Morphology of NdFeB-Type Permanent Magnet Coercivity Enhancement by Heat Treatment Process

To understand the morphology of the coercivity enhancement by heat treatment, a commercial sintered NdFeB-type permanent magnet is annealed, and the coercivity is measured by Permagraph. It is shown that the coercivity is increased compared to the initial. Observation by X-Ray Diffraction (XRD) anal...

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Autores principales:	Eva Afrilinda, Dagus Resmana Djuanda, Shinta Virdhian, Martin Doloksaribu, Moch Iqbal Zaelana Muttahar, Sri Bimo Pratomo
Formato:	article
Lenguaje:	EN
Publicado:	Department of Chemistry, Universitas Gadjah Mada 2020
Materias:	ndfeb heat treatment coercivity magnetically decoupled decomposed Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/4259d04ab73949b6923f02107ae9009d
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spelling	oai:doaj.org-article:4259d04ab73949b6923f02107ae9009d2021-12-02T17:59:54ZMorphology of NdFeB-Type Permanent Magnet Coercivity Enhancement by Heat Treatment Process1411-94202460-157810.22146/ijc.59096https://doaj.org/article/4259d04ab73949b6923f02107ae9009d2020-12-01T00:00:00Zhttps://jurnal.ugm.ac.id/ijc/article/view/59096https://doaj.org/toc/1411-9420https://doaj.org/toc/2460-1578To understand the morphology of the coercivity enhancement by heat treatment, a commercial sintered NdFeB-type permanent magnet is annealed, and the coercivity is measured by Permagraph. It is shown that the coercivity is increased compared to the initial. Observation by X-Ray Diffraction (XRD) analysis and Scanning Electron Microscope-Energy Dispersive X-ray Spectroscopy (SEM-EDS) is then conducted. The XRD result shows the amount of NdFeB content in the NdFeB-type permanent magnet is increased after heat treatment. The more significant amount of NdFeB content causes higher coercivity. The maximum coercivity, 19 kOe, is achieved at 850 °C of heat treatment temperature, where the NdFeB content is at the highest amount. Microstructural characterizations using SEM-EDS show that at 850 °C of heat treatment temperature, the iron (Fe) content in the grain boundaries is the lowest. It causes higher coercivity. This is due to the magnetically decoupled between NdFeB grains. The decoupling magnet of the NdFeB grains is affected by the Fe content in the grain boundaries. High-temperature heat treatment at 900 and 1050 °C led to the decomposition of NdFeB content in the grains and increased the Fe content in the grain boundaries, which resulted in a substantial reduction of magnetic coercivity.Eva AfrilindaDagus Resmana DjuandaShinta VirdhianMartin DoloksaribuMoch Iqbal Zaelana MuttaharSri Bimo PratomoDepartment of Chemistry, Universitas Gadjah Madaarticlendfebheat treatmentcoercivitymagnetically decoupleddecomposedChemistryQD1-999ENIndonesian Journal of Chemistry, Vol 21, Iss 3, Pp 626-634 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	ndfeb heat treatment coercivity magnetically decoupled decomposed Chemistry QD1-999
spellingShingle	ndfeb heat treatment coercivity magnetically decoupled decomposed Chemistry QD1-999 Eva Afrilinda Dagus Resmana Djuanda Shinta Virdhian Martin Doloksaribu Moch Iqbal Zaelana Muttahar Sri Bimo Pratomo Morphology of NdFeB-Type Permanent Magnet Coercivity Enhancement by Heat Treatment Process
description	To understand the morphology of the coercivity enhancement by heat treatment, a commercial sintered NdFeB-type permanent magnet is annealed, and the coercivity is measured by Permagraph. It is shown that the coercivity is increased compared to the initial. Observation by X-Ray Diffraction (XRD) analysis and Scanning Electron Microscope-Energy Dispersive X-ray Spectroscopy (SEM-EDS) is then conducted. The XRD result shows the amount of NdFeB content in the NdFeB-type permanent magnet is increased after heat treatment. The more significant amount of NdFeB content causes higher coercivity. The maximum coercivity, 19 kOe, is achieved at 850 °C of heat treatment temperature, where the NdFeB content is at the highest amount. Microstructural characterizations using SEM-EDS show that at 850 °C of heat treatment temperature, the iron (Fe) content in the grain boundaries is the lowest. It causes higher coercivity. This is due to the magnetically decoupled between NdFeB grains. The decoupling magnet of the NdFeB grains is affected by the Fe content in the grain boundaries. High-temperature heat treatment at 900 and 1050 °C led to the decomposition of NdFeB content in the grains and increased the Fe content in the grain boundaries, which resulted in a substantial reduction of magnetic coercivity.
format	article
author	Eva Afrilinda Dagus Resmana Djuanda Shinta Virdhian Martin Doloksaribu Moch Iqbal Zaelana Muttahar Sri Bimo Pratomo
author_facet	Eva Afrilinda Dagus Resmana Djuanda Shinta Virdhian Martin Doloksaribu Moch Iqbal Zaelana Muttahar Sri Bimo Pratomo
author_sort	Eva Afrilinda
title	Morphology of NdFeB-Type Permanent Magnet Coercivity Enhancement by Heat Treatment Process
title_short	Morphology of NdFeB-Type Permanent Magnet Coercivity Enhancement by Heat Treatment Process
title_full	Morphology of NdFeB-Type Permanent Magnet Coercivity Enhancement by Heat Treatment Process
title_fullStr	Morphology of NdFeB-Type Permanent Magnet Coercivity Enhancement by Heat Treatment Process
title_full_unstemmed	Morphology of NdFeB-Type Permanent Magnet Coercivity Enhancement by Heat Treatment Process
title_sort	morphology of ndfeb-type permanent magnet coercivity enhancement by heat treatment process
publisher	Department of Chemistry, Universitas Gadjah Mada
publishDate	2020
url	https://doaj.org/article/4259d04ab73949b6923f02107ae9009d
work_keys_str_mv	AT evaafrilinda morphologyofndfebtypepermanentmagnetcoercivityenhancementbyheattreatmentprocess AT dagusresmanadjuanda morphologyofndfebtypepermanentmagnetcoercivityenhancementbyheattreatmentprocess AT shintavirdhian morphologyofndfebtypepermanentmagnetcoercivityenhancementbyheattreatmentprocess AT martindoloksaribu morphologyofndfebtypepermanentmagnetcoercivityenhancementbyheattreatmentprocess AT mochiqbalzaelanamuttahar morphologyofndfebtypepermanentmagnetcoercivityenhancementbyheattreatmentprocess AT sribimopratomo morphologyofndfebtypepermanentmagnetcoercivityenhancementbyheattreatmentprocess
_version_	1718378983804895232

Morphology of NdFeB-Type Permanent Magnet Coercivity Enhancement by Heat Treatment Process

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