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

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概要

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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.

• 社団法人 粉体粉末冶金協会の論文
• 2003-11-15

著者

• Lim Tae-whan

  Division Of Materials And Chemical Engineering Sunmoon University

• JANG Taesuk

  Division of Materials and Chemical Engineering, Sunmoon University

• LEE Dae-Hoon

  Division of Materials and Chemical Engineering, Sunmoon University

• CHOI C.

  Nanopowder Materials Group, Korea Institute of Machinery & Materials

• KIM B.

  Nanopowder Materials Group, Korea Institute of Machinery & Materials

• Choi C.

  Nanopowder Materials Group Korea Institute Of Machinery & Materials

• Jang Taesuk

  Division Of Materials And Chemical Engineering Sunmoon University

• Lee Dae-hoon

  Division Of Materials And Chemical Engineering Sunmoon University

関連論文

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

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