Paper Title:
Effect of Sintering Process on Fabrication of Porous Si3N4/SiC Composites
  Abstract

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, Q. T. Phan, D. W. Seo, J. K. Lim, "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
$32.00
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