Effect of the Ce Content on the Magnetic Properties and Microstructure of CeCo5-based Sintered Bulk Magnets
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CeCo5-based magnets have recently attracted much attention due to their moderate magnetic performance and low cost. Nevertheless, there have been few studies on the effects of Ce content on the magnetic properties and microstructures of CeCo5-based magnets. In response to this, the magnetic properties of sintered bulk magnets with nominal compositions of Ce(Co0.73Cu0.135Fe0.135) z (z = 4.95, 5.15, 5.35, and 5.55), prepared by the conventional powder metallurgy method, were investigated here. Based on experimental findings, it was shown that Ce(Co0.73Cu0.135Fe0.135)5.15 sintered bulk magnets had comprehensive magnetic properties—maximum energy product of 80 kJ m− 3 (10 MGOe) and intrinsic coercivity (H cj) of 452 kA m− 1 (5.69 kOe)—superior to those previously reported by us. For z = 5.35 and 5.55, due to the presence of the minor Ce2Co17 phase (which has a Curie temperature (T c ) < 20 °C), magnets had low H cj values. Based on x-ray diffraction and scanning electron microscopy observations, it was suggested that the volume fraction of the 1:5 matrix phase was the main factor determining the H cj of CeCo5-based sintered bulk magnets obtained with different Ce contents. Furthermore, the importance of the dispersion characteristics of the Ce2O3 phase within the matrix was emphasized. Uniform dispersion of the Ce2O3 phase can significantly improve the overall magnetic performance of CeCo5-based magnets.
KeywordsMagnetic properties Microstructure Sintered magnets Powder metallurgy CeCo5-based magnets
We would like to thank Editage (www.editage.com) for English language editing and publication support.
This study was funded by the National Basic Research Program of China (973 Program) (grant number 2014CB643701) and the National Natural Science Foundation of China (grant numbers 51371054 and 51171049).
Compliance with Ethical Standards
This article does not contain any studies with humans or animals subjects performed by any of the authors.
Conflict of Interest
The authors declare that they have no competing interests.
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