Zirconia sol and process of making same

Details Zirconia sol and process of making same Zirconia sol and process of making same

C - Chemistry, Metallurgy

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C01G 25/02 (2006.01) B01J 13/00 (2006.01) C08K 3/00 (2006.01) C08K 3/22 (2006.01) C08K 7/00 (2006.01) C08K 7/18 (2006.01) C08K 9/04 (2006.01)

Patent

CA 2388876

A zirconia sol comprising an aqueous phase having dispersed therein a plurality of single crystal zirconia particles having an average primary particle size less than about 20 nm. The zirconia sols are substantially non associated having a dispersion index ranging from about 1-3 and are highly crystalline exhibiting a crystallinity index of about 0.65 or greater. Of the crystalline phase, about 70% or greater exists in combined cubic and tetragonal crystal lattice structures without a crystal phase stabilizer. Also described is a hydrothermal method of making zirconia sols having substantially non-associated zirconia particles and composite materials made from the zirconia sols.

Sol de zircone comprenant une phase aqueuse dans laquelle est dispersée une pluralité de particules de monocristaux de zircone présentant une granulométrie primaire moyenne inférieure à environ 20nm. Les sols de zircone ne sont sensiblement pas associés et présentent un indice de dispersion compris entre 1 et 3 et sont d'une cristallinité élevée, avec un indice de cristallinité égal ou supérieur à 0,65. De la phase cristalline, environ 70 % ou plus se présente sous la forme de structures en réseau cristallin cubique ou quadratique sans élément stabilisant de la phase cristalline. L'invention concerne également un procédé hydrothermique de fabrication de sols de zircone présentant des particules de zircone sensiblement non associées et des matériaux composites élaborés à partir des sols de zircone.

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