Preparation of monodispersed zirconia from solution
Conditions for the preparation of zirconia powders from solutions were investigated. Variations of reaction parameters, e.g. concentration of the precursor, rations of water, nitric acid, acetylacetone and hydroxypropylcellulose, sequence of addition and temperature, led to the precipitation of monodispersed particles. According to an increasing concentration of acetylacetone, the mean diameters rose from about 600 nm up to 2.5 mym. Calcination of the dried amorphous powders caused transformations to tetragonal zirconia in the range of 400 - 500 degree C and to monoclinic zirconia at about 700 degree C and is accompanied by a weight loss of 42 - 44 % and a linear shrinkage of up to 40%.