| 发明名称 |
R-T-B BASED PERMANENT MAGNET |
| 摘要 |
A R-T-B based permanent magnet which not only has equivalent magnetic properties as the existing Nd—Fe—B based permanent magnet but also has a high adhesive strength and which can be suitably used as a magnet for field system of a permanent magnet synchronous rotating machine. The magnet can be obtained in a case where the composition of the compound for forming the main phase is (R1-x(Ce1-zYz)x)2T14B (R is rare earth element(s) consisting of one or more elements selected from La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, T is one or more transition metal elements with Fe or Fe and Co as essential element(s), 0.0<x≦0.5 and 0.0≦z≦0.5), by making the abundance ratio of Ce4f/(Ce4f+Ce4g) satisfies 0.8≦Ce4f/(Ce4f+Ce4g)≦1.0 when the Ce occupying the 4f site of the tetragonal R2T14B structure is denoted Ce4f and the Ce occupying the 4g site is denoted as Ce4g. |
| 申请公布号 |
US2015132178(A1) |
申请公布日期 |
2015.05.14 |
| 申请号 |
US201414385921 |
申请日期 |
2014.02.12 |
| 申请人 |
TDK CORPORATION |
发明人 |
Suzuki Kenichi;Choi Kyung-Ku;Hashimoto Ryuji |
| 分类号 |
H01F1/057;C22C38/00 |
主分类号 |
H01F1/057 |
| 代理机构 |
|
代理人 |
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| 主权项 |
1. A R-T-B based permanent magnet, comprising main phase grains with a composition of (R1-x(Ce1-zYz)x)2T14B, wherein the abundance ratio of Ce4f/(Ce4f+Ce4g) satisfies 0.8≦Ce4f/(Ce4f+Ce4g)≦1.0 when the Ce occupying the 4f site of the tetragonal R2T14B structure in the main phase grains is denoted as Ce4f and the Ce occupying the 4g site is denoted as Ce4g,
wherein R is rare earth element(s) consisting of one or more elements selected from La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, T is one or more transition metal elements with Fe or Fe and Co as essential elements, 0.0<x≦0.5 and 0.0≦z≦0.5. |
| 地址 |
Tokyo JP |
