Abstract
In order to synthesize the fine composite oxide powder with uniform composition and good sinterability, reduce the alkaline effluent, and increase the process flexibility by shorten the precipitation time, improvement of the homogeneous precipitation method using the reductant generated by hydrolysis of urea is investigated. Yttria-stabilized zirconia (YSZ) fine powder, which is representative of complex oxide consisting of multiple metal ion, is synthesized by the homogenous precipitation method under high pressure in an autoclave with the microwave irradiation heating. Effects of microwave irradiation heating on microstructure, size, composition uniformity, and sinterability of the powder particles are elucidated. By using the improved method, the hydroxide powder, which is a precursor of the YSZ powder, is generated quickly even when the amount of urea used is not large excess. The YSZ powder particle synthesized by this method is fine and has the uniform composition and good sinterability.
