Patent ID: 11967455
Assignee: YUAN DONG
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  H  C | IPC B  H

Claim 3:
4. The method for preparing a rare-earth permanent magnet by hot press molding according to claim 1, wherein in the step 2), the HD treatment process comprises steps of:
a) mixing a powder of the RTM alloy in 1 μm to 100 μm with the RFeB alloy and loading the mixture into an HD treatment furnace;
b) filling with hydrogen after a vacuum degree in the HD treatment furnace reaches 0.1 Pa, maintaining a pressure in the HD treatment furnace at 0.05 MPa to 0.2 MPa, and performing saturated hydrogen absorption;
c) permeating and dehydrogenating for 60 min to 240 min at 750° C. to 950° C.;
d) stopping heating; and
e) cooling, then sealing and taking out from the furnace.