Coercivity enhancement of hot-deformed NdFeB permanent magnets with AlCuZn eutectic alloy grain boundary diffusion

Rare Metals ◽  
2021 ◽  
Author(s):  
Ye-Qi Yu ◽  
Kuo-She Li ◽  
Hai-Jun Peng ◽  
Xin-Yuan Bai ◽  
Ning-Tao Quan ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Eutectic Alloy ◽  
Permanent Magnets ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion

New development of permanent magnets through grain boundary diffusion and nanostructuring

NANO ◽  
2021 ◽  
Author(s):  
Varun Chaudhary ◽  
S. N. Piramanayagam
Keyword(s):  
Grain Boundary ◽  
Permanent Magnets ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion ◽  
New Development

Development of Non-Rare Earth Grain Boundary Diffusion Process for Nd-Fe-B Permanent Magnets

2020 ◽  
Author(s):  
Zhongwu Liu ◽  
Jiayi He ◽  
Qing Zhou ◽  
Huixin Zeng
Keyword(s):  
Rare Earth ◽  
Grain Boundary ◽  
Diffusion Process ◽  
Permanent Magnets ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion

Microstructural Evaluation of Dy-Ni-Al Grain-Boundary-Diffusion (GBD) Treatment on Sintered Nd-Fe-B Magnet

2010 ◽  
Vol 654-656 ◽  
pp. 2919-2922 ◽  
Author(s):  
Naoko Oono ◽  
Masato Sagawa ◽  
Ryuta Kasada ◽  
Hideki Matsui ◽  
Akihiko Kimura
Keyword(s):  
Melting Point ◽  
Grain Boundary ◽  
Eutectic Alloy ◽  
Alloy Powder ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion ◽  
Rich Phase ◽  
X Ray ◽  
Microstructural Evaluation

A novel GBD treatment with Dy-Ni-Al eutectic alloy powder enhanced the coercivity of the sintered Nd-Fe-B magnet plate as thick as 5mm to 1760 kA/m (22 kOe) without reducing the remanence. The results of wavelength dispersive X-ray spectroscopy (WDS) indicated that this industrially epoch-making treatment spread Dy, which is a coercivity enhancing element, from the surface to the centre of the magnet through Nd-rich phase. Microstructural observations suggested that Ni and Al, which are the melting point depressants of Nd and Dy, enabled the high diffusivity of Dy.

scholarly journals Grain Boundary Diffusion Sources and Their Coating Methods for Nd-Fe-B Permanent Magnets

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1434
Author(s):  
Jiayi He ◽  
Jiali Cao ◽  
Zhigao Yu ◽  
Wenyue Song ◽  
Hongya Yu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Grain Boundary ◽  
Permanent Magnets ◽  
Boundary Diffusion ◽  
Elevated Temperatures ◽  
Inorganic Compounds ◽  
Grain Boundary Diffusion ◽  
Diffusion Treatment ◽  
Coating Methods ◽  
Diffusion Source

Nd-Fe-B magnets containing no heavy rare earth (HRE) elements exhibit insufficient coercivity to withstand the demagnetization field at elevated temperatures. The grain boundary diffusion (GBD) process provides the best route to fabricate high-coercive Nd-Fe-B magnets with low consumption of expensive HRE resources. Here we give a special review on the grain boundary diffusion sources and their coating methods. Up to now, various types of grain boundary sources have been developed, starting from the earliest Tb or Dy metal. The HRE-M eutectic alloys were firstly proposed for reducing the cost of the diffusion source. After that, the diffusion sources based on light rare earth and even non rare earth elements have also been proposed, leading to new understanding of GBD. Now, the diffusion sources including inorganic compounds, metals, and alloys have been employed in the industry. At the same time, to coat the diffusion source on the magnets before diffusion treatment, various methods have been developed. Different from the previous review articles for GBD, this review gives an introduction of typical types of diffusion sources and their fabrication approaches. The effects of diffusion source on the microstructure and magnetic properties are summarized briefly. In particular, the principles and applicability of different coating approaches were discussed in detail. It is believed that this review can provide a technical guidance for the industry for designing the diffusion process and products meeting specific requirements.

Enhancement of coercivity of hot-deformed Nd–Fe–B anisotropic magnet by low-temperature grain boundary diffusion of Nd60Dy20Cu20 eutectic alloy

2013 ◽  
Vol 69 (9) ◽  
pp. 647-650 ◽  
Author(s):  
H. Sepehri-Amin ◽  
J. Liu ◽  
T. Ohkubo ◽  
K. Hioki ◽  
A. Hattori ◽  
...  
Keyword(s):  
Low Temperature ◽  
Grain Boundary ◽  
Eutectic Alloy ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion ◽  
Anisotropic Magnet

Grain boundary diffusion in nanocrystalline Nd-Fe-B permanent magnets with low-melting eutectics

2016 ◽  
Vol 115 ◽  
pp. 354-363 ◽  
Author(s):  
Simon Sawatzki ◽  
Christian Kübel ◽  
Semih Ener ◽  
Oliver Gutfleisch
Keyword(s):  
Grain Boundary ◽  
Permanent Magnets ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion

EFFECT OF Y ON CATION AND ANION GRAIN BOUNDARY DIFFUSION IN CHROMIA

1990 ◽  
Vol 51 (C1) ◽  
pp. C1-551-C1-556
Author(s):  
W. E. KING ◽  
J. H . PARK
Keyword(s):  
Grain Boundary ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion
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