• Title/Summary/Keyword: B powder

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Basic Study on the Production of Nd-Fe-B System Rare Earth Anisotropic bonded Magnet Materials by the R-D & HDDR Process(I) (R-D & HDDR Process에 의한 Nd-Fe-B계 희토류 이방성 본드자석재료의 제조에 관한 기초연구 (I))

  • Jo, Seon-Mi;Son, Chang-Bin;Jo, Tong-Rae
    • Korean Journal of Materials Research
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    • v.11 no.7
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    • pp.609-614
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    • 2001

  • This study was carried out to obtain a basic data on the production of the Nd-Fe-B system rare earth anisotropic bonded magnet by R-D & HDDR process. The reduction reaction of Nd$_2$O$_3$by metallic Ca and the diffusion reaction of Nd into Fe-B alloy powder were investigated for the production the Nd-Fe-B alloy powder. We concluded that a proper quantity of metallic Ca was about 1.3 times of theoretical equivalent from the yields of Nd and B after the R-D reaction at 100$0^{\circ}C$ for 1h. In the XRD analysis the diffusion reaction of Nd into the center of Fe-B alloy powder for the completed homogenization was required through about 45min at 110$0^{\circ}C$ for the R-D reaction, and also the maximum efficiency on the yield of Nd was obtained with such a condition. Residual Ca and oxygen contents of the final powder sample after washing were detected in 0.17wt% and 0.42wt% by ICP and oxygen analyzer, respectively.

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