Fabrication of bimodal porous alumina ceramics

Effect of sintering temperature in preparation of granular ceramic filter

“…Many previous researchers have studied the relationship between pore characteristics and mechanical strength [9,24,25]. Han et al reported that the effect of sintering temperature on ceramic material strength could be analyzed by porosity and grain bonding area [25], and Wen et al reported that there was inversely proportional relationship between porosity and mechanical strength [26].…”

Processing of low-density alumina foam

“…10,11 Foams sintered at 1223 and 1873 K were in ␥-alumina and ␣-alumina phases, with theoretical densities of 3.71 and 3.98 g/cc, respectively. The calculated porosities of alumina foams sintered at 1223 and 1873 K were 99% and 98.5%, respectively.…”

“…Jayasinghe and Edirisinghe 9 synthesized alumina foam with 96% porosity by carbonizing alumina dispersed polyurethane foam prepared by electrospraying alumina-ethanol slurry on polyurethane foam. Han et al 10 reported preparation of alumina foam with 86% porosity combining the sponge method and the pore former technique. They reported synthesis of alumina foam from alumina slurry prepared by ball milling 95% alumina and 5% additives together, followed by addition of aqueous solution of 5% polyvinyl alcohol (PVA) and impregnated in polymeric sponge.…”

The effect of sago as binder in the fabrication of alumina foam through the polymeric sponge replication technique

“…Comparison was made for before and prior to compressive test. Han et al 18 states that, foams produced by PSRT are of low strength due to high porosity and thin struts, thus making them sensitive to structural stress. The compressive strength test demonstrated that sample with PVA (Al.6:4.PVA0.8) as binder fragmented after reaching the maximum loading stress.…”