Fabrication of Porous SiAlON Using Fe₂O₃ as Pore Former

Abstract:

Porous SiAlON ceramics were fabricated by carbo-thermal reduction nitridation method using Fe₂O₃ as pore former. Particle size effects of Fe₂O₃ were reported in this paper. The results showed that composites were composed by SiAlON, AlN and Iron Silicon phases. The median pore diameter of Sialon was affected by the composition and particle size of Fe₂O₃. The fracture mode of this material was intergranular. With the increase of Fe₂O₃ additions, the porosity of this materials increased. The bending strength of this material was reversely proportional to Fe₂O₃ particle size. The maximum bending strength of Porous materials with 30wt.% Fe₂O₃ additions (with a porosity about 65% and the pore size is about 1μm) could reach 22 MPa. The porous Sialon ceramics with a smaller pore size exhibited a higher bending strength.

• Periodical: Materials Science Forum (Volume 804)
• Pages: 267-270
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.804.267
• Online since: October 2014
• Authors: Qing Wen Duan, Rong Zhen Liu, Hai Yun Jin, Jian Feng Yang, Zhi Hao Jin
• Keywords: Microstructure, Porous Ceramics, SiAlON

References

[1] T. Ekström, M. Nygren: J. Am. Ceram. Soc., Vol. 75 (1992). p.259.

[2] F.L. Riley: J. Am. Ceram. Soc., Vol. 83 (2000). p.245.

[3] A. Sarikaya, F. Dogan: Ceram. Int., Vol. 39(2013). p.403.

[4] S. Yoshiyuki, K. Kazuyuki: J. Am. Ceram. Soc., Vol. 67(1984). p. c247.

[5] V.N. Antsiferov, V.G. Gilev: Refract. Ind. Ceram., Vol. 42(2001). p.57.

[6] Q.W. Duan: Mater. Sci. Forum, Vol. 724 (2012) p.347.

[7] M. Kalin, J. Vizintin: Mater. Sci. Eng. A, Vol. 281 (2000). p.28.