Zirconium dioxide powder, processes for its preparation, its...

Details Zirconium dioxide powder, processes for its preparation, its... Zirconium dioxide powder, processes for its preparation, its...

C - Chemistry, Metallurgy

01

G

23/252

C01G 25/02 (2006.01) C04B 35/486 (2006.01)

Patent

CA 2026521

ABSTRACT An unstabilized or stabilized zirconium dioxide powder having good properties is obtained by a process in which zirconyl chloride and optionally a stabilizer or its precursor are melted in the presence of ammonium chloride, the melt is evaporated to dryness by evaporating off water and hydrogen chloride, the ammonium chloride is sublimed and the reaction product is calcined at elevated temperatures and optionally the residue is milled. The process avoids the use of aqueous solutions and the removal of precipitates which constitute major disadvantages of known processes. The zirconium dioxide powder so obtained is highly homogeneous and suitable for the production of sintered articles which can be subjected to high mechanical and/or thermal stresses.

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