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RARE EARTH-COBALT PERMANENT MAGNET 发明申请

2023-02-01 1940 300K 0

专利信息

申请日期 2025-07-20 申请号 US14643875
公开(公告)号 US20150262740A1 公开(公告)日 2015-09-17
公开国别 US 申请人省市代码 全国
申请人 NEC TOKIN Corporation
简介 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.


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