发明名称 |
PERMANENT MAGNET, AND MOTOR AND GENERATOR USING THE SAME |
摘要 |
In one embodiment, a permanent magnet includes a sintered compact having a composition represented by the composition formula: RpFeqMrCusCo100-p-q-r-s (where R is at least one element selected from rare earth elements, M is at least one element selected from Zr, Ti, and Hf, p is 10.5 atomic % or more and 12.5 atomic % or less, q is 24 atomic % or more and 40 atomic % or less, r is 0.88 atomic % or more and 4.5 atomic % or less, and s is 3.5 atomic % or more and 10.7 atomic % or less. The sintered compact has a structure having crystal grains constituted of a main phase including a Th2Zn17 crystal phase, and a crystal grain boundary. In the structure of the sintered compact, an average grain diameter of the crystal grains is 25 micrometer or more, and a volume fraction of the crystal grain boundary is 14% or less. |
申请公布号 |
US2015143952(A1) |
申请公布日期 |
2015.05.28 |
申请号 |
US201514611434 |
申请日期 |
2015.02.02 |
申请人 |
KABUSHIKI KAISHA TOSHIBA |
发明人 |
Horiuchi Yosuke;Sakurada Shinya;Okamoto Keiko;Hagiwara Masaya;Kobayashi Tsuyoshi;Endo Masaki;Kobayashi Tadahiko;Yoshima Kazuomi |
分类号 |
H01F1/055 |
主分类号 |
H01F1/055 |
代理机构 |
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代理人 |
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主权项 |
1. A permanent magnet comprising a sintered compact, the sintered compact comprising:
a composition represented by the following composition formula:
RpFeqMrCusCo100-p-q-r-s wherein R is at least one element selected from the group consisting of rare earth elements, M is at least one element selected from the group consisting of Zr, Ti, and Hf, p is 10.5 atomic % or more and 12.5 atomic % or less, q is 24 atomic % or more and 40 atomic % or less, r is 0.88 atomic % or more and 4.5 atomic % or less, and s is 3.5 atomic % or more and 10.7 atomic % or less; and a structure having crystal grains constituted of a main phase including a Th2Zn17 crystal phase, and a crystal grain boundary existing between the crystal grains, wherein an average grain diameter of the crystal grains is 25 micrometer or more, and a volume fraction of the crystal grain boundary is 14% or less. |
地址 |
Tokyo JP |