Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Preparation of Porous Mullite Composites through Recycling of Coal Fly Ash

석탄회의 재활용을 통한 다공질 뮬라이트 복합체의 제조

  • Kim, Won-Young (School of Materials Science and Engineering, Pusan National University) ;
  • Ji, Hyung-Bin (School of Materials Science and Engineering, Pusan National University) ;
  • Yang, Tae-Young (School of Materials Science and Engineering, Pusan National University) ;
  • Yoon, Seog-Young (School of Materials Science and Engineering, Pusan National University) ;
  • Park, Hong-Chae (School of Materials Science and Engineering, Pusan National University)
  • Published : 2010.03.31
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Abstract

Porous mullite/alumina composites have been fabricated by a freeze casting technique using TBA-based coal fly ash/alumina slurry. After sintering, unidirectional macropore channels aligned regularly along the TBA ice growth direction were developed; simultaneously, small sized micropores fromed in the outer walls of the pore channels. The physical and mechanical properties (e.g. porosity and compressive strength) of the sintered porous composites were roughly dependant of processing conditions, due to the complexity of the factors affecting them. However, with increasing solid loading and sintering temperature, the compressive strength generally increased and the porosity decreased. After sintering $1500^{\circ}C$ for 2 h, the porous specimen (porosity: 52.1%) showed a maximum compressive strength of 70.0 MPa.

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References

  1. I. A. Akasy and J. A. Pask, “Stable and Metastable Equilibria in the System $SiO_2-Al_2O_3$,” J. Am. Ceram. Soc., 58 507-12 (1975). https://doi.org/10.1111/j.1151-2916.1975.tb18770.x
  2. R. W. Rice, “Porosity of Ceramics”; p. 539, Marcel Dekker Inc, New York, 1998.
  3. M. Scheffler and P. Colombo, “Cellular ceramics: Structure, Manufacturing, Properties and Applications”; p. 645, Wiley-VCH, Weinheim, 2005.
  4. L. J. Gauckler, M. M. Waeber, C. Conti, and M. Hacobduliere, “Ceramic Foam for Molten-Metal Filtration,” J. Metals, 37 47-50 (1985).
  5. A. R. Studart, U. T. Gonzenbach, E. Tervoort, and L. J. Gauckler, “Processing Routes to Macroporous Ceramics: A Review,” J. Am. Ceram. Soc., 89 1771-89 (2006). https://doi.org/10.1111/j.1551-2916.2006.01044.x
  6. T. Fukasawa, M. Ando, T. Ohji, and S. Kanzaki, “Synthesis of Porous Ceramics with Complex Pore Structure by Freeze-Dry Processing,” J. Am. Ceram. Soc., 84 230-32 (2001). https://doi.org/10.1111/j.1151-2916.2001.tb00638.x
  7. T. Montz and H. J. Richter, “Ceramic Bodies with Complex Geometries and Ceramic Shells by Freeze Casting Using Ice as Mold Material,” J. Am. Ceram. Soc., 89 2394-98 (2006). https://doi.org/10.1111/j.1551-2916.2006.01081.x
  8. Y. H. Koh, J. H. Song, E. J. Lee, and H. E. Kim, “Freezing Dilute Ceramic/Camphene Slurry for Ultra-High Porosity Ceramics with Completely Interconnected Pore Networks,” J. Am. Ceram. Soc., 89 3089-93 (2006). https://doi.org/10.1111/j.1551-2916.2006.01222.x
  9. A. Macchetta, I. G. Turner, and C. R. Bowen, “Fabrication of HA/TCP scaffolds with a graded and Porous Structure Using a Camphene-based freeze-casting Method,” Acta Biomater., 5 1319-27 (2009). https://doi.org/10.1016/j.actbio.2008.11.009
  10. K. Araki and J. W. Halloran, “Room-Temperature Freeze Casting for Ceramics with Nonaqueous Sublimable Vehicles in the Naphthalene-Camphor Eutectic Ststem,” J. Am. Ceram. Soc., 87 2014-9 (2004).
  11. R. Chen, C. A. Wang, Y. Huang, L. Ma, and W. Lin, “Ceramics with Special Porous Structures Fabricated by Freeze-Gelcasting: Using tert-Butyl Alcohol as a Template,” J. Am. Ceram. Soc., 90 3478-84 (2007). https://doi.org/10.1111/j.1551-2916.2007.01957.x
  12. R. Chen, Y. Huang, C. A. Wang, and J. Qi, “Ceramics with Ultra-Low Density Fabricated by Gelcasting: An Unconventional View,” J. Am. Ceram. Soc., 90 3424-29 (2007). https://doi.org/10.1111/j.1551-2916.2007.01915.x
  13. H. Schneider, K. Okada, and J. Pask, “Mullite and Mullite Ceramics”; p. 158, John Wiley & Sons, New York, 1977.
  14. B. M. Kim, Y. K. Cho, S. Y. Yoon, R. Stevens, and H. C. Park, “Mullite Whiskers Derived from Kaolin,” Ceram. Inter., 35 579-83 (2009). https://doi.org/10.1016/j.ceramint.2008.01.017

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