| 简介 |
FIELD : physics.
SUBSTANCE : disclosed is a method of making a permanent magnet with Dy and Tb diffused into the crystalline grain-boundary phase of a sintered magnet (S). Obtaining a sintered magnet with good magnetic properties over a short period of time is the technical result of this invention. In particular, the sintered magnet (S) based on an iron-boron-rare-earth element is placed in a working chamber (20) which is heated to a defined temperature while evaporating material (V) which is placed in the same or another working chamber and consists of a hydride containing at least one of Dy and Tb. The evaporated material adheres to the surface of the sintered magnet, and Dy and/or Tb atoms in the adhered evaporated material diffuse into the crystalline grain-boundary phase of the sintered magnet, wherein diffusion of metal atoms takes place before a thin film of at least one of Dy and Tb forms on the surface of the sintered magnet.
EFFECT : method does not have a preliminary step for cleaning the surface of the sintered magnet before attachment of Dy or Tb onto the surface of the sintered magnet, which improves efficiency.
6 cl, 6 dwg, 1 ex |
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