Properties of porous alumina ceramics prepared by technique combining cold-drying and sintering

For preparing porous alumina ceramics with desired shapes easily, a simple and low-cost technique combining cold-drying and sintering was explored. The optimal temperature for preparing the porous alumina ceramics is 1350 degrees C. The contents of CaCO3-SiO2 and dextrin in the green body have great effects on the properties of porous alumina ceramics. Due to a uniform microstructure and small pore size, the porous alumina ceramics prepared from the green body with 8 wt.% CaCO3-SiO2 show higher flexural strength and porosity. As the dextrin in the green body increases from 5 to 25 wt.%, the flexural strength decreases from 107 to 45 MPa with the porosity increasing from 36 to 54%. (C) 2013 Elsevier Ltd. All rights reserved.