RARE EARTH SINTERED MAGNET

• Main Authors: SAKAKI KAZUAKI, KUME TETSUYA
• Format: Patent
• Language: English; Japanese
• Published: 10.06.2021
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; INDUCTANCES; MAGNETS; METALLURGY; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

SOLUTION: There is provided a rare earth sintered magnet comprising R (R is one or more elements selected from rare earth elements, invariably including Nd), T (T is one or more elements from iron group elements, invariably including Fe ), X (X is one or two elements selected from B and C, invariably including B), M1 (M1 is one or more elements selected from Al, Si, Cr, Mn, Cu, Zn, Ga, Ge, Mo, Sn, W, Pb and Bi), O of 0.1 mass% or less, N of 0.05 mass% or less, and C of 0.07 mass% or less, wherein the rare earth sintered magnet has an average crystal grain diameter of 4.0 μm or less, and a following relational expression (1) is satisfied: 0.26×D+97≤Or≤0.26×D+99 (1), where its orientation degree is Or[%] and the average crystal grain diameter is D[μm].EFFECT: With a rare earth sintered magnet of the present invention, such superior magnetic characteristics that high Br and high HcJ are both achieved can be obtained.SELECTED DRAWING: None 【解決手段】Ｒ（Ｒは希土類元素から選ばれる１種以上の元素であり、Ｎｄを必須とする。）、Ｔ（Ｔは鉄族元素から選ばれる１種以上で、Ｆｅは必須）、Ｘ（ＸはＢ、Ｃから選ばれる１種又は２種で、Ｂは必須）、Ｍ1（Ｍ1はＡｌ、Ｓｉ、Ｃｒ、Ｍｎ、Ｃｕ、Ｚｎ、Ｇａ、Ｇｅ、Ｍｏ、Ｓｎ、Ｗ、Ｐｂ、Ｂｉから選ばれる１種以上）、０．１質量％以下のＯ、０．０５質量％以下のＮ、０．０７質量％以下のＣを含み、平均結晶粒径が４．０μｍ以下であり、かつ配向度をＯｒ［％］、平均結晶粒径をＤ［μｍ］とした場合に、次の関係式（１）０．２６×Ｄ＋９７≦Ｏｒ≦０．２６×Ｄ＋９９ ・・・（１）を満たすことを特徴とする希土類焼結磁石を提供する。【効果】本発明の希土類焼結磁石によれば、高いＢｒと高いＨcJを両立した優れた磁気特性を得ることができる。【選択図】なし