Effect of Sintering Process on Fabrication of Porous Si3N4/SiC Composites


Article Preview

Porous SiC/Si3N4 composites were fabricated by reaction between Si3N4 and C powder in 0.5 MPa nitrogen atmosphere at 1700oC, 1800oC and 1900oC for 0.5h, 1h and 2h, respectively. The characteristics of in situ porous Si3N4/SiC composites were further investigated by X-ray diffraction (XRD) and scanning electronic microscopy (SEM). Results show that the SiC particles are very fine. And the transformation from α-Si3N4 to β-Si3N4 is obvious at 1800oC for 2h and at 1900oC. Otherwise, at 1700oC, the formation of rod-like β-Si3N4 is inhibited. The compressive test was conducted at a cross-head speed of 0.5 mm/min to get the basic mechanical performance of the porous ceramics. The highest value of strength of these composites was obtained when sintered at 1800oC for 1h.



Key Engineering Materials (Volumes 353-358)

Edited by:

Yu Zhou, Shan-Tung Tu and Xishan Xie




C. H. Vu et al., "Effect of Sintering Process on Fabrication of Porous Si3N4/SiC Composites ", Key Engineering Materials, Vols. 353-358, pp. 1572-1575, 2007

Online since:

September 2007




[1] D. Hullmann, G. Wendt, G. Ziegenbalg, Chem. Eng. Technol., Vol 147 (2001) p.24.

[2] B.J. Ash, R.W. Siegel, L.S. Schadler, Macromolecules, Vol. 37 (2004), p.1358.

[3] J.J. Luo, I.M. Daniel, Compos. Sci. Technol., Vol. 63 (2003), p.1607.

[4] J.F. Yang, G.J. Zhang and T. Ohji, J. Mater. Res. 1, Vol. 16 (2001), pp. (1916).