Nanocrystaline spherical ceramic oxides, process for the synthesis and use thereof
AssigneeCuf-Companhia Uniao Fabril, Sgps, S.A.
InventorsJoão Manuel Calado Da Silva, Elsa Marisa Dos Santos Antunes
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Abstract
The present invention refers to nanocrystalline spherical ceramic oxides, to the process for the synthesis and use thereof. These oxides, obtained by detonation of a water-in-oil emulsion (W/O), besides having a spherical morphology and nanocrystallinity, show a set of complementary features, namely a particle dimension inferior to 40 μm, bimodal particle size distribution, high purity, deagglomeration and stable crystalline stages. This set of features makes these powders particularly suitable for several applications such as coating processes, near net shape processes and, when applied in ceramics industry, they provide dense and porous ceramic objects of exceptionally high mechanical resistance.
Claims6
A process for the synthesis of nanocrystalline spherical ceramic oxide powder comprising detonating a water-in-oil emulsion comprising oxidant and fuel phases and metals, at a temperature in a C, J (Chapman, Jouguet) point that is higher than the ceramic oxide melting point.
Dependencies are inferred from the claim text.