Process for making nano-sized stabilized zirconia

C - Chemistry – Metallurgy – 01 – G

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C01G 25/02 (2006.01) C04B 35/48 (2006.01)

Patent

CA 2465505

A process to produce stabilized zirconia from a solution of zirconium salt and a stabilizing agent. The zirconium salt may include zirconium oxysulfate, zirconium oxychloride, zirconium oxynitrate, zirconium nitrate, and other water-soluble zirconium salts. The stabilizing agent may include calcium, magnesium, yttrium salts of oxides and rare earth oxides. The process is conducted by evaporation of the solution above the boiling point of the solution but below the temperature where there is significant crystal growth. The evaporation step is followed by calcination to produce the desired nano- sized structure. Further processing by sintering may be applied to produce solid structures or by milling and classification to produce material for thermal spray coating.

L'invention concerne un procédé de production de zircone stabilisée à partir d'une solution de sel de zirconium et d'un agent de stabilisation. Le sel de zirconium peut comprendre de l'oxysulfate de zirconium, de l'oxychlorure de zirconium, de l'oxynitrate de zirconium, du nitrate de zirconium, et d'autres sels de zirconium solubles dans l'eau. L'agent de stabilisation peut comprendre des sels de calcium, de magnésium et d'yttrium d'oxydes et d'oxydes des terres rares. Le procédé est mis en oeuvre par évaporation de la solution au-dessus du point d'ébullition de la solution mais en dessous de la température à laquelle se produit une croissance cristalline significative. L'étape d'évaporation est suivie d'une étape de calcination afin d'obtenir la structure de dimension nanométrique désirée. Un traitement supplémentaire par frittage peut être appliqué afin d'obtenir des structures solides, ou par broyage et classification pour obtenir un matériau de revêtement par pulvérisation thermique.

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