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Viscosity Study to Optimize a Slurry of Alumina Mixed with Hollow Microspheres

Bukhari, Syed Zaighum Abbas;Ha, Jang-Hoon;Lee, Jongman;Song, In-Hyuck

  • Received : 2015.08.07
  • Accepted : 2015.10.16
  • Published : 2015.11.30

Abstract

Porous alumina ceramics are involved in many industrial applications due to the exceptional properties of these products. This study addresses the preparation of porous alumina ceramics using hollow microspheres as a pore-forming agent and slip casting as a green-body-forming technique. A uniform distribution of pores is a basic requirement of a porous material. This study investigates three different slurry systems, i.e., as-prepared alumina slurry, alumina slurry electrostatically dispersed by hydrochloric acid (HCl), and slurry dispersed by the commercial dispersant 'Darvan C-N'. At a low viscosity, the hollow microspheres in the slurry tend to float, which causes a non-uniform pore distribution. To avoid this phenomenon, the viscosity of the slurry was increased to the extent that the movement of hollow microspheres ceased in the slurry. As a result, a uniform pore distribution was achieved.

Keywords

Porous materials;Alumina;Slip casting;Viscosity

References

  1. C. Cybulski and J. A. Moulijna, "Monoliths in Heterogeneous Catalysis," Cat. Rev. Sc. Eng., 36 [2] 179-270 (1994). https://doi.org/10.1080/01614949408013925
  2. E. J. Granite and T. O'Brien, "Review of Novel Methods for Carbon Dioxide Separation from Flue and Fuel Gases," Fuel Proc. Tech., 48 [14] 1423-34 (2005).
  3. A. Okada, "Automotive and Industrial Applications of Structural Ceramics in Japan," J. Eur. Ceram. Soc., 28 [5] 1097-4 (2008). https://doi.org/10.1016/j.jeurceramsoc.2007.09.016
  4. C. Piconi and G. Maccauro, "Zirconia as a Ceramic Biomaterial," Biomaterials, 20 [1] 1-25 (1999). https://doi.org/10.1016/S0142-9612(98)00010-6
  5. K. Ishizaki, S. Komarneni, and M. Nanko, Porous Materials; Vol. 4, pp. 1-5, Springer-Science & Business Media, Germany, 1998.
  6. Y. Imanaka, Multilayered Low Temperature Cofired Ceramics (LTCC) Technology; pp. 21-58, Springer Science & Business Media, Germany, 2005.
  7. T. Ohji and M. Fukushima, "Macro-porous Ceramics: Processing and Properties," Int. Mat. Rev., 57 [2] 115-31 (2012). https://doi.org/10.1179/1743280411Y.0000000006
  8. P. Colombo, "Conventional and Novel Processing Methods for Cellular Ceramics," Phil. Trans. R. Soc. A, 364 [1838] 109-24 (2006). https://doi.org/10.1098/rsta.2005.1683
  9. H. Wang, X. Li, J. Yub, and D. Kim, "Fabrication and Characterization of Ordered Macroporous PMS-derived SiC from a Sacrificial Template Method," J. Mater. Chem., 14 [9] 1383-86 (2004). https://doi.org/10.1039/b313405a
  10. J. Eom, Y. Kim, I. H. Song, and H. D. Kim, "Processing and Properties of Polysiloxane-derived Porous Silicon Carbide Ceramics Using Hollow Microspheres as Templates," J. Eur. Ceram. Soc., 28 [5] 1029-35 (2008). https://doi.org/10.1016/j.jeurceramsoc.2007.09.009
  11. J. Andertova, J. Havrda, and R. Tlaskal, "Preparation of Functionally Graded Alumina Ceramic Materials with Controlled Porosity," Stud. Surf. Sci. and Cat., 160 629-37 (2007). https://doi.org/10.1016/S0167-2991(07)80081-4
  12. D. J. Kim, H. Kim, and J. K. Lee, "Dependence of the Rheological Behavior of Electrostatically Stabilized Alumina Slurries on pH and Solid Loading;" J. Mater. Sci., 33 [11] 2931-35 (1998). https://doi.org/10.1023/A:1004398428917
  13. P. Singh, R. Menchavez, C. Takai, M. Fuji, and M. Takahashi, "Stability of Dispersions of Colloidal Alumina Particles in Aqueous Suspensions," J. Coll. Inter Sci., 291 [1] 181-86 (2005). https://doi.org/10.1016/j.jcis.2005.04.091
  14. A. Tsetsekou, C. Agrafiotis, and A. Milias, "Optimization of the Rheological Properties of Alumina Slurries for Ceramic Processing Applications, Part I: Slip-casting," J. Eur. Ceram. Soc., 21 [3] 363-73 (2001). https://doi.org/10.1016/S0955-2219(00)00185-0
  15. P. Singh, S. Bhattacharjee, L. Besra, and D. K. Sengupta, "Evaluation of Dispersibility of Aqueous Alumina Suspension in Presence of Darvan C," Ceram Int., 30 [6] 936-46 (2004).
  16. R. M. Anklekar, S. A. Borkar, S. Bhattacharjee, C. H. Page, and A. K. Chatterjee, "Rheology of Concentrated Alumina Suspension to Improve the Milling Output in Production of High Purity Alumina Powder," Colloids Surf. A., 133 [1-2] 41-7 (1998). https://doi.org/10.1016/S0927-7757(97)00110-6
  17. T. Fengqiu, H. Xiaoxian, Z. Yufeng, and G. Jingkun, "Effect of Dispersants on Surface Chemical Properties of Nano-zirconia Suspensions," Ceram Int., 26 [5] 93-7 (2000). https://doi.org/10.1016/S0272-8842(99)00024-3
  18. R. Greenwood and L. Bergstrom, "Electroacoustic and Rheological Properties of Aqueous $Ce-ZrO_2$(Ce-TZP) Suspensions," J. Eur. Ceram. Soc., 17 [4] 537-48 (1997). https://doi.org/10.1016/S0955-2219(96)00097-0

Acknowledgement

Supported by : Korea Institute of Materials Science (KIMS)