2019-Sustainable Industrial Processing Summit
SIPS2019 Volume 3: Kobe Intl. Symp. / Science of Innovative and Sustainable Alloys and Magnets (SISAM)

Editors:F. Kongoli, M. Calin, J.M. Dubois, K. Zuzek-Rozman
Publisher:Flogen Star OUTREACH
Publication Year:2019
Pages:156 pages
ISBN:978-1-989820-02-5
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Metal-Bonded Magnets Based on YCo5-Type Nanocrystals

    Marko Soderžnik1; Matic Korent2; Kristina Zagar Soderznik3; Jean-Marie Dubois4; Pelin Tozman5; M. Venkatesan6; Michael Coey7; Spomenka Kobe8;
    1JOžEF STEFAN INSTITUTE, Ljubljana, Slovenia; 2JOZZEF STEFAN INSTITUTE, LJUBLJANA, Slovenia; 3JOZEF STEFAN INSTITUTE, Ljubljana, Slovenia; 4JSI - K7 DPT FOR NANOSTRUCTURED MATERIALS, Ljubljana, Slovenia; 5NIMS, Tsukuba, Japan; 6SCHOOL OF PHYSICS AND CRANN, TRINITY COLLEGE, Dublin, Ireland; 7SCHOOL OF PHYSICS, Dublin, Ireland; 8JOSEF STEFAN INSTITUTE, Ljubljana, Slovenia;
    Type of Paper: Regular
    Id Paper: 342
    Topic: 42

    Abstract:

    Metal-bonded magnets based on YCo5-type nanocrystals [i] were produced by hot-compaction using a spark plasma-sintering device. Zn and Zn/Al metallic binders with a melting temperature of ̴ 420°C were employed to fabricate dense cylindrical magnets. Two different pressures were used for compaction. The pressure of 400 MPa provided a metal-bonded magnet with Vickers hardness (HV10) of 460 ± 20 Vickers. The temperature coefficients for remanence (α) and coercivity (β) were derived from magnetization vs. magnetic field measurements in the temperature range of 20°C – 150°C. Temperature coefficients α and β for the Zn/Al-bonded magnet pressed with 400 MPa were -0.055 %/°C and -0.201 %/°C, respectively. The field emission gun scanning electron microscope revealed a ‘core-shell’-type microstructure. The pure YCo4.8Fe0.2 phase was detected in the core region whereas the shell was enriched with non-ferromagnetic Zn or Zn/Al phases. The high-resolution transmission electron microscope revealed the presence of clusters with ̴ 20 nm YCo4.8Fe0.2 grains. In the Zn/Al-bonded magnet, fabricated at 400 MPa, the coercivity µ0Hci, remanent magnetization σ and energy product (BH)max were 0.87 T, 39.3 Am2/kg and 23.4 kJ/m3, respectively.[ii]

    Keywords:

    Energy applications; Magnetic Materials; Nanomaterials;

    References:

    [i] P. Tozman, M. Venkatesan, J. M. D. Coey, Optimization of the magnetic properties of nanostructured Y-Co-Fe alloys for permanent magnets, AIP Adv. 6 (2016) 056016.
    [ii] M. Soderžnik, M. Korent, K. Žagar Soderžnik, J.-M. Dubois, P. Tozman, M. Venkatesan, J. M. D. Coey, S. Kobe, Hot-compaction of YCo4.8Fe0.2 nanocrystals for metal-bonded magnets, J. Mag. and Magn. Mat. 460 (2018) 401-408.

    Cite this article as:

    Soderžnik M, Korent M, Zagar Soderznik K, Dubois J, Tozman P, Venkatesan M, Coey M, Kobe S. (2019). Metal-Bonded Magnets Based on YCo5-Type Nanocrystals. In F. Kongoli, M. Calin, J.M. Dubois, K. Zuzek-Rozman (Eds.), Sustainable Industrial Processing Summit SIPS2019 Volume 3: Kobe Intl. Symp. / Science of Innovative and Sustainable Alloys and Magnets (SISAM) (pp. 155-156). Montreal, Canada: FLOGEN Star Outreach