Nanostructured composite metal oxide material, production method and use
AssigneeConsejo Superior de Investigaciones Cientificas
InventorsLuís Antonio Díaz Rodríguez, Ramón Torrecillas San Millan, Adolfo Fernández Valdés, Marta Suarez Menéndez, Martin Rudolf Schehl
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Abstract
The present invention relates to an alumina-zirconia nanostructured composite material characterised in that the content of elements other than Al, Zr, Hf, Y, Ce and O is less than 100 ppm, the Cl content is less than 1 ppm, at least one of the components has a mean grain size in the final material smaller than 500 nm, and at least 1/10 of the particles are in the intragranular position. Another object of the invention is the process for obtaining said material, as well as the use thereof.
Claims20
Alumina-zirconia nanostructured composite material characterised in that the content of elements other than Al, Zr, Hf, Y, Ce and O is less than 100 ppm, the Cl content is less than 1 ppm, at least one of the components has a mean grain size in the final material smaller than 500 nm, and at least 110 of the particles are in the intragranular position.
Process for obtaining an alumina-zirconia nanostructured composite material wherein said process is characterised in that it comprises the following steps:
- a) mixing at least one aqueous suspension composed of a ceramic oxide powder and a metal carbonate;
- b) adjusting the pH of the mixture prepared in step (a);
- c) drying the suspension obtained in step (b), to obtain a dry powder;
- d) shaping the powder obtained in step (c);
- and
- e) sintering the shaped powder obtained in step (d).
Dependencies are inferred from the claim text.