Rare-earth permanent magnetic powder, bonded magnet, and device comprising the same

摘要

A rare-earth permanent magnetic powder, a bonded magnet, and a device comprising the bonded magnet are provided. The rare-earth permanent magnetic powder is mainly composed of 7-12 at % of Sm, 0.1-1.5 at % of M, 10-15 at % of N, 0.1-1.5 at % of Si, and Fe as the balance, wherein M is at least one element selected from the group of Be, Cr, Al, Ti, Ga, Nb, Zr, Ta, Mo, and V, and the main phase of the rare-earth permanent magnetic powder is of TbCu7 structure. Element Si is added into the rare-earth permanent magnetic powder for increasing the ability of SmFe alloy to from amorphous structure, and for increasing the wettability of the alloy liquid together with the addition of element M in a certain content, which enables the alloy liquid prone to be injected out of a melting device. The average diameter of the rare-earth permanent magnetic powder is in the range of 10-100 μm, and the rare-earth permanent magnetic powder is composed of nanometer crystals with average grain size of 10-120 nm or amorphous structure.

主权项

1. A rare-earth permanent magnetic powder, wherein the rare-earth permanent magnetic powder consists essentially of 7˜12 at % 0 of Sm, Fe, M, 0.1˜1.5 at % Si and 5˜20 at % of N, Fe is as the balance, M consists essentially of 0.1˜3 at % of Zr and 0.1˜1.5 at % of R, wherein R is selected from the group consisting of Be, Cr, Al, Ti, Ga, Nb, Ta, Mo, and V, part of element Sm in the rare-earth permanent magnetic powder is replaced by other rare-earth elements and the other rare-earth accounts for 0˜10 at %, part of element Fe in the rare-earth permanent magnetic powder is replaced by element Co and Co accounts for 0˜30 at %, and at least 80 vol % of the rare-earth permanent magnetic powder is TbCu7 phase, and wherein the atomic ratio of R to Zr is in the range of 0.05˜0.5.