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 R-T-B based permanent magnet in which R is a rare earth element, T is Fe and Co, and B is boron. R at least includes Dy. The R-T-B based permanent magnet includes M, and M is at least one or more elements selected from the group consisting 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 28.0 mass % to 30.2 mass %, a content of Dy is 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 %. 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。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28.0质量％～30.2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％。