Magnetic properties improvement of melt spun Co86.5Hf11.5B2 nanocomposites by refractory elements substitution

被引：3

作者：

Chang, H. W. ^{[1
]}

Lin, Y. H. ^{[2
]}

Shih, C. W. ^{[2
]}

Liao, M. C. ^{[2
]}

Lee, Y. I. ^{[2
]}

Chang, W. C. ^{[2
]}

Yang, C. C. ^{[3
]}

Shaw, C. C. ^{[4
]}

机构：

[1] Tunghai Univ, Dept Appl Phys, Taichung 407, Taiwan

[2] Natl Chung Cheng Univ, Dept Phys, Chiayi 621, Taiwan

[3] Chung Yuan Christian Univ, Dept Phys, Chungli 320, Taiwan

[4] Superrite Elect Co Ltd, Taipei 111, Taiwan

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2016年 / 401卷

关键词：

Rare-earth-free permanent magnetic materials; Co-Hf-based nanocomposites; PERMANENT-MAGNETS; RIBBONS; ENHANCEMENT; MECHANISM; ALLOYS;

D O I：

10.1016/j.jmmm.2015.11.035

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetic properties of melt spun Co86.5Hf(10.5)MB(2) ribbons with refractory elements substitution (M=Cr, Nb, Ti, Zr) have been studied. For ternary Co86.5Hf11.5B2 ribbon, permanent magnetic properties of B-r =0.71 T, H-i(c)= 192 kA/m, and (BH)(max)=34.4 kJ/m(3) are obtained, and they are significantly improved to B-r =0.73-0.76T, H-i(c)=136-216 kA/m and (BH)(max)=38.4-52.8 kJ/m(3) with M substitution. Summarized with the results of x-ray diffraction refinement, thermal magnetic analysis, and transmission electron microscopy, the Co86.5Hf10.5MB2 nanocomposites following the optimal crystallization treatment mainly consist of orthorhombic 7:1 and face-center-cubic Co phases. Fine microstructure with average grain size in the range of 12.5 19.6 nm promotes exchange coupling effect between magnetic grains, thus improving permanent magnetic properties. The magnetic field dependence of coercivity reveals that coercivity of the studied Co86.55Hf10.5MB2 nonocomposites is mainly governed by the reverse domain nucleation mechanism. (C) 2015 Published by Elsevier B.V.

引用

页码：1139 / 1144

页数：6

共 25 条

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