Nanocrystaline spherical ceramic oxides, process for the synthesis and use thereof

Abstract

The present invention refers to nanocrystaline 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.

1 - 9 . (canceled) 
     
     
         10 . Powder nanocrystaline spherical ceramic oxides, comprising:
 a) bimodal particle size distribution;   b) 99.5% purity;   c) deagglomerated particles;   d) stable crystalline stages; and   e) particle dimension inferior to 40 μm;   wherein the powder nanocrystaline spherical ceramic oxides are obtained by a process comprising detonating a water-in-oil emulsion (W/O) comprising metals, at temperatures in the point C, J (Chapman, Jouguet) higher than the oxide melting point, through control of the emulsion composition.   
     
     
         11 . Use of the nanocrystaline spherical ceramic oxides according to  claim 10 , wherein the nanocrystaline spherical ceramic oxides are applied in near net shape processes, preferably injection moulding, slip casting and coating. 
     
     
         12 . Use of the nanocrystaline spherical ceramic oxides according to  claim 11 , wherein the use is aimed for application in ceramic objects or as reinforcement matrixes.