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Effect of the Ce Content on the Magnetic Properties and Microstructure of CeCo5-based Sintered Bulk Magnets

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Abstract

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.

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Acknowledgements

We would like to thank Editage (www.editage.com) for English language editing and publication support.

Funding

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).

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Authors and Affiliations

  1. Functional Materials Research Institute, Central Iron & Steel Research Institute, No. 76 Xueyuan Nanlu, Haidian District, Beijing, 100081, China

    Wei Sun, Kui-kui Song, Ming-gang Zhu, Yi-kun Fang, Neng-jun Yu, Shuai Wang & Wei Li

  2. Beijing Engineering Laboratory of Advanced Metallic Magnetic Materials and Preparation Techniques, Beijing, 100081, China

    Wei Sun, Kui-kui Song, Ming-gang Zhu, Yi-kun Fang, Neng-jun Yu, Shuai Wang & Wei Li

  3. National Engineering Research Center for Magnetic Materials, Beijing, 102600, China

    Wei Sun

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  1. Wei Sun
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  2. Kui-kui Song
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Correspondence to Ming-gang Zhu.

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This article does not contain any studies with humans or animals subjects performed by any of the authors.

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The authors declare that they have no competing interests.

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Sun, W., Song, Kk., Zhu, Mg. et al. Effect of the Ce Content on the Magnetic Properties and Microstructure of CeCo5-based Sintered Bulk Magnets. J Supercond Nov Magn 31, 1761–1765 (2018). https://doi.org/10.1007/s10948-017-4387-8

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  • DOI: https://doi.org/10.1007/s10948-017-4387-8

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