材料科學與工程學系韋文誠2008-02-252018-06-282008-02-252018-06-282008-02http://ntur.lib.ntu.edu.tw//handle/246246/64140Gradient, porous alumina ceramics were prepared with the characteristics of micro-sized tabular alpha-Al2O3 grains grown on a surface with a fine interlocking feature. The samples were made by spin-coating diphasic aluminosilicate sol on porous alumina substrates. The sol consisted of nano-sized pseudo-boehmite (AlOOH) and hydrolyzed TEOS [Si(OC2H5)4]. After drying and sintering at 1150-1450oC, the crystallographic and chemical properties of the porous structures were investigated by analytical electron microscopy (AEM). The results show that the formation of tabular alpha-Al2O3 grains is controlled by the dissolution of fine Al2O3 in the diphasic material at the interface. The nucleation and growth of tabular alpha-Al2O3 grains proceeds heterogeneously at the Al2O3/glass interface by ripening nano-sized Al2O3 particles.1104182 bytesapplication/pdfen-USAl2O3, Aluminosilicate, porous, anisotropy, grain growthjournal articlehttp://ntur.lib.ntu.edu.tw/bitstream/246246/64140/1/2008-JACerS-Tablular AlO.pdf