Abstract
Alumina-doped yttria-stabilized zirconia (ADYSZ) nanopowders were prepared by microwave-assisted peroxyl-complex coprecipitation (MAPCC) using ZrOCl 2·8H 2O, Y 2O 3 and AlCl 3·6H 2O as starting materials, NH 3·H 2O as precipitant and H 2O 2 as complexant. The effects of adding H 2O 2 and microwave drying on the preparation and properties of ADYSZ were investigated. The precursors and nanopowders were studied by EDX, XRD, SEM and TEM techniques. The results show that the uniformity of component distribution within ADYSZ nanopowders is improved by adding appropriate dosage of H 2O 2. Complexing reaction between H 2O 2 and Zr 4+ ion restrains the hydrolyzation and precipitation of Zr 4+ ion. With the addition of H 2O 2, Al 3+, Y 3+ and Zr 4+ ions can be precipitated synchronously in a relatively narrow range of pH value. H 2O 2 also improves the filterability of the wet precipitate. The highly hydrophilic precipitates can be quickly and effectively separated from aqueous solution. During microwave drying process, the moisture of wet precursors is selectively heated. Quick expansion of steam vapor within the wet colloidal particles causes the aggregations burst into numerous tiny lumps. Compared with oven drying, microwave drying can not only shorten drying time but also reduce aggregation intensity of the resultant ADYSZ nanopowders.
Published Version
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