Influence of Different Temperatures on Hydrogen Decrepitation of Scrap Hard Disk Drive NdFeB Magnets

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dc.authorid0009-0003-4196-3591
dc.authorid0000-0002-0826-7880
dc.contributor.authorKAPLAN, Cansu
dc.contributor.authorKAPLAN, Gizem
dc.contributor.authorÇAKIR, Öznur
dc.date.accessioned2026-01-28T11:57:01Z
dc.date.available2026-01-28T11:57:01Z
dc.date.issued2026-01-15
dc.departmentTENMAK-Nadir Toprak Elementleri Araştırma Enstitüsü
dc.description.abstractDemand for rare earth elements (REEs) in NdFeB permanent magnets used in wind energy and EV necessitates efficient recycling to address supply chain vulnerabilities and environmental concerns. Hydrogen decrepitation (HD), hydrogen-assisted decrepitation process, offers a promising method for processing end-of-life Hard Disk Drive (HDD) NdFeB magnets by converting them into demagnetised powders while preserving microstructural integrity. This study investigates the impact on hydrogenation temperature (room temperature, 50°C, 75°C) on the recycling process at 4 bar hydrogen pressure and 2 hours. Chemical composition was determined by ICP-OES, oxygen and hydrogen contents by LECO analysis, phase identification by XRD with Rietveld refinement, and microstructure by SEMEDS. Results indicate that reduced temperatures promote hydrogen absorption, diminish oxidation, and produce finer particles characterised by typical intergranular fractures. XRD confirmed the formation of Nd₂Fe₁₄BHₓ phases with decreasing hydrogen content at elevated temperatures, along with an increased presence of Nd₂O₃ due to the exposure of reactive surfaces. According to these results, HD at room temperature under 4 bar is optimal for the effective and sustainable recycling of NdFeB magnets, eliminating the need for further heat treatment.
dc.identifier.urihttps://kurumsalarsiv.tenmak.gov.tr/handle/20.500.12878/2091
dc.institutionauthorKAPLAN, Cansu
dc.institutionauthorKAPLAN, Gizem
dc.institutionauthorÇAKIR, Öznur
dc.language.isoen
dc.publisherTurkish Energy, Nuclear and Mineral Research Agency (TENMAK)
dc.relation.journalUluslararası Bor Sempozyumu
dc.subjectHydrogen Decrepitation
dc.subjectNdFeB Magnets
dc.titleInfluence of Different Temperatures on Hydrogen Decrepitation of Scrap Hard Disk Drive NdFeB Magnets
dc.typeconferenceObject
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