| 简介 |
FIELD : physics.
SUBSTANCE : disclosed is a permanent magnet which is made by forming a Dy and/or Tb film on the surface of a sintered magnet based on an iron-boron-rare-earth element, with given configuration, followed by diffusion of elements from the film into the crystalline grain-boundary phase of the permanent magnet. Deposition of evaporated Dy and/or Tb atoms onto the surface of the sintered magnet, for their subsequent diffusion inside, takes place due to the temperature difference between the inside of the chamber and the sintered magnet. Disclosed also is a method of making a permanent magnet, comprising a step for forming a film by evaporating evaporable metallic material containing at least Dy or Tb, a step for attaching the evaporated metal molecules to the surface of the sintered magnet based on the iron-boron-rare-earth element, and a step for diffusion with diffusion of the metal atoms attached to the surface during thermal treatment into the grain-boundary phase of the sintered magnet, wherein the evaporable metallic material contains at least either Nd or Pr.
EFFECT : permanent magnet obtained using said method has high coercitive force and improved magnetic properties.
14 cl, 12 dwg, 6 ex |
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