Nanoscalar pyrogenically produced yttrium-zirconium mixed oxide
AssigneeDegussa AG
InventorsStipan Katusic, Günther Michael, Klaus Deller, Thomas Hennig, Susanne Reinhart, Andrea Tietze
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Abstract
Nanoscalar, pyrogenically produced yttrium-zirconium mixed oxide which has a BET surface area of between 1 and 600 m2/g, a total chloride content of less than 0.05 wt. % and does not exhibit a conversion into the monoclinic phase during storage is produced by atomizing yttrium compounds and zirconium compounds and reacting them in a flame. The mixed oxide can be used as ceramic raw material.
Claims9
Nanoscalar, pyrogenically produced yttrium-zirconium mixed oxide wherein the amount of Y2O3 present ranges from 3.0 to 5.7 wt. % based on the total mixed oxide, having a particle size of 12 to 20 nm, a BET surface area of 43 to 60 m2/g and a total chloride content of less than 0.05 wt. % and consists of a stable tetragonal phase which does not exhibit a conversion into the monoclinic phase during storage at room temperature, nor during calcination, wherein yttrium and zirconium compounds are converted into the mixed oxide in an oxyhydrogen flame.
Nanoscalar, pyrogenically produced yttrium-zirconium mixed oxide wherein the amount of Y2O3 present ranges from 3.0 to 5.7 wt. % based on the total mixed oxide, having a particle size of 12 to 20 nm, a BET surface area of between 43 to 60 m2/g and a total chloride content of less than 0.05 wt. % and consists of a stable tetragonal phase which does not exhibit a conversion into the monoclinic phase during storage at room temperature, nor during calcination,
- said mixed oxide having been produced by atomizing a yttrium compound and a zirconium compound in a high temperature reaction chamber which is a closed flow tube in an oxyhydrogen flame, optionally dissolved or dispersed in a solvent, and then converting said yttrium compound and said zirconium compound into a yttrium-zirconium mixed oxide in a flame at temperatures of above 200° C.
Dependencies are inferred from the claim text.