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http://dx.doi.org/10.4191/kcers.2015.52.6.449

Effect of Particle Size on Zirconia Gel-Casting Process  

Kim, In-Woong (Department of Advanced Materials Science and Engineering, Mokpo National University)
Lee, Sang-Jin (Department of Advanced Materials Science and Engineering, Mokpo National University)
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Abstract
The fabrication process of zirconia gel-casting was studied to obtain dense zirconia on a large scale or with complicated shapes. As an experimental parameter, two different particle sizes ($0.1{\mu}m$ and $0.7{\mu}m$) of zirconia powder were applied to the gel-casting process. The viscosity behavior of slurries incorporating 40 vol% of zirconia powder was examined as a function of the dispersant content and the solid load to determine the optimum dispersion conditions. In addition, the gelation time with an initiator, the de-binding behavior, and the main factors affecting densification were examined. The densification of the gel-casted zirconia green body depended on the mixing ratio between the monomer and the dimer and on the zirconia particle size. A green body with a small particle size of $0.1{\mu}m$ showed less densification, with a relative density of 93%. This may be due to the excess number of bubbles created through interactions between the larger particle surface and polymer additives during the ball-milling process.
Keywords
Zirconia; Gel-casting; Particle size; Densification; Dispersion;
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  • Reference
1 O. O. Omatete, M. A. Janney, and S. D. Nunn, "Gelcasting : From Laboratory Development Toward Industrial Production," J. Eur. Ceram. Soc., 17 [2-3] 407-13 (1997).   DOI
2 D. W. Richerson, Modern Ceramic Engineering; pp. 178-216, Marcel Dekker, New York, 1982.
3 J. F. Young, R. S. Shane, Material and Processes; pp. 1441-1472, Marcel Dekker, New York, 1984.
4 B. H. Ryu, J. W. Kim, D. J. Kim, and J. D. Lee, "Effect of Organic Additives on Fluidity of Gel casting Ceramic Slip," Theories and Applications of Rheology, 4 [1] 100-3 (2000).
5 C. G. Ha, J. W. Kim, C. Y. Jo, U. G. Paik, and Y. G. Jung, "Effects of Particle Size on Processing Variables and Green Microstructure in Gelcast Alumina Green Bodies," Korean J. Mater. Res., 11 [10] 869-78 (2001).
6 O. O. Omatete and A. Bleier, "Tailoring Suspension Flow for the Gelcasting of Oxide and Nonoxide Ceramics," Mat. Res. Soc. Symp. Proc., 346 357-63 (1994).   DOI
7 A. Bleier, O. O. Omatete, and C. G. Westmoreland, "Rheology of Zirconia-Alumina Gelcasting Slurries," Mat. Res. Soc. Symp. Proc., 271 269-75 (1992).   DOI
8 S. E. Yun, S. K. Woo, K. Bae, and D. P. Kim, "Effect of Chemical Parameters on Aqueous Acrylamide Gelcasting," J. Korean Ind. Eng. Chem., 10 [5] 748-53 (1999).
9 T. A. Ring, Fundamentals of Ceramic Powder Processing and Synthesis; Vol. 10, pp. 421-493, Academic Press, Utah, 1996.
10 A. Roosen and H. K. Bowen, "Influence of Various Consolidation Techniques on the Green Microstructure and Sintering Behavior of Alumina Powders," J. Am. Ceram. Soc., 71 [11] 970-77 (1988).   DOI
11 C. J. Oh and H. L. Lee "Microstructures and Drying of the Alumina Green Body by the Gel-Casting Method," J. Korean Ceram. Soc., 31 [12] 1467-74 (1994).
12 A. C. Young, O. O. Omatete, M. A. Janney, and P. A. Menchhofer, "Gelcasting of Alumina," J. Am. Ceram. Soc., 74 [3] 612-18 (1991).   DOI