• Title/Summary/Keyword: Nd-Fe-B-Cu합금

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Effect of Small Additives on the Microstructure of Strip-Cast Nd-Fe-B Alloys (소량의 첨가원소가 Strip-Cast Nd-Fe-B 향금의 미세 조직 형성에 미치는 영향)

  • Lee, D.H.;Jang, T.S.;Kim, D.H.;Kim, Andrew-S.
    • Journal of the Korean Magnetics Society
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    • v.14 no.5
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    • pp.196-200
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    • 2004

  • In order to improve dendritic formation of Nd$_2$Fe$\_$14/B phase in the strip-cast Nd-Fe-B alloys that are frequently used for production of high energy sintered magnets, effect of small substitutional additives such as Cu (0.3～1.0 at. %) and Co (0.5～1.5 at.%) on the phase formation and microstructures of the strip-cast alloys based on Nd$\_$14/Fe$\_$80/B$\_$6/ were investigated. As the amount of Cu addition increased, formation of Nd$_2$Fe$\_$14/B dendrites along the direction normal to the strip surface was suppressed with the reduction of the strip thickness mainly due to the increase of fluidity of the melt. However, both the dendrites and their <001> preferred orientation along the direction normal to the strip surface were improved with the increase of the strip thickness as the amount of Co addition increased. The dendrites became finer after small amount of Cu or Co was added. While small copper additions tended to stabilize the formation of primary Fe, small cobalt additions suppressed it. When small amount of Zr was added, however, the dendrite structures were totally collapsed with excessive grain growth of Nd$_2$Fe$\_$14/B.

  • https://doi.org/10.4283/JKMS.2004.14.5.196 인용 PDF KSCI

The Effect of Additional Elements and Grain Size Distribution on the Magnetic Properties of the Nd-Fe-B Sintered Magnets (Nd-Fe-B계 소결자석의 자기적 특성에 미치는 첨가원소와 결정립 분포의 영향)

  • Hong, Yeon-Gi;Kim, Jong-O
    • Korean Journal of Materials Research
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    • v.8 no.9
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    • pp.819-824
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    • 1998

  • The influence of casting cooling rate during the preparation of ingots on the grain size distribution and the magnetizing ability of $\textrm{Nd}_{16}\textrm{Fe}_{72}\textrm{V}_{4}\textrm{B}_{8}$ sintered magnets were investigated. Sintered magnets prepared from copper mold which allow a higher cooling rate, show a smaller grain size distribution and god magnetizing ability. The effects of adding bride forming elements, such as Cr, Mn, Nb, and W on the magnetic properties of Nd-Fe-B sintered magnets were also investigated. Both Cr and W addition increase coercivity and the resultant $\textrm{Nd}_{16}\textrm{Fe}_{72}\textrm{Cr}_{4}\textrm{B}_{9}$ alloy exhibits a similar magnetizing ability in comparison with $\textrm{Nd}_{16}\textrm{Fe}_{72}\textrm{V}_{4}\textrm{B}_{8}$ alloy.

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