ANISOTROPIC RARE EARTH SINTERED MAGNET AND MANUFACTURING METHOD THEREFOR

• Main Authors: OTSUKA KAZUKI, NOMURA TADAO, KAMADA MASAYUKI
• Format: Patent
• Language: English; Japanese
• Published: 30.11.2022
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CASTING; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INDUCTANCES; MAGNETS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; POWDER METALLURGY; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING METALLIC POWDER

To provide an anisotropic rare earth sintered magnet and a manufacturing method therefor, the anisotropic rare earth sintered magnet including a main phase of a ThMn12 type crystal compound and showing an excellent magnetic characteristic.SOLUTION: An anisotropic rare earth sintered magnet has a constitution represented by (R1-aZra)v(Fe1-bCob)100-v-w-x-y(M11-cM2c)wOxCy, where R is one or more types of rare earth elements and contains Sm as an essential element, M1 is one or more types of elements from V, Cr, Mn, Ni, Cu, Zn, Ga, Al, and Si, M2 is one or more types of elements from Ti, Nb, Mo, Hf, Ta, and W, and v, w, x, y, a, b, and c satisfy 7≤v≤15 atom%, 4≤w≤20 atom%, 0.2≤x≤4 atom%, 0.2≤y≤2 atom%, 0≤a≤0.2, 0≤b≤0.5, and 0≤c≤0.9, respectively. The anisotropic rare earth sintered magnet contains 80 vol.% or more of a ThMn12 type crystal's main phase having the average crystal grain diameter equal to or larger than 1 μm, has a grain boundary part in which 1 vol.% or more oxycarbide of R exists, and has density equal to or higher than 7.3 g/cm3.SELECTED DRAWING: None 【課題】ＴｈＭｎ１２型結晶の化合物を主相とする異方性希土類焼結磁石において、良好な磁気特性を示す異方性希土類焼結磁石およびその製造方法を提供する。【解決手段】異方性希土類焼結磁石は、組成が（Ｒ１－ａＺｒａ）ｖ（Ｆｅ１－ｂＣｏｂ）１００－ｖ－ｗ－ｘ－ｙ（Ｍ１１－ｃＭ２ｃ）ｗＯｘＣｙ（Ｒは希土類元素から１種以上でＳｍを必須とし、Ｍ１はＶ、Ｃｒ、Ｍｎ、Ｎｉ、Ｃｕ、Ｚｎ、Ｇａ、Ａｌ、Ｓｉから１種以上の元素、Ｍ２はＴｉ、Ｎｂ、Ｍｏ、Ｈｆ、Ｔａ、Ｗから１種以上の元素、ｖ、ｗ、ｘ、ｙ、ａ、ｂ、ｃは各々、７≦ｖ≦１５原子％、４≦ｗ≦２０原子％、０．２≦ｘ≦４原子％、０．２≦ｙ≦２原子％、０≦ａ≦０．２、０≦ｂ≦０．５、０≦ｃ≦０．９）で表され、ＴｈＭｎ１２型結晶の主相を８０体積％以上含み、主相の平均結晶粒径が１μｍ以上、粒界部にＲのオキシカーバイドが１体積％以上存在、密度が７．３ｇ／ｃｍ３以上である。【選択図】なし