scholarly journals Microstructure and composition in rapidly quenched NdFeB-based hard magnet alloys

1996 ◽  
Vol 79 (8) ◽  
pp. 4848 ◽  
Author(s):  
Tai D. Nguyen ◽  
Kannan M. Krishnan ◽  
Laura Henderson Lewis ◽  
Yimei Zhu ◽  
David O. Welch
Keyword(s):  
Hard Magnet

scholarly journals Ferrite-based soft and hard magnetic structures by extrusion free-forming

RSC Advances ◽  
2017 ◽  
Vol 7 (43) ◽  
pp. 27128-27138 ◽  
Author(s):  
Erwin Peng ◽  
Xiangxia Wei ◽  
Tun Seng Herng ◽  
Ulf Garbe ◽  
Dehong Yu ◽  
...  
Keyword(s):  
Forming Process ◽  
Magnetic Structures ◽  
Hard Magnet

Simple fabrication of a ferrite-based bulk soft magnet (NiFe2O4) and hard magnet (BaFe12O19) using the extrusion free-forming process.

New Fe-Cr-Mo glass-sealable semi-hard magnet alloys for remanent reed contacts

1982 ◽  
Vol 18 (6) ◽  
pp. 1454-1456 ◽  
Author(s):  
S. Jin ◽  
T. Tiefel ◽  
J. Bennett ◽  
W. Archer
Keyword(s):  
Hard Magnet

The Development of the Traction Drive Mechanism Made of the Plastic Magnet

2003 ◽  
Author(s):  
Akira Shoji ◽  
Giichi Kawashima
Keyword(s):  
Magnetic Induction ◽  
Ferrite Powder ◽  
Traction Drive ◽  
Drive Mechanism ◽  
Hard Magnet ◽  
The One ◽  
The Cost ◽  
Outside Diameter ◽  
As If

This paper is the one that it was described to have developed the traction drive by using the plastic hard magnet. The plastics material was used to research by the following reasons. The plastics material can mold it. As a result, it processes complex and it is possible to make it to the magnet. In addition, it is possible to mass-produce, it is light, and it is also possible that the miniaturization reduces possible and the cost. Next, the mechanism of the traction drive is described. It rotates by being circumscribed by non-contact, and inscribing two plastic hard rings as if the gear. N pole and S pole are divided equally in the direction of the circumference of the ring. It becomes by these as if the match of the god with teeth and teeth. These devices are commonly called “Gear without teeth”. Some doughnut disks with a different outside diameter were produced. Each disk is made magnetism. Each disk was set, and assembled to one disk. The disk is molded with the plastic hard. The plastics material used the one that the ferrite powder was mixed with the polyacetal resin. Making to magnetism is possible by the magnetization technology. The mechanism, molding, making to magnetism, and the magnetic induction, etc. were examined in the experiment. The development of non-contact made of plastic hard traction drive device was proven to be possible by this research.

Bulk metallic glass formation, composite, and magnetic propertiesof Fe-B-Nd based alloys

2009 ◽  
Vol 24 (2) ◽  
pp. 357-371 ◽  
Author(s):  
J. Zhang ◽  
Y.P. Feng ◽  
Y. Li
Keyword(s):  
Glass Formation ◽  
Magnetic Phase ◽  
Industrial Applications ◽  
Maximum Energy ◽  
Quaternary Alloys ◽  
Maximum Energy Product ◽  
Energy Product ◽  
Hard Magnets ◽  
Hard Magnet ◽  
Hard Magnetic Properties

The glass formation in Fe-rich ternary Fe-B-Nd and quaternary (Fe,B,Nd)96Nb4 alloys has been studied and the best ternary and quaternary glass formers are located at Fe67B23Nd10 and (Fe68B25Nd7)Nb4 with critical diameters of 1 and 4 mm, respectively. For (Fe,B,Nd)96Nb4 alloys, the competing phases with glass were identified by monitoring the microstructure change. Fe14Nd2B was discovered to be one competing phase, which is the principle magnetic phase for Nd-Fe-B hard magnets. Composites with uniformly distributed Fe14Nd2B were formed for quaternary alloys with a diameter of 1.5 to 3 mm. Bulk hard magnets could be obtained by directly annealing the composites in a compositional area. A hard magnet with a coercivity of 1,100 kAm−1 and a maximum energy product, (BH)max, of 33 kJm–3 was obtained at (Fe67B23Nd10)96Nb4 by annealing. The combination of hard magnetic properties and the large critical sample size may make these alloys a commercially viable candidate for industrial applications.

scholarly journals Efek Penambahan Fe3Mn7 Terhadap Sifat Fisis dan Mekanik α-Fe2O3

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Eko Arief Setiadi
Keyword(s):  
Magnetic Properties ◽  
Bulk Density ◽  
Major Phase ◽  
Magnetization Saturation ◽  
Hard Magnet ◽  
Saturation Remanence ◽  
Optimum Sample

Abstrak: Preparasi dan karakterisasi pellet α-Fe2O3 dengan penambahan 0, 2, 5 dan 10 %wt. Fe3Mn7 berbasis pada materialalam telah berhasil dilakukan. Proses pencampuran serbuk α-Fe2O3 dan Fe3Mn7 dilakukan dengan menggunakan HEM. ºKemudian campuran serbuk dikasinasi pada suhu 1000C, dikompaksi pada 69 Pa hingga menjadi pellet dan disinter padasuhu 1000 ºC. Karakterisasi XRD menunjukkan adanya fasa dominan α-Fe2O3 dan fasa baru MnO2 dan Fe3O4. Densitas dankekerasan sampel meningkat secara linier seiring dengan kenaikan komposisi Fe3Mn7 yang ditambahkan. Sampel optimum3diperoleh pada sampel α-Fe2O3/10 %wt. Fe3Mn7 dengan nilai bulk density dan kekerasan masing-masing 4,98 g/cm and994,94 HV. Sampel ini termasuk dalam klasifikasi hard magnet dengan nilai magnetisasi saturasi, remanen dan koersivitasmasing-masing sebesar 24,0 emu/g, 10,3 emu/g dan 571,8 Oe.Kata kunci:. α-Fe2O3, Fe3Mn7, densitas, kekerasan, sifat magnetikAbstract: Preparation and characterization of α-Fe2O3 pellet with the addition of 0, 2, 5 and 10 %wt. Fe3Mn7 based on naturalmaterials have been successfully carried out. The process of mixing powder of α-Fe2O3 and Fe3Mn7 was performed usingºHEM. Then, the mix powders were calcined at temperature of 1000 C. After that, the powders were compacted at 69 Pa intopellet and sintered at temperature of 1000ºC. Characterization of XRD shows that the samples have major phase of α-Fe2O3and new phases of MnO2 and Fe3O4. The density and hardness samples increase linearly with increasing of Fe3Mn73composition. The optimum sample with α-Fe2O3/10 %wt. Fe3Mn7 has bulk density and hardness value of 4.98 g/cm and 994.94HV respectively. This sample is classified as semi-hard magnet with magnetization saturation, remanence and coercivity valueof 24.0 emu/g, 10.3 emu/g dan 571.8 Oe respectively.Keywords: α-Fe2O3, Fe3Mn7, density, hardness, magnetic properties

scholarly journals Analysis and Modeling of Attractive Force Using an Electropermanent Magnet and Electromagnetic in a Novel Wobble Gripper

Actuators ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 116
Author(s):  
Sang Yong Park ◽  
Dongyoung Lee ◽  
Buchun Song ◽  
Yoon Su Baek
Keyword(s):  
Finite Element ◽  
Magnetic Circuit ◽  
Attractive Force ◽  
Force Model ◽  
Finite Element Analyses ◽  
Attraction Force ◽  
Neodymium Magnet ◽  
Straightforward Method ◽  
Hard Magnet ◽  
Straight Lines

An electropermanent magnet (EM) can be fixed or rotated without applying the additional power of a wobble motor. This consists of a neodymium magnet and semi-hard magnet. A model to design a wobble motor for a wobble gripper without finite element analyses and to predict the attraction force according to the permanent magnet and current is necessary. In this paper, a force model is derived using distribution parameter and magnetic circuit analyses, including flux loss and fringing effects. It is not easy to design a complete magnetic circuit model considering the loss effects, but it can be constructed using a relatively straightforward method that simplifies the paths of leaked fluxes into arcs and straight lines. The model was verified by comparing the results of finite element analyses with measurements of two prototypes using internal and external fixed cases. The model properly predicts the attractive force between the rotor and stator and can be used in the initial design of a gripper that holds or rotates with the electropermanent magnet.

Formation of Nanoparticles of ε-Fe2O3from Yttrium Iron Garnet in a Silica Matrix:  An Unusually Hard Magnet with a Morin-Like Transition below 150 K

2005 ◽  
Vol 17 (5) ◽  
pp. 1106-1114 ◽  
Author(s):  
Mohamedally Kurmoo ◽  
Jean-Luc Rehspringer ◽  
Alzbeta Hutlova ◽  
Céline D'Orléans ◽  
Serge Vilminot ◽  
...  
Keyword(s):  
Yttrium Iron Garnet ◽  
Silica Matrix ◽  
Yttrium Iron ◽  
Hard Magnet ◽  
Iron Garnet

scholarly journals Hard-Magnet L10-CoPt Nanoparticles Advance Fuel Cell Catalysis

Joule ◽  
2019 ◽  
Vol 3 (1) ◽  
pp. 124-135 ◽  
Author(s):  
Junrui Li ◽  
Shubham Sharma ◽  
Xiaoming Liu ◽  
Yung-Tin Pan ◽  
Jacob S. Spendelow ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Hard Magnet ◽  
L10 Copt Nanoparticles
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