| 摘要 |
A high-performance NdFeB permanent magnet including a nitride phase and a production method thereof are provided. A main phase of the NdFeB permanent magnet has a structure of R2T14B; a grain boundary phase is distributed around the main phase and contains N, F, Zr, Ga and Cu; a composite phase containing R1, Tb and N exists between the main phase and the grain boundary phase and includes a phase having a structure of (R1, Tb)2T14(B, N). R represents at least two rare earth elements, and includes Pr and Nd; T represents Fe, Mn, Al and Co; R1 represents at least one rare earth element, and includes at least one of Dy and Tb; the main phase contains Pr, Nd, Fe, Mn, Al, Co and B; and the grain boundary phase further contains at least one of Nb and Ti. Through placing partially B by N, a magnetic performance is increased. |
| 主权项 |
1. A high-performance NdFeB permanent magnet comprising a nitride phase, wherein:
an average grain size of the NdFeB permanent magnet is in a range of 3-6 pin; a main phase of the NdFeB permanent magnet has a structure of R2T14B, and a grain boundary phase is distributed around the main phase and contains N, F, Zr, Ga and Cu; a composite phase containing R1, Tb and N exists between the main phase and the grain boundary phase and comprises a phase having a structure of (R1, Tb)2T14(B, N); R represents at least two rare earth elements, and comprises Pr and Nd; T represents Fe, Mn, Al and Co; R1 represents at least one rare earth element, and comprises at least one of Dy and Tb; the main phase contains Pr, Nd, Fe, Mn, Al, Co and B; and the grain boundary phase further contains at least one of Nb and Ti; and contents of N, F, Mn, Al, Tb, Dy, Pr, Nd, Co, Ga, Zr and Cu in the NdFeB permanent magnet are respectively: 0.03 wt %≦N≦0.09 wt %; 0.005 wt %≦F≦0.5 wt %; 0.011 wt %≦Mn≦0.027 wt %; 0.1 wt %≦Al≦0.6 wt %; 0.1 wt %≦Tb≦2.9 wt %; 0.1 wt %≦Dy≦3.9 wt %; 3 wt %≦Pr≦14 wt %; 13 wt %≦Nd≦28 wt %; 0.6 wt %≦Co≦2.8 wt %; 0.09 wt %≦Ga≦0.19 wt %; 0.06 wt %≦Zr≦0.19 wt %; and 0.08 wt %≦Cu≦0.24 wt %. |
