MAGNESIUM OXIDE FOR ANNEALING SEPARATING AGENT, AND GRAIN-ORIENTED ELECTRICAL STEEL SHEET

• Main Authors: SHIBATA Yuuki, TSUTSUMI Keisuke
• Format: Patent
• Language: English; French; Japanese
• Published: 05.10.2023
• Subjects: 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; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; 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

The purpose of the present invention is to provide a magnesium oxide which is for an annealing separating agent and which is used for obtaining a grain-oriented electrical steel sheet having excellent coating characteristics.　The present invention is a magnesium oxide for an annealing separating agent, for which the BET specific surface area is 12.0 m2/g to 30.0 m2/g and, according to measurement of the pore size distribution by mercury intrusion, the modal pore diameter is at least 0.1 µm but less than 0.4 µm and the modal pore volume is at least 1.3 cm3/g. L'objectif de la présente invention est de fournir un oxyde de magnésium qui est destiné à un agent de séparation de recuit et qui est utilisé pour obtenir une tôle d'acier électrique à grains orientés ayant d'excellentes caractéristiques de revêtement.　La présente invention est un oxyde de magnésium pour un agent de séparation de recuit, pour lequel la surface spécifique BET est de 12,0 m2/g à 30,0 m2/g et, selon la mesure de la distribution de taille de pore par intrusion de mercure, le diamètre de pore modal est d'au moins 0,1 µm mais inférieur à 0,4 µm et le volume de pore modal est d'au moins 1,3 cm3/g. 本発明の目的は、被膜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の提供である。　本発明は、ＢＥＴ比表面積が１２．０ｍ２／ｇ以上３０．０ｍ２／ｇ以下であって、水銀圧入式細孔分布測定による細孔のモード径が０．１μｍ以上０．４μｍ未満であり、細孔のモード容積が１．３ｃｍ３／ｇ以上である、焼鈍分離剤用酸化マグネシウムである。