Abstract
Cellular alumina foams with porosity of 93.3–94.4% were fabricated by thermo-foaming of powder dispersions in molten d-glucose anhydrous. Up to 8wt% microsilica was added to ceramic mixtures to explore its effect on the microstructure and properties of the sintered foams. The dispersions revealed a shear thinning and viscosity of the dispersions increased as microsilica addition increased. The shrinkage of samples decreased from 19.70% to 17.82%, the densities of samples decreased from 0.267 to 0.206g/cm3 and compressive strength decreased from 1.65 to 0.96MPa when microsilica addition increased from 0 to 8wt%. Furthermore, the curves of cell size distribution had a transformation from bimodal to unimodal and the amount of small windows in the foam reduced due to the addition of microsilica.
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