Surface-modification of Alumina Bubble

A wet chemical method was cidopted to introduce alumina sol to surface-modification of alumina bubble and in-situ decomposition characteristics, distribution of alumina sol, mi-crostructure and mechanical properties of surface-modified alumina bubble were studied by SEM, XRD, Coulter LS Particle Size Analyzer and self-preparation experimental device for measurement of compressive resistance. The results showed that the alumina sol formed film on the surface, filtered into and distributed on the pore and crack of alumina bubble. After heat-treatment at 500-900℃, the alumina sol can in-situ decompose to high active 7-Al2O3 powder, compressive resistance of surface-modified alumina bubble was heightened from 15.6N to 30.2N after sintering at 1550℃.