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 2026523

ABSTRACT By melting zinconyl chloride optionally with a stabilizer and reacting the chloride with gaseous ammonia, eva- porating off water and, if appropriate, hydrogen chloride, subliming ammonium chloride at elevated temperature, calcining the reaction product and optionally milling the calcined product, an unstabilized or stabilized zirconium dioxide powder having good properties can be prepared. The process avoids the use of aqueous solutions and the isolation of precipitates which con- stitute major disadvantages of known processes. The zirconium dioxide powder so produced is highly homogenous and suitable for the production of sintered articles which can be subjected to high mechanical and/or thermal stresses.

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