| 发明名称 |
R-T-B BASED PERMANENT MAGNET AND RAW ALLOY FOR THE SAME |
| 摘要 |
In the present invention, a permanent magnet with excellent temperature properties and magnetic properties which will not significantly deteriorate can be stably prepared, by using a raw alloy for the R-T-B based permanent magnet in which the rare earth element(s) composed of at least one selected from the group consisting of Y, La and Ce is selected as a predetermined amount of the rare earth element R in the R-T-B based permanent magnet and a proper amount of Ca is contained. |
| 申请公布号 |
US2015302959(A1) |
申请公布日期 |
2015.10.22 |
| 申请号 |
US201514686200 |
申请日期 |
2015.04.14 |
| 申请人 |
TDK CORPORATION |
发明人 |
HASHIMOTO Ryuji;ENOKIDO Yasushi;WADA Hironori |
| 分类号 |
H01F1/057;C22C38/00 |
主分类号 |
H01F1/057 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. An R-T-B based permanent magnet comprising a main phase grains with a composition of (R11-xR2x)2T14B, and further comprising 15 ppm to 250 ppm of Ca in terms of weight ratio,
wherein R1 represents at least one rare earth element that does not include Y, La or Ce, R2 represents rare earth element(s) composed of at least one selected from the group consisting of Y, La and Ce, T represents at least one transition metal element containing Fe or the combination of Fe and Co as essential element(s), and 0.1≦x≦0.5. |
| 地址 |
Tokyo JP |
