YTTRIUM-ZIRCONIUM MIXED OXIDE POWDER

摘要

Nano-scale yttrium-zirconium mixed oxide powder in the form of aggregated primary particles having the following physico-chemical parameters: - BET surface area: from 40 to 100 m<SUP>2</SUP>/g, - d<SUB>n</SUB>= from 3 to 30 nm, d<SUB>n</SUB>= mean, number-related primary particle diameter, - yttrium content, calculated as yttrium oxide Y<SUB>2</SUB>O<SUB>3</SUB>, determined by chemical analysis, from 5 to 15 wt.%, based on the mixed oxide powder, - yttrium contents of individual primary particles, calculated as yttrium oxide Y<SUB>2</SUB>O<SUB>3</SUB> determined by TEM EDX, corresponding to the content in the powder +-10%, - content at room temperature, determined by X-ray diffraction and based on the mixed oxide powder - monoclinic zirconium oxide from <1 to 10 wt.% - tetragonal zirconium oxide from 10 to 95 wt.% - the content of monoclinic zirconium oxide after 2 hours' heating at 1300°C being less than 1 wt.%, - carbon content less than 0.2 wt.%. It is prepared by atomising a solution of an organic solvent containing an organic zirconium oxide precursor and an inorganic yttrium oxide precursor, burning in a combustion gas/air flame, separating gases and solid product. It can be used as a ceramics base material.