Low-Temperature Sintering of SiC Reticulated Porous Ceramics Using Al₂O₃-SiO₂ as Sintering Aids

Abstract:

Currently, one of the most popular methods for the production of reticulated porous ceramics (RPCs) is the polymer sponge method, which was invented by Schwartzwalder and Somers. SiC RPCs can be fabricated by using the A1₂O₃-SiO₂ as sintering aids at low temperature as 1200-1300 °C in cases with SiC (20-50 % (mass percent)). However, when the content of SiC powders (relative to total weight of solids) was higher than 50 % (mass percent), the most suitable sintering temperature was higher than 1400 °C. In this work, SiC reticulated porous ceramics (SiC RPCs) was fabricated via the polymer sponge method using Al₂O₃-SiO₂ as sintering aids at 1100-1500 °C. In order to obtain SiC RPCs with optimized mechanical performance, the properties of the slurry and influence of sintering temperature have been investigated. It was found that, rheological properties, solid content of the slurry and sintering temperature all have influence on the physical and mechanical properties of SiC RPCs. In order to achieve optimal properties of SiC RPCs, the optimal pH value ,solid content, sintering temperature and content of silica fume were 11, 73.4 % (mass percent), 1300 °C and 17 % (mass percent), respectively.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 216-220
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.216
• Online since: March 2014
• Authors: Jing Zhao, Hong Qiang Ru*, Wei Wang, Xin Yan Yue
• Keywords: Mechanical Property, Rheological Property, SiC Reticulated Porous Ceramics, Sintering Temperature

References

[1] M.D.M. Innocentini, V.R. Salvini, V.C. Pandolfelli, The permeability of ceramic foams, Am. Ceram. Soc. Bull. 78(1999) 78-84.

[2] P. Sepulveda, Gelcasting foams for porous ceramics, Am. Ceram. Soc. Bull. 76 (1997) 61-65.

[3] Z. Taslicukur, C. Balaban, N. Kuskonmaz, Production of ceramic foam filters for molten metal filtration using expanded polystyrene, J. Eur. Ceram. Soc. 27 (2007) 637-640.

DOI: 10.1016/j.jeurceramsoc.2006.04.129

[4] K. Schwartzwalder, A.V. Somers, U.S. Patent 3, 090, 094. (1963).

[5] X. Zhu, D. Jiang, S. Tan, Preparation of Silicon Carbide reticulated porous ceramics, Mater. Sci. Eng. A, 323 (2002) 232-238.

DOI: 10.1016/s0921-5093(01)01352-1

[6] X.M. Yao, S.H. Tan, Z.R. Huang, D.L. Jiang, Low-temperature sintering of SiC reticulated porous ceramics with MgO-Al2O3-SiO2 additives as sintering aids, J. Mater. Sci. 42(2007) 4960-4966.

DOI: 10.1007/s10853-006-0473-1

[7] X.M. Yao, Y. Yang, X.J. Liu, et al., Effect of recoating slurry compositions on the microstructure and properties of SiC reticulated porous ceramics, J. Eur. Ceram. Soc. 33(2013) 2909-2914.

DOI: 10.1016/j.jeurceramsoc.2013.04.007

[8] U.F. Vogt, M. Gorbar, P. Dimopoulos-Eggenschwiler, Improving the properties of ceramic foams by a vacuum infiltration process, J. Eur. Ceram. Soc. 30 (2010) 3005-3016.

DOI: 10.1016/j.jeurceramsoc.2010.06.003

[9] F. Rodríguez-Rojas, A.L. Ortiz, O. Borrero-López, F. Guiberteau, Effect of the sintering additive content on the protective passive oxidation behaviour of pressureless liquid-phase-sintered SiC, J. Eur. Ceram. Soc. 32 (2012) 3531-3536.

DOI: 10.1016/j.jeurceramsoc.2012.05.004

[10] M.D. Sacks, N. Bozkurt, G.W. Scheiffele, Fabrication of mullite and mullite-matix composites by transient viscous sintering of composites powders, J. Am. Ceram. Soc. 74 (1991) 2428.

DOI: 10.1111/j.1151-2916.1991.tb06780.x