| 摘要 |
A rare earth magnet of the invention has a composition represented by the compositional formula RaHbFecCodBeMf, where:
R is at least one rare earth element including Y;H is at least one heavy rare earth element from among Dy and Tb;M is at least one element from among Ga, Zn, Si, Al, Nb, Zr, Ni, Cu, Cr, Hf, Mo, P, C, Mg, and V;13≦a≦20;0≦b≦4;c=100−a−b−d−e−f;0≦d≦30;4≦e≦20;0≦f≦3, and has a structure constituted by a main phase: a (RH)2(FeCo)14B phase, and a grain boundary phase: a (RH)(FeCo)4B4 phase and a RH phase, with a crystal grain size of the main phase of 10 nm to 200 nm. |
| 主权项 |
1. A rare earth magnet comprising:
a composition represented by the compositional formula RaHbFecCodBeMf, where: a, b, c, d, e and f are atomic percentages; R is at least one rare earth element including Y; H is at least one heavy rare earth element from among Dy and Tb; M is at least one element from among Ga, Zn, Si, Al, Nb, Zr, Ni, Cu, Cr, Hf, Mo,P, C, Mg, and V; 13≦a≦20; 0≦b≦4; c=100−a−b−d−e−f; 0≦d≦30; 4≦e≦20; 0≦f≦3, and including a structure constituted by a main phase: a (RH)2(FeCo)14B phase, and a grain boundary phase: a (RH)(FeCo)4B4 phase and a RH phase, with a crystal grain size of the main phase of 10 nm to 200 nm, wherein when a volume of the grain boundary phase to the earth magnet is within a range of from greater than 0% to less than 15%, a ratio of a volume the (RH)(FeCo)4B4 phase to a volume of the grain boundary phase is within a range of from greater than 0% to less than 50%, when the volume fraction of the grain boundary phase to the rare earth magnet is 15% to 23%, the ratio of the volume of the (RH)(FeCo)4B4 phase to the volume of the grain boundary phase is 15% to 80%, and when the volume fraction of the grain boundary phase to the rare earth magnet is more than 23%, the ratio of the volume of the (RH)(FeCo)4B4 phase to the volume of the grain boundary phase is 30% to 80%. |
