Permanent magnet and method for manufacturing the same, and motor and power generator using the same

摘要

In an embodiment, a permanent magnet includes a composition of R (FepMqCur(Co1-sAs)1-p-q-r)z (R: rare earth element, M: Ti, Zr, Hf, A: Ni, V, Cr, Mn, Al, Si, Ga, Nb, Ta, W, 0.05≦p 0.6, 0.005≦q≦0.1, 0.01≦r≦0.15, 0≦s≦0.2, 4≦z≦9). The permanent magnet includes a two-phase structure of a Th2Zn17 crystal phase and a copper-rich phase. An average interval between the copper-rich phases in a cross section including a crystal c axis of the Th2Zn17 crystal phase is in a range of over 120 nm and less than 500 nm.

主权项

1. A permanent magnet comprising:
a composition expressed by the following composition formula:
Sm(FepMqCur(Co1-sAs)1-p-q-r)z, wherein M is at least one element selected from the group consisting of Ti, Zr, and Hf, wherein a content of Ti is 10 atomic % or less of the element M, A is at least one element selected from the group consisting of Ni, V, Cr, Mn, Al, Nb, Ta, and W, p is a number, which is an atomic ratio, satisfying 0.31≦p≦0.6, q is a number, which is an atomic ratio, satisfying 0.005≦q≦0.1, r is a number, which is an atomic ratio, satisfying 0.01≦r≦0.15, s is a number, which is an atomic ratio, satisfying 0≦s≦0.2, z is a number, which is an atomic ratio, satisfying 4≦z≦9; and a structure which comprises a Th2Zn17 crystal phase and a copper-rich phase having a copper concentration by weight percent from 1.2 to 5 times a copper concentration by weight percent in the Th2Zn17 crystal phase, wherein an average interval d between the copper-rich phases in a cross section including a crystal c axis of the Th2Zn17 crystal phase is greater than 120 nm and less than 500 nm, and wherein a magnetic coercive force of the permanent magnet is from 100 to 500 kA/m, and a residual magnetization of the permanent magnet is 1.17 T or more.