PROTECTIVE COATING MATERIAL FOR ANNEALING FOR ANISOTROPIC SILICON STEEL PLATE

PURPOSE:To obtain a protective coating material for annealing capable of improving the magnetic characteristics of an anisotropic silicon steel plate by adding a small amount of fine metallic powder of Al, Si, Ti, Cr, Zr or the like to magnesium oxide. CONSTITUTION:A protective coating material for...

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Bibliographische Detailangaben
Hauptverfasser:	TANAKA OSAMU, HIROMAE YOSHITAKA
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING BRAKES CHEMICAL SURFACE TREATMENT CHEMISTRY CLUTCHES 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 COUPLINGS FOR TRANSMITTING ROTATION DIFFUSION TREATMENT OF METALLIC MATERIAL ENGINEERING ELEMENTS AND UNITS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL ENGINEERING METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain a protective coating material for annealing capable of improving the magnetic characteristics of an anisotropic silicon steel plate by adding a small amount of fine metallic powder of Al, Si, Ti, Cr, Zr or the like to magnesium oxide. CONSTITUTION:A protective coating material for annealing for an anisotropic silicon steel plate is obtd. by adding 0.1-10wt% fine metallic powder of >=1 kind among Al, Si, Ti, Cr, Zr, Nb, Sn, W and Mo to magnesium oxide. A slurry of the coating material is applied to a silicon steel plate after decarburization annealing and dried to remote the water. The steel plate is annealed at high temp. in a gaseous mixture of H2 with N2 to cause secondary recrystallization, and impurities in the steel is removed in an H2 atmosphere to obtain an anisotropic silicon steel plate. The oxidation of the steel plate during the annealing at high temp. is inhibited by using the protective coating material for annealing, so an anisotropic silicon steel plate with stable magnetic characteristics can be manufactured.