High Coercive Force α-Fe/Nd_2Fe_<14>B-type Nanocomposites

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概要

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• α-Fe/R_2Fe_<14>B-type exchange-coupled NdFeB nanocomposites with an intrinsic coercivity, _iH_c, of 9.5-13.2 kOe and maximum energy product, (BH)_<max>, of 16-19. 8 MGOe have been successfully produced from melt spun ribbons with compositions of (Nd_<0.95>La_<0.05>)_<10.5-11>Fe_<bal.>Cr_2B_<10> and (Nd_<0.95>La_<0.05>)_<9.5>Fe_<68>Co_<10>Cr_2B_<10.5>. It was found that a dilute substitution of La for Nd refines the grains, and a partial substitution of Cr for Fe suppresses the formation of the R_2Fe_<23>B_3 and Fe_3B phases during crystallization and promotes the formation of an α-Fe/R_2Fe_<14>B mixture. Unlike the ternary Nd-Fe-B system, La and/or Cr substitution are effective in suppressing the formation of Fe_3B and R_2Fe_<23>B_3 phase in the (Nd_<0.95>La_<0.05>)_<9.5>Fe_<88.5-x>Cr_2B_x, where x ranged from 6 to 10.5. Both B_r and (BH)_<max> decrease initially with increasing boron content, then increase slightly when the boron content was increased above 9. Some of the boron was presumed to react with Cr forming Cr-broides within R_2Fe_<14>B and near the grain boundary region. Increasing the total rare earth content in (Nd_<0.95>La_<0.05>)_yFe_<88-x>Cr_2B_<10> ribbons was found to enhance both the remanence, B_r, and the_iH_c of ribbons simultaneously. A B_r of 9.2 to 9.5kG, _iH_c of 11.1 to 13.2 kOe and (BH)_<max> of 16.5 to 18.0 MGOe have been obtained on (Nd_<0.95>La_<0.05>)_<10.5-11>Fe_<bal.>Cr_2B_<10>. Significant increases in B_r and (BH)_<max> values were obtained in (Nd_<0.95>La_<0.05>)_<9.5>Fe_<78-z>Co_zCr_2B_<10.5> when z is varied from 7.5 to 10. Microstructural change may play a critical role in explaining the high B_r, BH_<max> and _iH_c values obtained on (Nd_<0.95>La_<0.05>)_<9.5>Fe_<68>Co_<10>Cr_2B_<10.5>.

• 1999-01-20

著者

• Chang W.

  Department Of Physics Chung Cheng University

• Wu S.

  Department Of Electronic Engineering National Chiao Tung University

• Chiou D.

  Department of Physics, Chung Cheng University

• Ma B.

  Rhodia, Rare Earths and Gallium

• Chen Q.

  Rhodia, Rare Earths and Gallium

• Bounds C.

  Rhodia, Rare Earths and Gallium

• Chiou D.

  Department Of Physics Chung Cheng University

• Wu S.

  Department Of Anatomy And K.k. Leung Brain Research Centre Faculty Of Basic Medicine Fourth Military

• Chen Q

  Agriculture And Agri‐food Canada Alberta Can

• Ma B.

  Rhodia Rare Earths And Gallium

• Bounds C.

  Rhodia Rare Earths And Gallium

• Chang W.C.

  Department of Physics, Chung Cheng University

• Chiou D.Y.

  Department of Physics, Chung Cheng University

• Wu S.H.

  Department of Physics, Chung Cheng University

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