Axial Pressing Method Using Pulse Magnetizing Field for the Preparation of Nd-Fe-B Sintered Magnets

2004 ◽  
Vol 449-452 ◽  
pp. 505-508 ◽  
Author(s):  
Dong Hwan Kim ◽  
Andrew S. Kim ◽  
Sang Myun Kim ◽  
Tae Suk Jang
Keyword(s):  
Pulse Field ◽  
Magnetic Alignment ◽  
Sintered Magnet ◽  
Pressing Method ◽  
Sintered Magnets ◽  
Die Pressing ◽  
Pulse Supply ◽  
Magnetizing Field

A new axial pressing method using pulse magnetizing field was studied to improve the remanence of Nd-Fe-B sintered magnets. In pulsed axial die pressing(PADP) process , tapping density of powders, method of pulse supply and strength of pulse field were optimized to increase magnetic alignment and remanence. As a results, we could find that an axial pressing under pulse magnetizing field was very effective to increase the degree of magnetic alignment of powder, yielding remanences even higher than those obtained by the transverse die pressing. The remanence of 14.1 kG was easily obtained by PADP process from 31R-68TM-1B (in wt.%) sintered magnet

scholarly journals Axial Pressing Method Using Pulse Magnetizing Field for the Preparation of Nd-Ee-B Sintered Magnets

2003 ◽  
Vol 13 (4) ◽  
pp. 182-186
Author(s):  
Dong-Hwan Kim ◽  
Byung-Kil Kang ◽  
Dong-Youl Jang ◽  
Andrew S. Kim ◽  
Sang-Myun Kim ◽  
...  
Keyword(s):  
Pressing Method ◽  
Sintered Magnets ◽  
Magnetizing Field

Magnetic alignment improvement of Nd-Fe-B sintered magnets by a new axial pulse pressing method

2004 ◽  
Vol 201 (8) ◽  
pp. 1909-1912
Author(s):  
Donghwan Kim ◽  
Andrew S. Kim ◽  
Sangmyun Kim
Keyword(s):  
Magnetic Alignment ◽  
Pressing Method ◽  
Sintered Magnets

High orientation Nd-Fe-B sintered magnets prepared by wet pressing method

2020 ◽  
Vol 495 ◽  
pp. 165826
Author(s):  
Shuai Cao ◽  
Xiaoqian Bao ◽  
Jiheng Li ◽  
Haijun Yu ◽  
Kunyuan Zhu ◽  
...  
Keyword(s):  
Pressing Method ◽  
Sintered Magnets ◽  
Wet Pressing ◽  
High Orientation

scholarly journals Analysis of the applicability of die pressing method for ring-shaped parts fabrication

2018 ◽  
Vol 224 ◽  
pp. 02074 ◽  
Author(s):  
Vladislav Lavrinenko ◽  
Anastasiya Polyakova ◽  
Artyom Polyakov
Keyword(s):  
Experimental Data ◽  
Computer Simulation ◽  
Pressing Method ◽  
Die Pressing ◽  
Research Outcome ◽  
Simulation Results ◽  
Metal Economy ◽  
Parts Fabrication

This paper analyses die pressing method used for fabrication of ring-shaped parts, which assures significant metal economy. Computer simulation results obtained with PAM-STAMP software are compared with experimental data. The research outcome is the established range of applicability of die-pressing method for manufacturing ring-shaped parts.

Effect of Nd content on the magnetic properties and crystallographic alignment of Fe–Nd–B–Al sintered magnets

1997 ◽  
Vol 12 (10) ◽  
pp. 2715-2718 ◽  
Author(s):  
W. Kaszuwara ◽  
M. Leonowicz ◽  
H. A. Davies
Keyword(s):  
Magnetic Properties ◽  
Ball Milling ◽  
Cold Welding ◽  
Small Particles ◽  
Sintered Magnet ◽  
Rich Phase ◽  
Sintered Magnets ◽  
Powder Particles

The magnetic properties and crystallographic alignment for Fe–Nd–B–Al magnets having different Nd contents were studied. It was found that higher Nd concentration (above 18 at. %) resulted in deterioration of the alignment. Also, extended ball milling of the powder particles resulted in poorer alignment of the grains in the final sintered magnet. This behavior was attributed to the cold welding of the small particles of the Fe14Nd2B phase by a mechanically soft Nd-rich phase in the course of ball milling.

Fabrication of 1–3 connectivity (Ba0.95Pb0.05)(Ti0.99Co0.01)O3/monothane-A70 composites by die-pressing method and their electrical characterizations

2014 ◽  
Vol 40 (8) ◽  
pp. 11477-11484 ◽  
Author(s):  
Muhammad Saleem Mirza ◽  
Tariq Yasin ◽  
Masroor Ikram ◽  
Muhammad Nasir Khan ◽  
Muhammad Shuaib
Keyword(s):  
Pressing Method ◽  
Die Pressing ◽  
Electrical Characterizations

Tuning the Magnetic Alignment of Cellulose Nanocrystals from Perpendicular to Parallel Using Lepidocrocite Nanoparticles

2019 ◽  
Author(s):  
Valentina Guccini ◽  
Sugam Kumar ◽  
Yulia Trushkina ◽  
Gergely Nagy ◽  
Christina Schütz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Cellulose Nanocrystals ◽  
Small Angle Neutron Scattering ◽  
Lower Amount ◽  
Magnetic Alignment ◽  
Polarized Optical Microscopy ◽  
Parallel Orientation ◽  
Weak Magnetic Fields

The magnetic alignment of cellulose nanocrystals (CNC) and lepidocrocite nanorods (LpN), pristine and in hybrid suspensions has been investigated using contrast-matched small-angle neutron scattering (SANS) under in situ magnetic fields (0 – 6.8 T) and polarized optical microscopy. The pristine CNC (diamagnetic) and pristine LpN (paramagnetic) align perpendicular and parallel to the direction of field, respectively. The alignment of both the nanoparticles in their hybrid suspensions depends on the relative amount of the two components (CNC and LpN) and strength of the applied magnetic field. In the presence of 10 wt% LpN and fields < 1.0 T, the CNC align parallel to the field. In the hybrid containing lower amount of LpN (1 wt%), the ordering of CNC is partially frustrated in all range of magnetic field. At the same time, the LpN shows both perpendicular and parallel orientation, in the presence of CNC. This study highlights that the natural perpendicular ordering of CNC can be switched to parallel by weak magnetic fields and the incorporation of paramagnetic nanoparticle as LpN, as well it gives a method to influence the orientation of LpN.<br>

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