| 发明名称 |
R-T-B BASED SINTERED MAGNET |
| 摘要 |
The present invention provides a permanent magnet with both a high corrosion resistance and magnetic properties compared to the existing R-T-B based magnets. It is a R-T-B based sintered magnet (wherein, R includes Y (yttrium) and R1 as essential, R1 is at least one kind of rare earth elements except Y but includes Nd as essential, and T is at least one kind of transition metal element including Fe or the combination of Fe and Co as essential). By allowing the ratio of R1 to Y (R1:Y) in the R contained in the grain boundary phase to be 80:20˜35:65 in terms of the calculated molar ratio of the grain boundary phase and adding Y to the raw materials of the R-T-B based magnet, Y segregates at the triple point, and corrosion of grain boundary phase is prevented by oxidized Y. |
| 申请公布号 |
US2014311288(A1) |
申请公布日期 |
2014.10.23 |
| 申请号 |
US201414258375 |
申请日期 |
2014.04.22 |
| 申请人 |
TDK CORPORATION |
发明人 |
ENOKIDO Yasushi;OHSAWA Akihiro |
| 分类号 |
H01F1/053 |
主分类号 |
H01F1/053 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A R-T-B based sintered magnet, wherein,
R contains Y and R1 as essential, Y is yttrium, R1 is at least one kind of rare earth element except Y but contains Nd as essential, and T represents at least one kind of transition metal element containing Fe or the combination of Fe and Co as essential, the ratio of R1 to Y (R1:Y) in the R contained in the grain boundary phase is 80:20 to 35:65 in terms of the calculated molar ratio of the grain boundary phase. |
| 地址 |
Tokyo JP |
