RARE EARTH-COBALT PERMANENT MAGNET

摘要

There is provided a rare earth-cobalt permanent magnet containing 23 to 27 wt % R, 3.5 to 5 wt % Cu, 19 to 25 wt % Fe, 1.5 to 3 wt % Zr, and a remainder Co with inevitable impurities, where an element R is a rare earth element at least containing Sm. The rare earth-cobalt permanent magnet has a density of 8.15 to 8.39 g/cm3. It also has a metal structure including a cell phase (11) containing Sm2Co17 phase and a cell wall (12) surrounding the cell phase and containing SmCo5 phase. An average crystal grain diameter is within a range of 40 to 100 μm. A half width of Cu content of the cell wall (12) is 10 nm or less.

主权项

1. A rare earth-cobalt permanent magnet containing 23 to 27 wt % R, 3.5 to 5 wt % Cu, 19 to 25 wt % Fe, 1.5 to 3 wt % Zr, and a remainder Co with inevitable impurities, where an element R is a rare earth element at least containing Sm, wherein
the rare earth-cobalt permanent magnet has a density of 8.15 to 8.39 g/cm3, the rare earth-cobalt permanent magnet has a metal structure including a cell phase containing Sm2Co17 phase and a cell wall surrounding the cell phase and containing SmCo5 phase, an average crystal grain diameter is within a range of 40 to 100 μm, and a half width of Cu content of the cell wall is 10 nm or less.