The Influence of Si, Ga and Gd Content on the Magnetic Properties of Pr-Fe-Co-B-Nb HDDR Bonded Magnets

2006 ◽  
Vol 530-531 ◽  
pp. 164-169
Author(s):  
E. Galego ◽  
Hidetoshi Takiishi ◽  
Rubens Nunes de Faria Jr.
Keyword(s):  
Magnetic Properties ◽  
Permanent Magnets ◽  
Magnetic Behaviour ◽  
Element Content ◽  
Cyanoacrylate Adhesive ◽  
Microstructure And Magnetic Properties

This paper reports the results of investigations carried out to determine the microstructure and magnetic properties of some praseodymium-based magnets represented by the formula Pr14Fe63.9-xCo16B6Nb0.1Mx. Bonded magnets were prepared the annealed alloys using the hydrogenation, disproportionation, desorption and recombination (HDDR) process. The HDDR powders were isostatically pressed and bonded with cyanoacrylate adhesive to form permanent magnets. The effect of addition element content on the magnetic properties of these magnets was investigated. The amount of addition has a significant effect on the magnetic behaviour of these bonded magnets.

Microstructure and Magnetic Properties of RE2.28Fe13.58B1.14 Alloys

2016 ◽  
Vol 848 ◽  
pp. 709-714 ◽  
Author(s):  
Gang Fu ◽  
Jiang Wang ◽  
Mao Hua Rong ◽  
Guang Hui Rao ◽  
Huai Ying Zhou
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Rare Earth ◽  
Single Phase ◽  
Permanent Magnets ◽  
Industrial Applications ◽  
Arc Melting ◽  
Light Rare Earth Elements ◽  
Curie Temperatures ◽  
Microstructure And Magnetic Properties

The rare-earth (RE) permanent magnets based on Nd2Fe14B with excellent magnetic properties have been widely used in industrial applications. In this work, the crystal structure, microstructure and magnetic properties of Nd2.28Fe13.58B1.14, Ce2.28Fe13.58B1.14 and Pr2.28Fe13.58B1.14 alloys prepared by arc-melting were investigated. The results show that all alloys are single phase with tetragonal Nd2Fe14B-type (space group P42/mnm). The Curie temperatures (Tc) of RE2.28Fe13.58B1.14 (RE=Nd, Ce, Pr) alloys are 583 K, 423 K and 557 K, respectively. On the other hand, the coercivities of Nd2.28Fe13.58B1.14 and Pr2.28Fe13.58B1.14 alloys are about 1.05 T and 1.23 T, respectively, while that of Ce2.28Fe13.58B1.14 alloy is only about 0.25 T due to the poor squareness of hysteresis loop. Meanwhile, the saturation magnetizations of Nd2.28Fe13.58B1.14 and Pr2.28Fe13.58B1.14 alloys are about 135 emu/g and 113 emu/g, respectively, while that of Ce2.28Fe13.58B1.14 alloy is about 97 emu/g. It was indicated that the Curie temperatures and magnetic properties of RE2.28Fe13.58B1.14 alloys with the same crystal structure are dependent on light rare earth elements.

Thermodynamic Calculation of the Heavy Rare Earth Permanent Magnets: Fe-RE (RE=Gd, Tb, Dy, Lu) Binary Systems

2017 ◽  
Vol 1142 ◽  
pp. 62-68
Author(s):  
Xiao Long Chen ◽  
Jiang Wang ◽  
Tai Li Chen ◽  
Mao Hua Rong ◽  
Guang Hui Rao ◽  
...  
Keyword(s):  
Experimental Data ◽  
Magnetic Properties ◽  
Phase Equilibria ◽  
Binary Systems ◽  
Permanent Magnets ◽  
Ternary Systems ◽  
Calphad Method ◽  
Experimental Investigations ◽  
Heavy Rare Earth ◽  
Microstructure And Magnetic Properties

The Fe-RE (RE=Gd, Tb, Dy, Lu) binary systems with the experimental data of phase equilibria and thermodynamic properties in the published literature were reviewed firstly. Based on available phase equilibria data and thermodynamic data, the Fe-RE (RE=Gd, Tb, Dy, Lu) binary systems were assessed thermodynamically using the CALPHAD method. As a result, further experimental investigations and thermodynamic calculations would be both required in order to develop thermodynamic database of the RE-Fe-B ternary systems, which is very useful to study the relations between alloy compositions, microstructure and magnetic properties of novel Nd-Fe-B-based permanent magnets.

Correlation between Microstructure and Magnetic Properties in FeNdB Permanent Magnets Doped with Al2O3

1989 ◽  
Vol 114 (2) ◽  
pp. 685-691 ◽  
Author(s):  
L. F. Kiss ◽  
G. Martinek ◽  
A. Forkl ◽  
H. Kronmüller
Keyword(s):  
Magnetic Properties ◽  
Permanent Magnets ◽  
Microstructure And Magnetic Properties

scholarly journals Microstructure and Magnetic Properties of Ce14Fe78Co2B6 Nanopowders Prepared by Ball Milling at Low Temperature

2021 ◽  
Vol 7 (12) ◽  
pp. 160
Author(s):  
Marian Grigoras ◽  
Mihaela Lostun ◽  
Firuta Borza ◽  
Marieta Porcescu ◽  
George Stoian ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Ball Milling ◽  
Liquid Nitrogen ◽  
High Performance ◽  
Permanent Magnets ◽  
X Ray Diffraction ◽  
Hard Magnetic Properties ◽  
Uniform Particle Size ◽  
Microstructure And Magnetic Properties

Ce14Fe78Co2B6 nanopowders with hard-magnetic properties have been successfully prepared by ball milling at low temperatures in liquid nitrogen. The morphology, structure, and magnetic properties of Ce14Fe78Co2B6 powders have been investigated using scanning electron microscopy, X-ray diffraction, and vibrating sample magnetometry, respectively. It was found that powder ball milling at low temperature in liquid nitrogen, has the advantage that the oxidation of powders is inhibited and the particles rapidly reach nanometric dimensions. In comparison to the Ce14Fe78Co2B6 powders prepared by ball milling at room temperature, the powders milled at low temperature present a more uniform particle size and no rare-earth oxides, which leads thus to remarkable magnetic properties. The nanocrystalline Ce14Fe78Co2B6 powders with optimum characteristics, prepared at low temperature, have the size of 153 nm or less, present a coercivity of 5.1 kOe, and a saturation magnetization of 113 emu/g after milling for 6 h at low temperature. Low temperature milling may become a promising technique for the fabrication of high performance powders used for permanent magnets preparation.

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