Abstract
Gradient, porous alumina ceramics were prepared with the characteristics of microsized tabular α‐Al2O3 grains grown on a surface with a fine interlocking feature. The samples were formed by spin‐coating diphasic aluminosilicate sol on porous alumina substrates. The sol consisted of nano‐sized pseudo‐boehmite (AlOOH) and hydrolyzed tetraethyl orthosilicate [Si(OC2H5)4]. After drying and sintering at 1150°–1450°C, the crystallographic and chemical properties of the porous structures were investigated by analytical electron microscopy. The results show that the formation of tabular α‐Al2O3 grains is controlled by the dissolution of fine Al2O3 in the diphasic material at the interface. The nucleation and growth of tabular α‐Al2O3 grains proceeds heterogeneously at the Al2O3/glass interface by ripening nano‐sized Al2O3 particles.
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