The invention discloses a preparation method for nanometer
yttrium oxide powder, belonging to the technical field of preparing superfine
rare earth powder. The method comprises the steps of dropping
yttrium-containing inorganic
acid salt in
alcohol-water
mixed solution which contains a precipitant and a static stabilizing agent, then adding a surfactant after finishing dropping, stirring, aging and separating the
reaction system to obtain precipitate, then carrying out cleaning and washing,
vacuum drying and calcinating to the precipitate to obtain the nanometer
yttrium oxide powder. According to the preparation method, by applying the
back titration,
alcohol-water mixture solution and surfactant, not only can yttrium ions be favorably separated out and crystallized, but also the particle size of the crystals and the specific surface area of the
crystal particles can be better controlled, so that the prepared nanometer yttrium
oxide powder has smaller particle size, narrow
particle size distribution and larger specific surface area, thus further having higher
sintering activity; the preparation method is simple in technology, short in synthesis
route, easy to control, capable of remarkably improving the purity and yield of products, and suitable for industrial production.