Study on dispersion behavior of Al2O3/ZrO2 composite powder

Nano-composite used widely with the development of nano technology, and the dispersion of different composition is important. ZrO2 often used as the second phase to improve the toughness of Al2O3 ceramics([1,2]). Nano Al2O3 and ZrO2 are added to water to prepare suspension, and PVP was used as dispersant to improve the dispersion of suspension. The suspension of Al2O3 and ZrO2 adjusted from 2 to 11 with the addition of dispersant is 0.5%. The flocculation of suspension was observed after 3h, 6h, 12h and 24h. Result shows that two kinds suspension dispersant better in acid liquid than in alkaline and natural liquid. The pH values that are choose as the best dispersion and flocculation are 5 and 7. Morphology and element distribution of composite powder are tested in the SEM. Results show that the composite powder is finely disseminated.