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Relevant bibliographies by topics / Neodymium-iron-boron magnets

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Academic literature on the topic 'Neodymium-iron-boron magnets'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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Journal articles on the topic "Neodymium-iron-boron magnets"

1

Croat, J. J., and J. F. Herbst. "Rapidly Solidified Neodymium-Iron-Boron Magnets." MRS Bulletin 13, no. 6 (1988): 37–40. http://dx.doi.org/10.1557/s0883769400065489.

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Permanent magnets have long occupied an important position in technology. Among the multitude of products using permanent magnets are televisions, telephones, computers, videocassette recorders, audio systems, household appliances, and perhaps surprisingly to many consumers, automobiles. Figure 1 illustrates the numerous magnet applications in a modern passenger vehicle. These applications include an array of dc electric motors such as the starter, heater and air conditioner blower, windshield wiper, window lift, door lock, and fuel pump motors. A fully equipped car can have more than 30 dc electric motors. Other uses include actuators, gauges, and sensors. In all these examples higher performance magnetic materials may afford the advantages of increased operating efficiency and reduction in size and weight.One performance index or figure of merit for a permanent magnet is the energy product (BH)max, the maximum product of magnetic induction B and applied field H in the second quadrant of the B-H hysteresis curve. The so-called theoretical (BH)max, the highest energy product realizable in principle, is simply given by (4πMs)2/4, where Ms is the saturation magnetization. Progress in the development of technologically significant hard magnets has been monitored generally by improvements in (BH)max. For many years three types of materials were of commercial importance, namely, alnico, ferrite, and samarium-cobalt alloys based on either the SmCo5 or Sm2Co17 intermetallic compounds. Of these the Sm-Co magnets offer the largest energy products, on the order of 20 MGOe.

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2

Bondemark, Lars, Jüri Kurol, and Alf Wennberg. "Orthodontic Rare Earth Magnets—In Vitro Assessment of Cytotoxicity." British Journal of Orthodontics 21, no. 4 (1994): 335–41. http://dx.doi.org/10.1179/bjo.21.4.335.

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The aim of this study was to assess and compare in vitro the cytotoxic effects of uncoated and parylene-coated rare earth magnets, used in orthodontics. Cytotoxicity of samarium-cobalt magnets (SmCo5 and Sm2Co17) and neodymium-iron-boron magnets (Nd2Fe14B) was assessed by two in vitro methods, the millipore filter method and an extraction method. Orthodontic stainless steel brackets served as controls. Uncoated SmCo5-magnets showed high cytotoxicity while uncoated Sm2Co17-magnets demonstrated moderate cytotoxicity. Uncoated neodymium-iron-boron magnets, as well as parylene coated Sm2Co17-magnets and parylene-coated neodymium-iron-boron magnets, showed negligible cytotoxicity. Short-term exposure to a static magnetic field did not cause any cytotoxic effect on the cells.

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3

Herbst, J. F., and J. J. Croat. "Neodymium-iron-boron permanent magnets." Journal of Magnetism and Magnetic Materials 100, no. 1-3 (1991): 57–78. http://dx.doi.org/10.1016/0304-8853(91)90812-o.

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4

Lee, R. W. "Hot‐pressed neodymium‐iron‐boron magnets." Applied Physics Letters 46, no. 8 (1985): 790–91. http://dx.doi.org/10.1063/1.95884.

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5

Stewart, Seán M. "Some simple demonstration experiments involving homopolar motors." Revista Brasileira de Ensino de Física 29, no. 2 (2007): 275–81. http://dx.doi.org/10.1590/s0102-47442007000200012.

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The ready availability of very strong permanent magnets in the form of rare-earth magnetic alloys such as neodymium-iron-boron has lead to renewed interest in one of the oldest types of electric motors - the homopolar motor. The ease with which a demonstration homopolar motor can now be built and operated when neodymium magnets are used is quite remarkable. In this paper some simple homopolar motors employing neodymium magnets suitable for demonstrational purposes are described and discussed.

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6

Palomo, Roberto Eduardo Quintal, and Maciej Gwozdziewicz. "Effect of Demagnetization on a Consequent Pole IPM Synchronous Generator." Energies 13, no. 23 (2020): 6371. http://dx.doi.org/10.3390/en13236371.

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The design and analysis of a permanent magnet synchronous generator (PMSG) are presented. The interior permanent magnet (IPM) rotor was designed asymmetric and with the consequent pole approach. The basis for the design was a series-produced three-phase induction motor (IM) and neodymium iron boron (Nd-Fe-B) cuboid magnets were used for the design. For the partial demagnetization analysis, some of the magnets were extracted and the results are compared with the finite element analysis (FEA).

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7

HERBST, J. F., and J. J. CROAT. "ChemInform Abstract: Neodymium-Iron-Boron Permanent Magnets." ChemInform 23, no. 22 (2010): no. http://dx.doi.org/10.1002/chin.199222315.

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8

Sandler, P. J., and S. D. Springate. "Unerupted Premolars—An Alternative Approach." British Journal of Orthodontics 18, no. 4 (1991): 315–21. http://dx.doi.org/10.1179/bjo.18.4.315.

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9

Hadjipanayis, G. C., K. R. Lawless, and R. C. Dickerson. "Magnetic hardening in iron‐neodymium‐boron permanent magnets." Journal of Applied Physics 57, no. 8 (1985): 4097–99. http://dx.doi.org/10.1063/1.334630.

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10

Imashuku, Susumu, Kazuaki Wagatsuma, and Jun Kawai. "Scanning Electron Microscope-Cathodoluminescence Analysis of Rare-Earth Elements in Magnets." Microscopy and Microanalysis 22, no. 1 (2016): 82–86. http://dx.doi.org/10.1017/s1431927615015676.

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AbstractScanning electron microscope-cathodoluminescence (SEM-CL) analysis was performed for neodymium–iron–boron (NdFeB) and samarium–cobalt (Sm–Co) magnets to analyze the rare-earth elements present in the magnets. We examined the advantages of SEM-CL analysis over conventional analytical methods such as SEM-energy-dispersive X-ray (EDX) spectroscopy and SEM-wavelength-dispersive X-ray (WDX) spectroscopy for elemental analysis of rare-earth elements in NdFeB magnets. Luminescence spectra of chloride compounds of elements in the magnets were measured by the SEM-CL method. Chloride compounds were obtained by the dropwise addition of hydrochloric acid on the magnets followed by drying in vacuum. Neodymium, praseodymium, terbium, and dysprosium were separately detected in the NdFeB magnets, and samarium was detected in the Sm–Co magnet by the SEM-CL method. In contrast, it was difficult to distinguish terbium and dysprosium in the NdFeB magnet with a dysprosium concentration of 1.05 wt% by conventional SEM-EDX analysis. Terbium with a concentration of 0.02 wt% in an NdFeB magnet was detected by SEM-CL analysis, but not by conventional SEM-WDX analysis. SEM-CL analysis is advantageous over conventional SEM-EDX and SEM-WDX analyses for detecting trace rare-earth elements in NdFeB magnets, particularly dysprosium and terbium.

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