MANUFACTURE OF ULTRAFINE POWDER OF ZRO2

摘要

PURPOSE:To manufacture easily ultrafine powder of ZrO2 contg. Y2O3 by heating an alkaline aqueous soln. contg. zirconium carbonate and a proper percentage of yttrium carbonate under pressure, treating the resulting reaction product with an org. solvent to remove water, and carrying out drying. CONSTITUTION:An alkaline aqueous soln. contg. Zirconium carbonate and 2- 3.5mol% yttrium carbonate or yttrium oxide basing on the amount of zirconium carbonate or a slightly acidic or alkaline soln. prepared by suspending or partially dissolving zirconium hydroxide and/or yttrium hydroxide in said aqueous soln. is reacted in an autoclave at =130 deg.C under =2kg/cm2 gauge pressure to form a powdered mixture of zirconium oxide with yttrium oxide. The powder is separated from the mother liquor, an org. solvent having =about 110 deg.C b.p. is added to the powder, and water is removed by sufficient distillation under heating. The solvent is then separated, and the residue is dried to obtain ultrafine powder of a zirconium oxide-yttrium oxide mixture.