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

Abstract

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°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 8wt.% CaCO3–SiO2 show higher flexural strength and porosity. As the dextrin in the green body increases from 5 to 25wt.%, the flexural strength decreases from 107 to 45MPa with the porosity increasing from 36 to 54%.