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公开(公告)号：US20230343496A1
公开(公告)日：2023-10-26
申请号：US17906999
申请日：2021-03-18
发明人： Tadao NOMURA , Kazuki OTSUKA , Masayuki KAMATA
IPC分类号： H01F1/055 , H01F41/02 , B22F3/16 , B22F9/04 , B22F3/24 , C22C38/00 , C22C38/12 , C22C38/06 , C22C38/02 , C22C38/14 , C22C38/10 , C22C38/30 , C22C38/26 , C22C38/08 , C22C38/20 , C22C38/22 , C22C38/34
CPC分类号： H01F1/0557 , H01F41/0266 , B22F3/16 , B22F9/04 , B22F3/24 , C22C38/005 , C22C38/12 , C22C38/06 , C22C38/02 , C22C38/14 , C22C38/10 , C22C38/30 , C22C38/26 , C22C38/08 , C22C38/20 , C22C38/22 , C22C38/34 , B22F2998/10 , B22F2202/05 , B22F2003/248 , B22F2301/355 , B22F2999/00
摘要： An anisotropic rare earth sintered magnet represented by the formula (R1-aZra)x(Fe1-bCOb)100-x-y(M11-cM2c)y. R is Sm and at least one element selected from rare earth elements, M1 is at least one element selected from the group consisting of V, Cr, Mn, Ni, Cu, Zn, Ga, Al, and Si, M2 is at least one element selected from the group consisting of Ti, Nb, Mo, Hf, Ta, and W, and x, y, a, b, and c each satisfy 7≤x≤15 at %, 4≤y≤20 at %, 0≤a≤0.2, 0≤b≤0.5, and 0≤c≤0.9. The magnet includes 80% by volume or more of a main phase composed of a compound of a ThMn12 type crystal, the main phase having an average crystal grain size of 1 μm or more, and an intergranular grain boundary phase being formed between adjacent main phase grains.
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公开(公告)号：US20230148121A1
公开(公告)日：2023-05-11
申请号：US18050748
申请日：2022-10-28
发明人： Tadao NOMURA , Masayuki KAMATA
IPC分类号： H01F1/057
CPC分类号： H01F1/0577
摘要： The invention provides an anisotropic rare earth sintered magnet having an Nd2Fe14B-type compound crystal as a main phase and containing Ce, and exhibiting good magnetic characteristics, and a method for producing the same. The anisotropic rare earth sintered magnet has a composition of a formula Rx(Fe1−aCoa)100−x−y−zByMz (where R is two or more kinds of elements selected from rare earth elements and indispensably including Nd and Ce), in which the main phase is formed of an Nd2Fe14B-type compound crystal, main phase grains such that the Ce/R′ ratio in the center part of the grains (where R′ is one or more kinds of elements selected from rare earth elements and indispensably including Nd) is lower than the Ce/R′ ratio in the outer shell part thereof exist, and a Ce-containing R′-rich phase and a Ce-containing R′(Fe,Co)2 phase exist in the grain boundary part. The production method is for producing the anisotropic rare earth sintered magnet.
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公开(公告)号：US20230144451A1
公开(公告)日：2023-05-11
申请号：US17906446
申请日：2021-03-18
发明人： Tadao NOMURA , Kazuki OTSUKA , Masayuki KAMATA
CPC分类号： H01F1/0593 , B22F3/12 , B22F3/24 , H01F41/0293 , H01F41/0266 , C22C38/10 , C22C2202/02
摘要： An anisotropic rare earth sintered magnet represented by the formula (R1-aZra)x(Fe1-b COb)100-x-y(M11-cM2c)y where R is at least one element selected from rare earth elements and Sm is essential; M1 is at least one of V, Cr, Mn, Ni, Cu, Zn, Ga, Al, and Si; M2 is at least one of Ti, Nb, Mo, Hf, Ta, and W; and x, y, a, b, and c each satisfy certain conditions. The anisotropic rare earth sintered magnet includes 80% by volume or more of a main phase composed of a compound of a ThMn12 type crystal, the main phase having an average crystal grain size of 1 μm or more, and containing an R-rich phase and an R(Fe,Co)2 phase in a grain boundary portion. A method for producing the anisotropic rare earth sintered magnet is also described.
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公开(公告)号：US20220367092A1
公开(公告)日：2022-11-17
申请号：US17733191
申请日：2022-04-29
发明人： Tadao NOMURA , Kazuki OTSUKA , Masayuki KAMATA
IPC分类号： H01F1/10 , C01B32/907
摘要： Provided are an anisotropic rare earth sintered magnet having a ThMn12-type crystal compound as a main phase and exhibits good magnetic characteristics, and a method for producing it. The anisotropic rare earth sintered magnet has a composition of a formula (R1-aZra)v(Fe1-bCob)100-v-w-x-y(M11-cM2c)wOxCy (where R is one or more kinds selected from rare earth elements and indispensably includes Sm, M1 is one or more kinds of elements selected from the group consisting of V, Cr, Mn, Ni, Cu, Zn, Ga, Al, and Si, M2 is one or more kinds of elements selected from the group consisting of Ti, Nb, Mo, Hf, Ta, and W, and v, w, x, y, a, b, and c each satisfy 7≤v≤15 at %, 4≤w≤20 at %, 0.2≤x≤4 at %, 0.2≤y≤2 at %, 0≤a≤0.2, 0≤b≤0.5, and 0≤c≤0.9), which contains a main phase of a ThMn12-type crystal compound in an amount of 80% by volume or more with the average crystal particle diameter of the main phase being 1 μm or more, which contains an R oxycarbide in the grain boundary area, and which has a density of 7.3 g/cm3 or more. The production method for the anisotropic rare earth sintered magnet includes grinding an alloy that contains a ThMn12-type crystal compound phase but does not contain an oxycarbide, then molding it in a mode of pressure powder molding with magnetic field application thereto to give a molded article, and thereafter sintering it at a temperature of 800° C. or higher and 1400° C. or lower to form an oxycarbide in the grain boundary area.
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