Abstract
Al2O3-15vol%ZrO2 composites were produced by colloidal process. Dispersed suspensions consisting of α-Al2O3 and ZrO2 fine powders were prepared by adjusting the pH value and salt concentration, or adding appropriate amounts of polyelectrolyte. The dispersion of powder particles was characterized by rheological measurement. In multicomponent particle systems, long range particle segregation occurs due to different particle size and specific gravity. The segregation decreases with increasing the salt concentration and/or solid content in the suspensions. The suspensions were consolidated by slip casting and cold isostatic pressing (CIP). They were sintered at temperatures from 1573K to 1793K for 2h in air. The microstructures were observed by SEM. For the specimen sintered at 1673K, the density was more than 98% and the grain size of Al2O3 matrix was 0.42μm. At 1723K, the density was about 99.5% and the grain size was 0.59-0.70μm.
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