发明名称 |
R-T-B rare earth sintered magnet, alloy for R-T-B rare earth sintered magnet, and method of manufacturing the same |
摘要 |
An R-T-B rare earth sintered magnet contains R which represents a rare earth element; T which represents a transition metal essentially containing Fe; a metal element M which represents Al and/or Ga; B; Cu; and inevitable impurities the R-T-B rare earth sintered magnet including 13.4 to 17 at% of R, 4.5 to 5.5 at% of B, and 0.1 to 2.0 at% of M, and T as the balance; in which the R-T-B rare earth sintered magnet is formed of a sintered body which includes a main phase composed of R 2 Fe 14 B and a grain boundary phase including a larger amount of R than the main phase; in which the magnetization direction of the main phase is a c-axis direction, in which crystal grains of the main phase have one of an elliptical shape and an oval shape extended in such a direction so as to cross the c-axis direction; and in which the grain boundary phase includes an R-rich phase in which the total atomic concentration of the rare earth elements is 70 at% or greater and a transition metal-rich phase in which the total atomic concentration of the rare earth elements is 25 to 35 at%. |
申请公布号 |
EP2752857(A2) |
申请公布日期 |
2014.07.09 |
申请号 |
EP20130006066 |
申请日期 |
2013.12.30 |
申请人 |
SHOWA DENKO K.K. |
发明人 |
YAMAZAKI, TAKASHI;NAKAJIMA, KENICHIRO |
分类号 |
H01F1/057 |
主分类号 |
H01F1/057 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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