Synthesis of Hard Magnetic Nd-Fe-B Powders by a Thermochemical Process

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Fabrication of Nd-Fe-B magnetic powders by R-D process using spray-dried precursors was tried. Due to stable formation of a-Fe as a primary phase as same as that in ingots, the hard magnetic Nd<SUB>2</SUB>Fe<SUB>14</SUB>B phase was not formed in the alloy powder with the composition of stoichiometric Nd<SUB>2</SUB>Fe<SUB>14</SUB>B unless excessive amount of Nd precursor or Ca was added in the process. However, this excessive addition, especially for Ca, led to abnormal grain growth of Nd<SUB>2</SUB>Fe<SUB>14</SUB>B. On the contrary, Nd<SUB>2</SUB>Fe<SUB>14</SUB>B was successfully obtained as a major phase from the alloy powder with the composition of Nd<SUB>15</SUB>Fe<SUB>77</SUB>B<SUB>8</SUB> without such excessive addition. The size of spherical shape Nd<SUB>2</SUB>Fe<SUB>14</SUB>B particles mostly consisted of one or more subgrains was less than 1, um. The coercivity measured from this powder was relatively low (-3 kOe) mostly due to residual CaO and soft magnetic phases.

収録刊行物

  • 粉体および粉末冶金

    粉体および粉末冶金 50(11), 889-893, 2003-11-15

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10012549405
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    6787017
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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