R-T-B BASED PERMANENT MAGNET

• Main Authors: NAKANE MAKOTO, DOTO HIROSHI, MASUZAWA KIYOYUKI
• Format: Patent
• Language: Chinese; English
• Published: 25.06.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; INDUCTANCES; MAGNETS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS

An A R-T-B based permanent magnet, wherein R is a rare earth element, T is Fe and Co, and B is boron. R at least includes Dy and Tb. The R-T-B based permanent magnet includes M, and M is one or more elements selected from the group made of Cu, Ga, Al, Mn, Zr, Ti, Cr, Ni, Nb, Ag, Hf, Ta, W, Si, Bi, and Sn. M at least includes Cu. A total content of R is 28.05 mass % to 30.60 mass %, a content of Dyis 1.0 mass % to 6.5 mass %, a content of Cu is 0.04 mass % to 0.50 mass %, a content of Co is 0.5 mass % to 3.0 mass %, and a content of B is 0.85 mass % to 0.95 mass %. A concentration distributionof Tb decreases from an outer side towards an inner side of the R-T-B based permanent magnet. 本发明提供一种R-T-B系永久磁铁，R为稀土元素，T为Fe及Co，B为硼。作为R，至少含有Dy以及Tb。含有M，M为选自Cu、Ga、Al、Mn、Zr、Ti、Cr、Ni、Nb、Ag、Hf、Ta、W、Si、Bi、Sn中的1种以上的元素。作为M，至少含有Cu。R的合计含量为28.05质量％～30.60质量％、Dy的含量为1.0质量％～6.5质量％、Cu的含量为0.04质量％～0.50质量％、Co的含量为0.5质量％～3.0质量％、B的含量为0.85质量％～0.95质量％。Tb的浓度分布为从所述R-T-B系永久磁铁的外侧朝向内侧降低的浓度分布。