Slip Casting of Alumina for Membrane Application
AbstractPorous alumina membranes were prepared from alumina matrix, polyvinyl alcohol binder (1â€“5%) and calcium carbonate additive (0â€“3%). The discâ€“shaped alumina samples were fabricated by slip casting process. The alumina paste was sintered at different temperatures of 1100, 1200, 1300 and 1400Â°C. The results showed that the porosity of the porous membrane reached 45%â€“46% at 1300Â°C sintering for the mixtures of alumina matrix with 3% PVA and alumina matrix with 2% CaCO3Â plus 3% PVA. The water permeability was 150 L/m2.h at 20 kPa and the hydraulic conductivity coefficient was 1.06 Ã— 10â€“9Â â€“ 2.43 Ã— 10â€“9Â msâ€“1Paâ€“1. The density, linear shrinkage water absorption and mechanical strength were ca. 3.92 g/cm3, 1.61â€“1.71% and 20.45â€“21.92%, 17.26â€“21 MPa, respectively. The SEM micrographs of alumina membrane using PVA binder showed a dense surface layers. An increase of the PVA binder resulted in a higher pure water fluxes and bigger pore sizes. An increase of CaCO3Â in a 3% PVA binder mixtures resulted in a little decrease of porosity but increase in linear shrinkage from 1.57 to 2.04% at 1300Â°C sintering.
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