Slip Casting of Alumina for Membrane Application

Authors

  • B. Darunee Material Science Program, Membrane Science Technology Research Center, Faculty of Science, Prince of Songkla University (PSU), Songkhla 90112,Thailand
  • B. Tripob Department of Physics, Prince of Songkla University 90112, Thailand

DOI:

https://doi.org/10.11113/amst.v6i1.52

Abstract

Porous alumina membranes were prepared from alumina matrix, polyvinyl alcohol binder (1–5%) and calcium carbonate additive (0–3%). The disc–shaped alumina samples were fabricated by slip casting process. The alumina paste was sintered at different temperatures of 1100, 1200, 1300 and 1400°C. The results showed that the porosity of the porous membrane reached 45%–46% at 1300°C sintering for the mixtures of alumina matrix with 3% PVA and alumina matrix with 2% CaCO3 plus 3% PVA. The water permeability was 150 L/m2.h at 20 kPa and the hydraulic conductivity coefficient was 1.06 × 10–9 – 2.43 × 10–9 ms–1Pa–1. The density, linear shrinkage water absorption and mechanical strength were ca. 3.92 g/cm3, 1.61–1.71% and 20.45–21.92%, 17.26–21 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 CaCO3 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 1300°C sintering.

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Published

2017-11-20

How to Cite

Darunee, B., & Tripob, B. (2017). Slip Casting of Alumina for Membrane Application. Journal of Applied Membrane Science &Amp; Technology, 6(1). https://doi.org/10.11113/amst.v6i1.52

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