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

Abstract:

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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.

Info:

Periodical:

Key Engineering Materials (Volumes 353-358)

Edited by:

Yu Zhou, Shan-Tung Tu and Xishan Xie

Pages:

1572-1575

DOI:

10.4028/www.scientific.net/KEM.353-358.1572

Citation:

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

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Price:

$35.00

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