MAGNESIUM OXIDE FOR ANNEALING SEPARATORS, AND GRAIN-ORIENTED MAGNETIC STEEL SHEET

• Main Authors: KAMEI Tadasuke, MIGITA Tsubasa, HIRATSU Yutaka
• Format: Patent
• Language: English; French; Japanese
• Published: 05.10.2017
• Subjects: BASIC ELECTRIC ELEMENTS; 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; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELECTRICITY; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INDUCTANCES; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; INORGANIC CHEMISTRY; MAGNETS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSFORMERS

The present invention addresses the problem of providing a magnesium oxide for annealing separators for obtaining a grain-oriented magnetic steel sheet having excellent magnetic properties and insulation properties. The present invention for solving this problem is a magnesium oxide for annealing separators, in which the sulfur content is 0.1 to 0.5 mass% and the aggregation degree RBlaine/RBET, which is the ratio of the particle diameter RBlaine calculated from the Blaine specific surface area to the particle diameter RBET calculated from the BET specific surface area, is 3.0 to 5.5. La présente invention a pour objet un oxyde de magnésium pour des séparateurs de recuit permettant d'obtenir une tôle d'acier magnétique à grains orientés ayant d'excellentes propriétés magnétiques et propriétés d'isolation. À cet effet, la présente invention porte sur un oxyde de magnésium pour des séparateurs de recuit, dans lequel la teneur en soufre est de 0,1 à 0,5 % en masse et le degré d'agrégation RBlaine/RBET, qui est le rapport du diamètre des particules RBlaine calculé à partir de la surface spécifique Blaine au diamètre des particules RBET calculé à partir de la surface spécifique BET, est de 3,0 à 5,5. 本発明は、磁気特性及び絶縁特性に優れた方向性電磁鋼板を得るための焼鈍分離剤用酸化マグネシウムを提供することを課題とする。上記課題を解決するための本発明は、硫黄含有量が０．１～０．５質量％、及びブレーン比表面積から算出される粒子径ＲＢｌａｉｎｅのＢＥＴ比表面積から算出される粒子径ＲＢＥＴに対する比である凝集度ＲＢｌａｉｎｅ／ＲＢＥＴが３．０～５．５である焼鈍分離剤用酸化マグネシウムである。