Production of coated inorganic magnetic particles

Details Production of coated inorganic magnetic particles Production of coated inorganic magnetic particles

H - Electricity

01

F

31/121, 117/47.4

H01F 1/36 (2006.01) B03C 1/01 (2006.01) G01N 33/543 (2006.01) H01F 1/44 (2006.01)

Patent

CA 1340151

A process for producing solid ceramic particles completely coated with a coating metal oxide different from metal oxides in the ceramic are disclosed. The coated ceramic particles have a diameter less than approximately 5 microns. The process for preparing such particles comprises: i) forming an emulsion of an aqueous solution of salts of metal ions of the ceramic in a non-miscible liquid to provide aqueous particles; ii) reacting the emulsion with NH3(g) to precipitate the ceramic particles; iii) separating out from the reaction mixture the precipitate. In the course of this process, the ceramic particles are coated by: iv) a) introducing a colloid of fine particles of precursors of the coating metal oxide at a selected point in the process steps i) and iii), the selection being such to produce coated particles of a desired size and shape, or b) introducing a solution of the coating metal oxide precursors followed by a reaction with NH3(g) to precipitate the coating material onto the surface of the ceramic particles formed in step ii).

569920

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