EFFECT OF BINARY ADDITIVES ON THE MAGNETIC PROPERTIES OF MECHANICALLY GROUND Fe-Nd-B MAGNETS

  • Jang, T.S. (Dept. of Metallurgical Engineering, Sun Moon University) ;
  • Park, J.D. (Division of Materials, KIST) ;
  • Jeung, W.Y. (Division of Materials, KIST)
  • 발행 : 1995.10.01

초록

The magnetic properties of the hot-pressed magnets made from the Fe-Nd-B alloys, mechanically ground and subsequently blended with binary additives such as Al-Cu and Ag-Zn before hot pressing, were investigated. The coercivities of the magnets increased as the concentration of Al-Cu increased up to 1 wt.% or up to 3 wt.% in the case of Ag-Zn. At higher concentrations the coercivities decreased markedly. The maximum gain in coercivity by the addition was about 20 %. typical values of $_{i}H_{c}$ and $B_{r}$ of a hotpressed magnet containing 1 wt.% Al-Cu were 18 kOe and 7 kG, respectively. It was found that Cu, Ag, and Zn, which diffused into the magnet during hot pressing, were mostly concentrated on the Nd-rich grain boundary phase whereas Al was present not only in the grain boundary region but also in the matrix grains.

키워드

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