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Coercivity Enhancement of Nd-Fe-B HDDR Powder by Grain Boundary Diffusion Process with Rare-Earth Hydride

  • Powder Metallurgy of Non-Ferrous Metals
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Abstract

The grain boundary diffusion (GBD) process with rare-earth hydride was performed to increase the coercivity of hydrogenation–disproportionation–desorption–recombination (HDDR) powder. Before the GBD process, we investigated the effect of post-annealing of the initial HDDR powder on its magnetic properties. Low-temperature annealing reduced the coercivity of the HDDR powder. However, the coercivity decline decreased with increasing annealing temperature, becoming similar to that of the initial powder at 900°C. After the GBD process at 850°C for 1 h, the coercivity increased by about 4 kOe with 4 wt.% NdH x -Cu, forming a thick and continuous grain boundary phase. In addition, the coercivity and remanence of the HDDR powder produced by the GBD process with NdH x -Cu were higher when using NdH x in spite of the same amount of diffusion as at 2 wt.%.

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Acknowledgements

This study was supported by the Korea Institute of Materials Science (KIMS) internal R&D program (Grant No. PNK5590) and Industrial Strategic Technology Development Program (10080382) funded by the Ministry of Trade, Industry & Energy (MI, Korea).

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Authors and Affiliations

  1. Powder and Ceramics Division, Korea Institute of Materials Science, 797 Changwon-daero, Changwon, 51508, Korea

    Hee-Ryoung Cha, Jae-Gyeong Yoo, Youn-Kyoung Baek & Jung-Goo Lee

  2. Department of Nano Fusion Technology, Pusan National University, Jangjeon 2-dong, Geumjeong-gu, Busan, 46241, Korea

    Jae-Gyeong Yoo & Dongyun Lee

  3. Research Center of SG Tech., Star Group Ind. Co., Ltd., 49, Dalseo-daero 85-gil, Dalseo-gu, Daegu, Korea

    Dong-Hwan Kim

  4. Department of Materials Science and Engineering, Pukyong National University, 45 Yongso-ro, Nam-Gu, Busan, 48547, Korea

    Hae-Woong Kwon

  5. Department of Materials Science and Engineering, Pusan National University, Jangjeon 2-dong, Geumjeong-gu, Busan, 46241, Korea

    Yang-Do Kim

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  1. Hee-Ryoung Cha
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Correspondence to Jung-Goo Lee.

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Cha, HR., Yoo, JG., Baek, YK. et al. Coercivity Enhancement of Nd-Fe-B HDDR Powder by Grain Boundary Diffusion Process with Rare-Earth Hydride. JOM 70, 661–665 (2018). https://doi.org/10.1007/s11837-018-2792-5

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  • DOI: https://doi.org/10.1007/s11837-018-2792-5

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