Development of anisotropic Nd-Fe-B powder from isotropic gas atomized powder

Gabriela Sarriegui; Malik Degri; Mihail Ipatov; Lydia Pickering; Blanca Luna Checa; Nerea Burgos; Muhammad Awais; Richard Sheridan; Allan Walton; José Manuel Martín; Julián González

doi:10.1016/j.powtec.2023.119067

Development of anisotropic Nd-Fe-B powder from isotropic gas atomized powder

Gabriela Sarriegui^*, Malik Degri, Mihail Ipatov, Lydia Pickering, Blanca Luna Checa, Nerea Burgos, Muhammad Awais, Richard Sheridan, Allan Walton, José Manuel Martín, Julián González

^*Corresponding author for this work

Metallurgy and Materials

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Abstract

This work presents an innovative approach to obtain anisotropic Nd-Fe-B powder from isotropic gas atomized powder. The new process was developed using a ternary Nd-Fe-B alloy, without the requirement for additional heavy rare earth or other critical raw materials. It comprises the following steps: (a) gas atomization to produce a polycrystalline isotropic powder; (b) annealing at high temperature to induce grain growth; (c) hydrogen decrepitation to obtain a monocrystalline powder; and (d) hydrogenation-disproportionation-desorption-recombination to obtain the final ultrafine anisotropic particles. The final particle shape is polygonal, which should improve the injection molding characteristics of current powder. The final powder exhibits both high remanence (0.97 T) and coercivity (1354 kA/m) for laboratory batch sizes, which is a result of its anisotropic ultrafine microstructure. Thus, gas atomization is considered a feasible alternative to casting methods as a first step to produce powders for anisotropic bonded magnet.

Original language	English
Article number	119067
Number of pages	6
Journal	Powder Technology
Volume	431
Early online date	18 Oct 2023
DOIs	https://doi.org/10.1016/j.powtec.2023.119067
Publication status	Published - 1 Jan 2024

Bibliographical note

Acknowledgments:
This work has received funding from the European Union Research and Innovation Programs Horizon 2020, under grant agreement No. 720838 (NEOHIRE project), and FP7, under grant agreement No. 310240 (REMANENCE project). The authors want to acknowledge Aichi Steel Corporation for the fruitful discussion during the execution of this project.

Keywords

Hydrogen absorbing materials
Permanent magnets
Rare earth alloys and compounds
Crystal growth
Powder metallurgy
Magnetic measurements

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10.1016/j.powtec.2023.119067Licence: Creative Commons: Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)

SarrieguiG2023DevelopmentFinal published version, 5.19 MBLicence: Creative Commons: Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)

H2020_RIA_NEOHIRE
Walton, A.
European Commission
1/02/17 → 31/01/20
Project: EU
FP7_COLLAB_REMANENCE: Rare Earth Magnet Recovery for Environmental and Resource Protection
Walton, A. & Rowson, N.
European Commission, European Commission - Management Costs
1/01/13 → 30/06/16
Project: Research

Cite this

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title = "Development of anisotropic Nd-Fe-B powder from isotropic gas atomized powder",

abstract = "This work presents an innovative approach to obtain anisotropic Nd-Fe-B powder from isotropic gas atomized powder. The new process was developed using a ternary Nd-Fe-B alloy, without the requirement for additional heavy rare earth or other critical raw materials. It comprises the following steps: (a) gas atomization to produce a polycrystalline isotropic powder; (b) annealing at high temperature to induce grain growth; (c) hydrogen decrepitation to obtain a monocrystalline powder; and (d) hydrogenation-disproportionation-desorption-recombination to obtain the final ultrafine anisotropic particles. The final particle shape is polygonal, which should improve the injection molding characteristics of current powder. The final powder exhibits both high remanence (0.97 T) and coercivity (1354 kA/m) for laboratory batch sizes, which is a result of its anisotropic ultrafine microstructure. Thus, gas atomization is considered a feasible alternative to casting methods as a first step to produce powders for anisotropic bonded magnet.",

keywords = "Hydrogen absorbing materials, Permanent magnets, Rare earth alloys and compounds, Crystal growth, Powder metallurgy, Magnetic measurements",

author = "Gabriela Sarriegui and Malik Degri and Mihail Ipatov and Lydia Pickering and Checa, {Blanca Luna} and Nerea Burgos and Muhammad Awais and Richard Sheridan and Allan Walton and Mart{\'i}n, {Jos{\'e} Manuel} and Juli{\'a}n Gonz{\'a}lez",

note = "Acknowledgments: This work has received funding from the European Union Research and Innovation Programs Horizon 2020, under grant agreement No. 720838 (NEOHIRE project), and FP7, under grant agreement No. 310240 (REMANENCE project). The authors want to acknowledge Aichi Steel Corporation for the fruitful discussion during the execution of this project.",

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T1 - Development of anisotropic Nd-Fe-B powder from isotropic gas atomized powder

AU - Sarriegui, Gabriela

AU - Degri, Malik

AU - Ipatov, Mihail

AU - Pickering, Lydia

AU - Checa, Blanca Luna

AU - Burgos, Nerea

AU - Awais, Muhammad

AU - Sheridan, Richard

AU - Walton, Allan

AU - Martín, José Manuel

AU - González, Julián

N1 - Acknowledgments: This work has received funding from the European Union Research and Innovation Programs Horizon 2020, under grant agreement No. 720838 (NEOHIRE project), and FP7, under grant agreement No. 310240 (REMANENCE project). The authors want to acknowledge Aichi Steel Corporation for the fruitful discussion during the execution of this project.

PY - 2024/1/1

Y1 - 2024/1/1

N2 - This work presents an innovative approach to obtain anisotropic Nd-Fe-B powder from isotropic gas atomized powder. The new process was developed using a ternary Nd-Fe-B alloy, without the requirement for additional heavy rare earth or other critical raw materials. It comprises the following steps: (a) gas atomization to produce a polycrystalline isotropic powder; (b) annealing at high temperature to induce grain growth; (c) hydrogen decrepitation to obtain a monocrystalline powder; and (d) hydrogenation-disproportionation-desorption-recombination to obtain the final ultrafine anisotropic particles. The final particle shape is polygonal, which should improve the injection molding characteristics of current powder. The final powder exhibits both high remanence (0.97 T) and coercivity (1354 kA/m) for laboratory batch sizes, which is a result of its anisotropic ultrafine microstructure. Thus, gas atomization is considered a feasible alternative to casting methods as a first step to produce powders for anisotropic bonded magnet.

AB - This work presents an innovative approach to obtain anisotropic Nd-Fe-B powder from isotropic gas atomized powder. The new process was developed using a ternary Nd-Fe-B alloy, without the requirement for additional heavy rare earth or other critical raw materials. It comprises the following steps: (a) gas atomization to produce a polycrystalline isotropic powder; (b) annealing at high temperature to induce grain growth; (c) hydrogen decrepitation to obtain a monocrystalline powder; and (d) hydrogenation-disproportionation-desorption-recombination to obtain the final ultrafine anisotropic particles. The final particle shape is polygonal, which should improve the injection molding characteristics of current powder. The final powder exhibits both high remanence (0.97 T) and coercivity (1354 kA/m) for laboratory batch sizes, which is a result of its anisotropic ultrafine microstructure. Thus, gas atomization is considered a feasible alternative to casting methods as a first step to produce powders for anisotropic bonded magnet.

KW - Hydrogen absorbing materials

KW - Permanent magnets

KW - Rare earth alloys and compounds

KW - Crystal growth

KW - Powder metallurgy

KW - Magnetic measurements

U2 - 10.1016/j.powtec.2023.119067

DO - 10.1016/j.powtec.2023.119067

M3 - Article

SN - 0032-5910

VL - 431

JO - Powder Technology

JF - Powder Technology

M1 - 119067

ER -

Development of anisotropic Nd-Fe-B powder from isotropic gas atomized powder

Abstract

Bibliographical note

Keywords

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Projects

H2020_RIA_NEOHIRE

FP7_COLLAB_REMANENCE: Rare Earth Magnet Recovery for Environmental and Resource Protection

Cite this