Patent ID: 9514870
Filing Date: 2016-12-06
CPC Classification: B22F,C22C,H01F

Claim Text:
1. A method for producing a rare earth magnet, comprising: a placing step of placing a magnet material including a compact or a sintered body of powder particles having a rare earth magnet alloy, and a diffusing material containing a diffusing element to improve coercivity, in a vicinity of each other; and a diffusing step of diffusing the diffusing element into an inside of the magnet material by exposing the magnet material to vapor of the diffusing element evaporated from the diffusing material; wherein: the diffusing step includes heating the diffusing material independently of the magnet material; the magnet material is heated to a magnet material temperature (Tm) that is higher than a diffusing material temperature (Td) to which the diffusing material is heated; a temperature difference between the magnet material temperature and the diffusion material temperature (ΔT=Tm−Td) is from 20 to 130 deg. C.; the magnet material temperature is from 850 to 900 deg. C.; and the diffusing element is dysprosium.