Improvement of Coercivity and Corrosion Resistance of Nd–Fe–B Sintered Magnets with Cu Nano-particles Doping

J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (10): 927-930.

• Mechanical and Functional Properties of Materials • Previous Articles Next Articles

Improvement of Coercivity and Corrosion Resistance of Nd–Fe–B Sintered Magnets with Cu Nano-particles Doping

C. Sun¹⁾, W.Q. Liu¹⁾, H. Sun¹⁾, M. Yue¹⁾, X.F. Yi²⁾, J.W. Chen²⁾

1) College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
2) Earth-panda Advance Magnetic Material Co., Ltd., Anhui 231500, China

Received:2012-06-26 Revised:2012-08-22 Online:2012-10-30 Published:2012-10-31
Contact: W.Q. Liu, M. Yue
Supported by:
the National Natural Science Foundation of China (No. 51001002), the Research Fund for the Doctoral Program of Higher Education of China (No. 20091103120024), the National High Technology Research and Development Program of China (No. 2012AA063201), the Key Program of Science and Technology Development Project of Beijing Municipal Education Commission (No. KZ201110005007), 211 Project of Beijing University of Technology and Rixin Talents of Beijing University of Technology

Abstract

Abstract:

Nd–Fe–B permanent magnets with a small amount of Cu nano-particles doping have been prepared by conventional sintered method. E®ects of Cu content on magnetic properties, corrosion resistance, and oxidation properties of the magnets have been studied. It shows that the coercivity rises gradually, while the remanence decreases simultaneously with increasing Cu doping amount. Microstructure observation reveals that Cu element enriches mainly the Nd-rich phase. Autoclave test results show that the corrosion rate of the magnets decreases with increasing Cu content. After oxidation, the maximum energy product loss of the magnets with 0 and 0.2 wt% Cu nano-particles doping are 6.13% and 0.99%, respectively. Therefore, it is concluded that Cu nano-particles doping is a promising way to enhance the coercivity and corrosion resistance of sintered Nd–Fe–B magnets.

Key words: Nd–Fe–B , Cu nano-particles , Coercivity , Corrosion resistance , Oxidation

C. Sun, W.Q. Liu, H. Sun, M. Yue, X.F. Yi, J.W. Chen. Improvement of Coercivity and Corrosion Resistance of Nd–Fe–B Sintered Magnets with Cu Nano-particles Doping[J]. J. Mater. Sci. Technol., 2012, 28(10): 927-930.

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Improvement of Coercivity and Corrosion Resistance of Nd–Fe–B Sintered Magnets with Cu Nano-particles Doping

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