A study of high-energy milling for the production of sintered PrFeB magnets

Périgo, E.A.; Soares, Edson Pereira; Neto, Ricardo Mendes Leal; Motta, C.C.; Faria, Rubens Nunes de

doi:10.1590/s1516-14392007000300018

Cited by 7 publications

(9 citation statements)

References 9 publications

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“…As curvas de desmagnetização dos ímãs produzidos são apresentadas na No caso dos ímãs produzidos com 30 minutos de moagem, este "joelho" pode ter sua origem na heterogeneidade do tamanho de partícula devido ao tempo insuficiente de moagem, produzindo uma distribuição de grãos muito ampla [37][38][39][40].…”

Section: Caracterização Magnéticaunclassified

“…Outro fator é a própria granulometria no pó produzido, que não é adequada à temperatura de sinterização, favorecendo o fenômeno de crescimento anormal de grãos, produzindo também uma distribuição muito ampla de diâmetros de grãos. [37][38][39][40].…”

Section: Caracterização Magnéticaunclassified

“…Intervalos insuficientes de moagem podem não reduzir o tamanho de partícula ideal para a sinterização [37][38][39][40]. .…”

Section: Densidadeunclassified

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Influência dos parâmetros de processamento na microestrutura e nas propriedades magnéticas de ímãs permanentes de (Nd,Pr)FeB

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Section: Caracterização Magnéticaunclassified

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Influência dos parâmetros de processamento na microestrutura e nas propriedades magnéticas de ímãs permanentes de (Nd,Pr)FeB

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“…Apesar das melhorias, há uma mudança pequena nos valores de remanência e produto de energia máximo. Estudos de Périgo e colaboradores, 2007, mostrou que houve um aumento de 4,35% no Br e um aumento de 8,6% no (BH) max, para moagens de 60 min [48].…”

Section: Influência Do Tempo De Moagemunclassified

“…[3] ELLIOT, R. The story of magnetism. Physics A, v. 384, pg [44][45][46][47][48][49][50][51][52] . 2007.…”

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Influência do disprósio nas propriedades magnéticas dos ímãs permanentes à base de NdFeB obtidos por HD

Faria

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FARIA, Marcela E. M. Dysprosium influence on magnetic properties of NdFeB-based permanent magnets obtained by HD. 2022. 84 p. Dissertation (Master in Nuclear Technology) -Institute of Energetic and Nuclear Research, -IPEN/CNEN/SP. São Paulo.The rare-earth magnets were showed important in the development of electromagnetic devices. However, these magnets had promoted advances, the low Curie temperature prevent its usage in high temperatures. It's known that the dysprosium addition improves the magnetic properties, control the grain size, and raise the working temperature. The current research focus on minimizing the quantity of dysprosium used in the magnets. A rich dysprosium alloy was produced in the Technological Institute Research (IPT) to be used as additive in the magnetic alloys (Nd14,1B6,1Febal and Nd8,7Dy4,9B6,1Febal), acquired with Less Common Metal Ltd. Although these alloys after an X-ray analyzes, was determined the presence of free iron, that's deleterious for the magnetic properties. It was necessary to realize a heat treatment to eliminate the Fe-α. This present dissertation analyzes the influence of dysprosium variation within the magnets (0%, 10%, 20% e 30%) and evaluate the variation of processing parameters, like the time of the heat treatment (without heat treatment, 2.5h and 5h) and the milling time (45 min, 53 min and 60 min). The variation had the object to investigate which variation would provide better grain sizes for the sinterization and the magnetic properties. Better results were obtained for heat treatment of 5h, milled for 60 min and 10%w of Dy; obtained iHc = 736 k.A.m -1 , Jr = 1.18 T and BHmax = 4.32 k.J.m -3 .

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Rational Design of Nanosized Light Elements for Hydrogen Storage: Classes, Synthesis, Characterization, and Properties

Lai

Wang

Sun

et al. 2018

Adv Materials Technologies

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Hydrogen is often considered as a technology for the future owing to the limitations of current hydrogen storage materials in powering fuel cell vehicles. However, with the first hydrogen vehicles on the road and the need for better energy storage systems to back-up the increasing penetration of renewables, hydrogen based technologies will undoubtedly play an ever-increasing role in future energy schemes. To support the uptake of hydrogen, the challenge is to design better materials than This article is protected by copyright. All rights reserved. 2 the ones currently available. This means materials capable of reversible hydrogen uptake and release close to the ambient and with a storage capacity approaching 10 wt%. To date, materials with high hydrogen capacity are known but the lack of approaches to fully control the properties of these materials toward the targets for practical application still remains the drawback. In this context, the approach of particle size reduction or nanosizing has recently emerged as a potential mean to gain full control over the properties of high capacity hydride materials. This review aims to summarise current understanding toward the synthesis of nanomaterials and the potential of current knowledge to aid with the synthesis of nanosized hydrides with properties that could ultimately enable hydrogen storage at the ambient.

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A study of high-energy milling for the production of sintered PrFeB magnets

Cited by 7 publications

References 9 publications

Influência dos parâmetros de processamento na microestrutura e nas propriedades magnéticas de ímãs permanentes de (Nd,Pr)FeB

Influência dos parâmetros de processamento na microestrutura e nas propriedades magnéticas de ímãs permanentes de (Nd,Pr)FeB

Influência do disprósio nas propriedades magnéticas dos ímãs permanentes à base de NdFeB obtidos por HD

Rational Design of Nanosized Light Elements for Hydrogen Storage: Classes, Synthesis, Characterization, and Properties

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