초록 ▼

A process for manufacturing fine zirconium oxide powder comprises adding a hydroxide of at least one metal selected from calcium, magnesium, yttrium and a lanthanide series element to a zirconia sol, which is dehydrated, dried and calcined. A zirconia sol prepared by hydrolyzing under heating an aqu

A process for manufacturing fine zirconium oxide powder comprises adding a hydroxide of at least one metal selected from calcium, magnesium, yttrium and a lanthanide series element to a zirconia sol, which is dehydrated, dried and calcined. A zirconia sol prepared by hydrolyzing under heating an aqueous solution containing a zirconium salt, zirconium hydroxide or zirconia hydrate and then filtering the hydrolized aqueous solution through a ultra-filtration membrane is preferably used.

대표청구항 ▼

A process for manufacturing fine zirconia oxide powder, which comprises: preparing a zirconia sol, wherein the zirconia sol is obtained by hydrolyzing with heat an aqueous solution containing a member selected from the group consisting of zirconium salt, zirconium hydroxide and zirconia hydrate and

A process for manufacturing fine zirconia oxide powder, which comprises: preparing a zirconia sol, wherein the zirconia sol is obtained by hydrolyzing with heat an aqueous solution containing a member selected from the group consisting of zirconium salt, zirconium hydroxide and zirconia hydrate and then filtering the thus hydrolyzed aqueous solution by way of an ultra-filtration membrane, adding a metal hydroxide of at least one metal selected from the group consisting of calcium, magnesium, yttrium and lanthanide series elements to the zirconia sol, dehydrating or drying the zirconia sol containing said metal hydroxide, and calcining the dehydrated or dried zirconia sol to obtain fine zirconium oxide powder, wherein the zirconia sol is a sol of zirconia having a particle size of from 500 to 5000 A.