Heat Treatment


Article Preview

Nd-doped α-SiAlON starting composition (Nd0.33Si9.38Al2.62O1.62N14.38) was prepared by gas pressure sintering at 1825°C for 3 hrs. In order to explore the effect of post heat treatment on the developments of elongated α-SiAlON grains, sample was heat treated at 1800°C for 4-12 hrs. It was found that post heat treatments promoted formation of the elongated α-SiAlON grains. The controlling mechanism of grain growth was determined via plotting on a graph the growth in width/length versus time graphics using Image Analysis method. Different growth rates were found between the length and width direction of the α-SiAlON crystals, resulting in anisotropic grain growth in the microstructural development.



Key Engineering Materials (Volumes 368-372)

Edited by:

Wei Pan and Jianghong Gong




S. Kurama, "Optimization of α-SiAlON Microstructure by Heat Treatment", Key Engineering Materials, Vols. 368-372, pp. 891-893, 2008

Online since:

February 2008





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

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

[3] H. Zhao, S. Swenser and Y.B. Cheng: J. Eur. Ceram. Soc. 18 (1998) p.1053.

[4] Z.J. Shen, L.O. Nordberg, M. Nygren et al. in:G.N. Babini (Ed. ), Engineering Ceramics'96: Higher Reliability through Processing, Kluwer Academic Publishers, 1997, p.169.

[5] S. Kurama and H. Mandal: Key Eng. Mater. Vol. 264-268 (2004) p.1103.

[6] W. Chen, W. Sun, Y. Li and D. Yan: Mater. Lett. 46 (2000) p.343.

[7] S. Kurama, M. Herrmann and H. Mandal: J. Europ. Ceram. Soc. 22.

[1] (2002) p.109.

[8] S. Kurama, M. Herrmann and H. Mandal: Key Eng. Mater. Vol. 206-213 (2002) p.1009.

[9] C. Wood, H. Zhao, and Y.B. Cheng: J. Am. Ceram. Soc. 82.

[2] (1999) p.421.

[10] I. M. Lifshitz and V. V. Slyozov: J. Phys. Chem. Solids 19 [1/2] (1961) p.35.

[11] C. Wagner: Electrochem. 65 (1961).