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J. Korean Ceram. Soc. > Volume 52(3); 2015 > Article
Journal of the Korean Ceramic Society 2015;52(3): 180.
doi: https://doi.org/10.4191/kcers.2015.52.3.180
Effect of Alkaline-Earth Oxide Additives on Flexural Strength of Clay-Based Membrane Supports
Young-Il Lee, Jung-Hye Eom1, Young-Wook Kim1, In-Hyuck Song2
Department of Optometry and Vision Science, Dongnam Health University
1Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul
2Engineering Ceramics Group, Korea Institute of Materials Science
ABSTRACT
Low-cost ceramic membrane supports with pore sizes in the range of $0.52-0.62{mu}m$ were successfully prepared by uniaxial dry compaction method using inexpensive raw materials including kaolin, bentonite, talc, sodium borate, and alkaline-earth oxides in carbonate forms (e.g., $MgCO_3$, $CaCO_3$, and $SrCO_3$). The prepared green supports were sintered at $1000^{circ}C$ for 8 hr in air. The effect of alkaline-earth oxide additives on the flexural strength of clay-based membrane supports was investigated. The porosity of the clay-based membrane supports was found to be in the range of 33-34%. The flexural strength of the clay-based membrane supports with 1% alkaline-earth carbonates was found to be in the range of 42.8-52.7 MPa. The addition of alkaline-earth carbonates to clay-based membrane supports resulted in large increases (47-80%) in the flexural strength of the membrane supports, compared to that of membrane supports without alkaline-earth carbonates. The typical flexural strength of the clay-based membrane support with 1% $SrCO_3$ was 52.7 MPa at 33.8% porosity.
Key words: Membranes, Alkaline earth oxides, Clay, Porosity, Strength
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