Bi-modal particle size distribution for high energy product hybrid Nd-Fe-B—Sm-Fe-N bonded magnets

Harshida Parmar; M. Parans Paranthaman; I. C. Nlebedim

doi:10.1063/9.0000819

Bi-modal particle size distribution for high energy product hybrid Nd-Fe-B—Sm-Fe-N bonded magnets

Harshida Parmar, M. Parans Paranthaman, I. C. Nlebedim

Nanomaterials Chemistry Group

Research output: Contribution to journal › Article › peer-review

Abstract

In this work, we have demonstrated high energy product bonded magnet by leveraging the variation in sizes between Nd-Fe-B and Sm-Fe-N, as well as their hard magnetic properties. The hybrid anisotropic bonded magnets contain 70 vol% of magnet powder (Dy-free Nd-Fe-B and Sm-Fe-N) and 30 vol% of nylon. The objective of the work was to create bi-modal and bi-compositional bonded magnets in which the fine (3μm) particles of Sm-Fe-N would be used to fill the voids between the bigger Nd-Fe-B (105μm) particles, thus improve packing density. The magnetic hysteresis loop did not show significant signs of decoupled interactions between the magnetic phases. It was also found that the performance of the bonded magnet was most enhanced at 1:4 ratio of Nd-Fe-B and Sm-Fe-N. At that ratio, maximum density of 5 g/cm³ and the highest (BH)_max value of 18.5 MGOe were obtained, although the intrinsic coercivity decreased, relative to the trend seen for other ratios. This work advances the opportunity to expand the use of Sm-Fe-N in bonded magnet applications.

Original language	English
Article number	015329
Journal	AIP Advances
Volume	14
Issue number	1
DOIs	https://doi.org/10.1063/9.0000819
State	Published - Jan 1 2024

Funding

This work is supported by the Critical Materials Innovation Hub, funded by the U.S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, Advanced Materials and Manufacturing Technologies Office. The work was performed in part at Ames National Laboratory, operated for the U.S. Department of Energy by Iowa State University of Science and Technology under Contract No. DE-AC02-07CH11358. This manuscript has been authored in part by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan )

Funders	Funder number
Iowa State University	DE-AC02-07CH11358
U.S. Department of Energy
U.S. Department of Energy
Advanced Materials and Manufacturing Technologies Office
Ames National Laboratory
Office of Energy Efficiency and Renewable Energy
U.S. Department of Energy
U.S. Department of Energy

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abstract = "In this work, we have demonstrated high energy product bonded magnet by leveraging the variation in sizes between Nd-Fe-B and Sm-Fe-N, as well as their hard magnetic properties. The hybrid anisotropic bonded magnets contain 70 vol% of magnet powder (Dy-free Nd-Fe-B and Sm-Fe-N) and 30 vol% of nylon. The objective of the work was to create bi-modal and bi-compositional bonded magnets in which the fine (3μm) particles of Sm-Fe-N would be used to fill the voids between the bigger Nd-Fe-B (105μm) particles, thus improve packing density. The magnetic hysteresis loop did not show significant signs of decoupled interactions between the magnetic phases. It was also found that the performance of the bonded magnet was most enhanced at 1:4 ratio of Nd-Fe-B and Sm-Fe-N. At that ratio, maximum density of 5 g/cm3 and the highest (BH)max value of 18.5 MGOe were obtained, although the intrinsic coercivity decreased, relative to the trend seen for other ratios. This work advances the opportunity to expand the use of Sm-Fe-N in bonded magnet applications.",

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Bi-modal particle size distribution for high energy product hybrid Nd-Fe-B—Sm-Fe-N bonded magnets

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