Abstract
Porous materials were prepared by stacking needle-like boehmite particles using a vacuum filtration. Uniform size of needle-like boehmite particles was prepared via hydrothermal treatment of a precursor gel. Boehmite aqueous suspensions with various pH values were prepared and vacuum-filtered to form porous bulk. Porous materials with uniform microstructures were obtained when the pH value of the suspension was adjusted to 9. The mechanical property of the porous boehmite was improved by heat treatment at 1000°C-1100°C with a slight change of the pore structure. Porous α-alumina was also prepared by heat treatment at higher temperatures. The porous α-alumina prepared from boehmite porous materials with uniform microstructure had a finer microstructure than that prepared from the as-prepared boehmite powder.
