Abstract
Tailored made open-cell alumina–vanadia foams were produced by employing a dissolution sintering process, using crystalline raw cane sugar as a leachable pore former material. The process parameters of the production stages were properly adjusted to optimize the quality and structure of open-cell ceramic foams. The influence of sintering conditions (temperature, time and cooling rate) on the microstructure of the resultant foam is investigated with a view to produce high-quality ceramic foams having satisfactory strength. The effects of V 2 O 5 molar addition on the microstructure of ceramics foams are described by SEM and XRD analyses. The crystal size, grain growth (appearance of texturing-preferred orientation) and X-ray intensities of phases are closely related to the cooling rate and sintering duration. V 2 O 5 addition enlarges the lattice parameters of the Al 2 O 3 phase resulting in a 4–5% increase of the actual (measured) porosity of the produced ceramic foam compared to the theoretical one.
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