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J Mater Sci Technol  1999, Vol. 15 Issue (03): 198-202     DOI:
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Structure and Magnetic Properties of Nd-Fe-B/a-Fe Nanocomposite Magnets by Co, Nb, Dy Substitutions
Jian ZHANG, Xiaokai SUN, Wei LIU, Baozhi CUI, Xinguo ZHAO, Zhidong ZHANG
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China
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Abstract  Structure and magnetic properties of the nanocomposite magnets prepared by mechanical alloying procedure with composition 55 wt pct Nd (Fe0.92B0.08)5.5+45 wt pct a-Fe, 55 wt pct Nd(Fe0.8-xCo0.12Nbx B0.08)5.5+45 wt pct a-Fe (x=0.00, 0.01, 0.03) and 55 wt pct (Nd0.9Dy0.1) (Fe0.77Co0.12Nb0.03B0.08)5.5+45 wt pct a-Fe were studied. It was found that substitution of Co for Fe could significantly improve the permanent magnetic properties of the nanocomposite magnets and typically, the maximum magnetic energy product was increased from 104.8 kJ/m3 (13.1 MGOe) to 141.6 kJ/m3 (17.7 MGOe). In contrast to the case of conventional nominally single-phase magnets, the addition of Nb results in promoting the growth of a-Fe grain and is thus unfavorable for the improvement of permanent magnetic properties of the nanocomposites. Although the addition of Dy can increase the coercivity of the magnets, the increase of magnetic anisotropy of hard phase leads to decrease of the critical grain size of soft phase. Additionally it causes the difficulty of preparing the nanocomposites because it is more difficult to control the grain size of soft phase to meet the requirement of appropriate exchange coupling between hard and soft grains.
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Received: 13 January 1999      Published: 10 October 2009
Corresponding Authors: Xiaokai SUN     E-mail: xksun@imr.ac.cn

Cite this article:

Jian ZHANG, Xiaokai SUN, Wei LIU, Baozhi CUI, Xinguo ZHAO, Zhidong ZHANG. Structure and Magnetic Properties of Nd-Fe-B/a-Fe Nanocomposite Magnets by Co, Nb, Dy Substitutions. J Mater Sci Technol, 1999, 15(03): 198-202 .

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