A process for the production of very pure fine-grained superconducting powders

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The present invention refers to the industrial scale production of very pure superconducting powders RexBayCuzO7-δ (Re : Y or any rare earth element), through combination of the processes of spray drying and solid state reaction. The derived powders are used for the manufacturing of compact specimens or thermal sprayed coatings. The method consists of a) production of stable aqueous suspensions after wet milling of the mix that contains the raw materials, the distilled water and appropriate binders and dispersants, b) Spray drying of the slurry for the production of dry powder and c) calcination of dry powder for the formation of the desired superconducting phase. Under the optimized spray drying conditions, the use of slurries of metal oxides with very high solids content, leads to a process yield around 85-90% and extremely high productivity. The produced powders are of high purity and are used for the production of compact samples or the production of thermal sprayed coatings.