Significant coercivity enhancement of hot deformed NdFeB magnets by doping Ce-containing (PrNdCe)70Cu30 alloys powders

Chang, H. W.; Lee, Y.I.; Liao, P.H.; Chang, W.C.

doi:10.1016/j.scriptamat.2017.11.052

Cited by 41 publications

(6 citation statements)

References 29 publications

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“…-традиционное легирование тяжелыми редкоземельными элементами (РЗЭ), такими как Dy и Tb [1]; -межзерновое сложение (intergranular addition) [2]; -диффузия по границам зерен [3][4][5]. Как показал проведенный обзор, в настоящее время стремятся отказаться от первого способа улучшения свойств постоянных магнитов.…”

Section: актуальные исследования в области производства постоянных ма...unclassified

“…Таким образом, разработан способ повышения коэрцитивной силы горячих деформированных магнитов NdFeB без использования более дорогих тяжелых редкоземельных элементов. [2] Использование процесса диффузии по границам зерен (GBDP) -нанесение тонкой пленки DyZn на поверхность спеченного магнита NdFeB для улучшения коэрцитивной силы и тепловой стабильности Пленку DyZn на поверхности спеченного магнита NdFeB наносили методом магнетронного распыления постоянного тока. В результате достигнуто значительное увеличение коэрцитивной силы (с 1174,1 до 1711,4 кА/м) при небольшом снижении остаточного напряжения (с 1,20 до 1,19 Тл).…”

Section: актуальные исследования в области производства постоянных ма...unclassified

“…Для печатных магнитов NdFeB следующей целью будет попытка формирования микроструктуры путем направленной кристаллизации. Поэтому в последние годы большинство работ посвящены исследованиям двух других способов создания высокоэффективных магнитов -межзернового сложения (intergranular addition) [2] и диффузии по границам зерен [3][4][5].…”

Section: актуальные исследования в области производства постоянных ма...unclassified

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Topical trends in the application of rare-earth metals and their compounds in the production of magnetic and luminescent materials

Baranovskaya

Karpov

Petrova

et al. 2020

Izv.VUZ. Tsvet. Met.

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This review is devoted to the review of current trends in the use of rare-earth metals (REM) in two major scientific and technical fields – the production of magnetic and luminescent materials. The reviews show that it is REM that gives this product unique properties. The information on the content of matrix and alloying components, their influence on achieving the required characteristics of the most popular magnetic materials is systematized. The prospects of new combinations of rare-earth metals in the further progress of the production of magnetic materials for various purposes are shown. Along with the traditional cobalt-samarium and neodymium-iron-boron compositions, new magnetic materials with increased hysteresis properties and temperature-time stability have been developed, phases with variable valence have been synthesized, which are used as memory elements in information systems. The article also reviews and summarizes the results of studies in another important area of REM application – the creation of luminescent materials. Phosphors based on compounds of rare earth metals are used in the production of high-pressure mercury lamps with improved characteristics, X-ray screens, high and low pressure fluorescent lamps, screens for electron-optical converters. Narrow-band phosphors based on REM compounds are of interest for lamps used in plant growing, especially for areas with a cold climate, where year-round plant growth is possible only with the use of additional radiation sources.The trends in the synthesis of luminescent materials using various rare-earth metals and their combinations are revealed. Attention is turned to the need to use chemically pure precursors of rare-earth metals in the creation of such materials. The prospects of creating nanophosphors, as well as the improvement of synthesis methods and diagnostic methods, are noted.

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Section: актуальные исследования в области производства постоянных ма...unclassified

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Topical trends in the application of rare-earth metals and their compounds in the production of magnetic and luminescent materials

Baranovskaya

Karpov

Petrova

et al. 2020

Izv.VUZ. Tsvet. Met.

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show abstract

“…Bu durum dikkate alındığında, başta manyetik koerzivite olmak üzere kalıcı manyetik özellikleri iyileştiren çeşitli proseslerin kullanılması gerektiği sonucuna ulaşılmaktadır [6]. Uygun üretim yönteminin seçimi, ısıl işlem, tane sınırı difüzyonu prosesi (GBDP), alaşımlama bu prosesler arasında yer almaktadır [6][7][8][9][10]. Hızlı katılaştırma yöntemlerinden birisi olan ergiyik eğirme prosesi ile oldukça yüksek soğutma hızları kullanılarak amorf ve nispeten ince tane dağılımına sahip bir mikroyapı ve sonuç olarak, üstün manyetik özelliklere ulaşmak mümkündür [11][12][13][14].…”

Section: Introductionunclassified

Effect of heat treatment time on magnetic properties of NdFeB-based permanent magnetic alloys

Yılmaz¹,

Akgül²

2022

EJOSAT

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In our current study, NdFeB-based permanent magnet ribbon alloys were produced by using melt spinning method, which is one of the rapid solidification methods and very common in the production of ribbon-shaped, amorphous and/or semi-crystalline alloys. During the production of each NdFeB alloy, 15 wt.% of waste magnet was included in the composition of the alloys. The produced permanent magnet alloys were heat treated for 5 and 10 minutes by using a heat treatment temperature of 710 °C and very high heating and cooling rates of 285 K/s. The effect of the heat treatment time applied at the same temperature on the magnetic properties of the strip alloys was investigated. While the increase in heat treatment time resulted in a remarkable change in magnetic coercivity and maximum energy product properties, there was not much change in the properties such as saturation magnetization and magnetic remenance. As clearly seen, increasing heat treatment time resulted in a continuous decrease in magnetic coercivity from 5030.5 Oe to 2279.4 Oe, maximum energy product first showed a dramatic increase from 62.02 kJ/m3 to 103.73 kJ/m3, and then a dramatic decrease to 38.63 kJ/m3, indicating a decrease in the permanent magnetism of the alloy.

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“…NdFeB rare-earth permanent magnets are valued by industry because of their high magnetic properties, more abundant raw material reserves, lower cost, and are widely applied in many fields, such as consumer electronics, industrial motors, electric vehicles, wind power generation, computer hard disk technology, aerospace, magnetic levitation technology, nuclear magnetic resonance imaging, magnetic transmission fields, as well as new energy vehicles [1][2][3] . The most mainstream preparation process is sintered NdFeB, where the alloy ingot is made into strip casting pieces by melt jetting, followed by hydrogen decrepitation, jet milling and powder mixing processes to obtain a powder of about 3.5 μm, which is pressed by magnetic field orientation and finally sintering and tempering to obtain dense magnets [4] .…”

Section: Introductionmentioning

confidence: 99%

Removal of non-magnetic impurities on the surface of NdFeB magnets

Ren

et al. 2022

J. Phys.: Conf. Ser.

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NdFeB rare earth permanent magnets are widely applied in numerous fields including consumer electronics, industrial motors and new energy vehicles. Sintered NdFeB magnets are prepared by pressing and high-temperature sintering, followed by machining into desired shapes with anisotropism and high magnetic properties. During industrial production process, the appearance of non-magnetic impurities adhering on NdFeB magnet surface is a critical problem, which takes bad influences to not only magnetic properties of NdFeB, but also the qualification rate of subsequent assembled parts. There are two forms of impurities, one is gelatinous and the other is filamentary. In this paper, non-magnetic impurities on the surface of NdFeB magnets were characterized and analyzed by FTIR, EDS and SEM, and the methods to remove impurities were studied. The results showed that gelatinous impurities are stearamide derivative, which can be dissolved by xylenes under heating conditions. Filamentous impurities are cellulose derivative that can be removed by economical sodium hydroxide-urea system instead of expensive AmimCl, without damaging magnet plating and magnetic properties.

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Significant coercivity enhancement of hot deformed NdFeB magnets by doping Ce-containing (PrNdCe)70Cu30 alloys powders

Cited by 41 publications

References 29 publications

Topical trends in the application of rare-earth metals and their compounds in the production of magnetic and luminescent materials

Topical trends in the application of rare-earth metals and their compounds in the production of magnetic and luminescent materials

Effect of heat treatment time on magnetic properties of NdFeB-based permanent magnetic alloys

Removal of non-magnetic impurities on the surface of NdFeB magnets

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