| 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 |
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| ABSTRACT |
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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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