Rare earth permanent magnet material and preparation method thereof
AssigneeAdvanced Technology Materials, Inc.
InventorsLei Zhou, Tao Liu, Xinghua Cheng, Xiaojun Yu
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Abstract
The present invention discloses a rare earth permanent magnet material and a preparation method thereof. The method includes a sintering treatment step performed by laying a composite powder for diffusion on the surface of a neodymium iron boron magnetic powder layer and carrying out spark plasma sintering treatment to obtain a neodymium iron boron magnet with a diffusion layer solidified on the surface thereof, and diffusion heat treatment and tempering steps. The method of the present invention has high efficiency, good diffusion effects, and reduced quantities of heavy rare earth elements.
Claims11
A preparation method of a rare earth permanent magnet material, characterized by comprising:
- a sintering treatment step performed by laying a composite powder for diffusion on the surface of a neodymium iron boron magnetic powder layer and carrying out spark plasma sintering treatment to obtain a neodymium iron boron magnet with a diffusion layer solidified on the surface thereof, wherein a compositional proportional formula of the composite powder for diffusion is (TbF3)95Nd2Al3, (DyF3)95Nd1Al4, (DyF3)85Nd5Al10, (DyF3)83Nd10Al7 or (DyF3)75Nd18Al7;
- a diffusion heat treatment step performed by carrying out a diffusion heat treatment on the neodymium iron boron magnet with the diffusion layer solidified on the surface thereof and performing a cooling to obtain a diffused neodymium iron boron magnet;
- and
- a tempering treatment step performed by carrying out a tempering treatment on the diffused neodymium iron boron magnet to obtain the rare earth permanent magnet material.
Dependencies are inferred from the claim text.