RARE EARTH SINTERED MAGNET

• Main Authors: OHASHI TETSUYA, HIROTA KOICHI, KUME TETSUYA
• Format: Patent
• Language: English; Japanese
• Published: 24.06.2021
• 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 which includes R (R represents one or more of rare earth elements, and Nd is essential), T (T represents one or more elements of iron group elements, and Fe is essential), B, M1 (M1 is one or more elements selected from among Al, Si, Cr, Mn, Cu, Zn, Ga, Ge, Mo, Sn, W, Pb and Bi) and M2 (M2 is one or more elements selected from among Ti, V, Zr, Nb, Hf and Ta), and which has a R2T14B phase as a main phase. The M1 is 0.5-2 atom%; when the atomic percentages of the R, T, M2, and B are [R], [T], [M2] and [B], respectively, the following relational expression (1) is satisfied, ([T]/14)+[M2]≤[B]≤([R]/2)+([M2]/2)...(1); and 0.1-10 vol.% of the whole grain boundary phase in a magnet is a R6T13M1 phase.EFFECT: A rare earth sintered magnet of the present invention can provide excellent magnetic characteristics achieving both high Br and high HcJ.SELECTED DRAWING: None 【解決手段】Ｒ（Ｒは希土類元素の１種以上で、Ｎｄは必須）、Ｔ（Ｔは鉄族元素の１種以上の元素で、Ｆｅは必須）、Ｂ、Ｍ1（Ｍ1はＡｌ、Ｓｉ、Ｃｒ、Ｍｎ、Ｃｕ、Ｚｎ、Ｇａ、Ｇｅ、Ｍｏ、Ｓｎ、Ｗ、Ｐｂ、Ｂｉから選ばれる１種以上の元素）、及びＭ2（Ｍ2はＴｉ、Ｖ、Ｚｒ、Ｎｂ、Ｈｆ、Ｔａから選ばれる１種以上の元素）を含み、Ｒ2Ｔ14Ｂ相を主相とする希土類焼結磁石であって、上記Ｍ1が０．５〜２原子％、上記Ｒ、Ｔ、Ｍ2、Ｂの原子百分率をそれぞれ［Ｒ］、［Ｔ］、［Ｍ2］、［Ｂ］とした場合に、下記の関係式（１）を満足し、（［Ｔ］／１４）＋［Ｍ2］≦［Ｂ］≦（［Ｒ］／２）＋（［Ｍ2］／２）・・・（１）かつ磁石中の全粒界相の０．１〜１０体積％が、Ｒ6Ｔ13Ｍ1相である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