High-coercivity ultrafine-grained anisotropic Nd–Fe–B magnets processed by hot deformation and the Nd–Cu grain boundary diffusion process

2013 ◽  
Vol 61 (17) ◽  
pp. 6622-6634 ◽  
Author(s):  
H. Sepehri-Amin ◽  
T. Ohkubo ◽  
S. Nagashima ◽  
M. Yano ◽  
T. Shoji ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Diffusion Process ◽  
Hot Deformation ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion ◽  
High Coercivity ◽  
Ultrafine Grained

High-coercivity Nd-Fe-B magnets obtained with the electrophoretic deposition of submicron TbF3 followed by the grain-boundary diffusion process

2016 ◽  
Vol 115 ◽  
pp. 278-284 ◽  
Author(s):  
Marko Soderžnik ◽  
Matic Korent ◽  
Kristina Žagar Soderžnik ◽  
Matthias Katter ◽  
Kaan Üstüner ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Diffusion Process ◽  
Electrophoretic Deposition ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion ◽  
High Coercivity

Coercivity Enhancement of Nd-Fe-B HDDR Powder by Grain Boundary Diffusion Process with Rare-Earth Hydride

JOM ◽  
2018 ◽  
Vol 70 (5) ◽  
pp. 661-665 ◽  
Author(s):  
Hee-Ryoung Cha ◽  
Jae-Gyeong Yoo ◽  
Youn-Kyoung Baek ◽  
Dong-Hwan Kim ◽  
Hae-Woong Kwon ◽  
...  
Keyword(s):  
Rare Earth ◽  
Grain Boundary ◽  
Diffusion Process ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion

scholarly journals Coercivity enhancement in heavy rare earth-free NdFeB magnets by grain boundary diffusion process

2018 ◽  
Vol 113 (15) ◽  
pp. 152402 ◽  
Author(s):  
D. Salazar ◽  
A. Martín-Cid ◽  
R. Madugundo ◽  
J. M. Barandiaran ◽  
G. C. Hadjipanayis
Keyword(s):  
Rare Earth ◽  
Grain Boundary ◽  
Diffusion Process ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion ◽  
Heavy Rare Earth ◽  
Ndfeb Magnets

scholarly journals Nd-Fe-B Magnets: The Gradient Change of Microstructures and the Diffusion Principle after Grain Boundary Diffusion Process

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3881 ◽  
Author(s):  
Yaojun Lu ◽  
Shuwei Zhong ◽  
Munan Yang ◽  
Chunming Wang ◽  
Liuyimei Yang ◽  
...  
Keyword(s):  
Surface Layer ◽  
Grain Boundary ◽  
Diffusion Process ◽  
Shell Structure ◽  
Boundary Diffusion ◽  
Diffusion Mechanism ◽  
Temperature Stability ◽  
Grain Boundary Diffusion ◽  
Core Shell ◽  
Core Shell Structure

The diffusion of Tb in sintered Nd-Fe-B magnets by the grain boundary diffusion process can significantly enhance coercivity. However, due to the influence of microstructures at different depths, the coercivity increment and temperature stability gradually decreases with the increase of diffusion depth, and exhibit good corrosion resistance at a sub-surface layer (300–1000 μm). According to the Electron Probe Micro-analyzer (EPMA) test results and the diffusion mechanism, the grain boundary and intragranular diffusion behavior under different Tb concentration gradients were analyzed, and the diffusion was divided into three stages. The first stage is located on the surface of the magnet, which formed a thick core-shell structure and a large number of RE-rich phases. The second stage is located in the sub-surface layer, forming a uniform and continuous RE-rich phase and thin core-shell structure. The third stage is located deeper in the magnet, and the Tb enrichment only existed at the triangular grain boundary.

The stability of triple junctions during the grain boundary diffusion process

1996 ◽  
Vol 3 (4) ◽  
Author(s):  
E. Rabkin ◽  
W. Gust ◽  
L.S. Shvindlerman ◽  
A.N. Aleshin
Keyword(s):  
Grain Boundary ◽  
Diffusion Process ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion ◽  
Triple Junctions ◽  
The Stability
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