METHOD OF APPLYING A CORROSION-RESISTANT COATING

A corrosion resistant coating, e.g. a zinc coating, is applied to an article, e.g. an Nd-Fe-B magnet, by embedding the article in a mass of particles containing a sublimable corrosion-resistant material or a precursor thereof, and heating the embedded article at a temperature below the solidus tempe...

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Bibliographische Detailangaben
Hauptverfasser:	HARRIS, IVOR REX, SPEIGHT, JOHN D
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	BASIC ELECTRIC ELEMENTS CASTING CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTRICITY INDUCTANCES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MAGNETS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METALLURGY PERFORMING OPERATIONS POWDER METALLURGY SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSFORMERS TRANSPORTING WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	A corrosion resistant coating, e.g. a zinc coating, is applied to an article, e.g. an Nd-Fe-B magnet, by embedding the article in a mass of particles containing a sublimable corrosion-resistant material or a precursor thereof, and heating the embedded article at a temperature below the solidus temperature of the corrosion-resistant material under a pressure of less than 65 Pa so as to cause a coherent layer of the corrosion-resistant material to be formed on the article by sublimation. Also disclosed is a method of coating a powder, such as Nd-Fe-B powder, with a layer, in which the powder is mixed with particles of a sublimable material, e.g. zinc, or a precursor thereof. The resultant mixture is heated at a temperature below the solidus temperature of the said particles under a pressure of less than 1 x 10 5 Pa so as to cause a coherent layer of the sublimable material to be foamed on the powder by sublimation.