Microstructure and magnetic performance of Nd–Y–Ce–Fe–B sintered magnets after annealing

Rare Metals ◽  
2021 ◽  
Author(s):  
Xiao-Lian Liu ◽  
Xiao-Wei Wu ◽  
Jia-Ying Jin ◽  
Yong-Ming Tao ◽  
Xin-Hua Wang ◽  
...  
Keyword(s):  
Sintered Magnets ◽  
Magnetic Performance

The effect of Dy2O3/MoS2 co-doping on magnetic performance and microstructure in Nd-Fe-B sintered magnets

2020 ◽  
Vol 498 ◽  
pp. 166103 ◽  
Author(s):  
Fang Yang ◽  
Shengzeng Lin ◽  
Peng Liu ◽  
Haixia Sun ◽  
Qian Qin ◽  
...  
Keyword(s):  
Sintered Magnets ◽  
Co Doping ◽  
Magnetic Performance

PrAl and PrDyAl diffusion into Nd-La-Ce-Fe-B sintered magnets: Critical role of surface microstructure in the magnetic performance

2020 ◽  
Vol 529 ◽  
pp. 147028
Author(s):  
Jiaying Jin ◽  
Wang Chen ◽  
Meixun Li ◽  
Xiaolian Liu ◽  
Mi Yan
Keyword(s):  
Critical Role ◽  
Surface Microstructure ◽  
Sintered Magnets ◽  
Magnetic Performance

scholarly journals Effect of the Temperature on the Magnetic and Energetic Properties of Soft Magnetic Composite Materials

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4400
Author(s):  
Luca Ferraris ◽  
Fausto Franchini ◽  
Emir Pošković ◽  
Marco Actis Grande ◽  
Róbert Bidulský
Keyword(s):  
Magnetic Materials ◽  
Eddy Currents ◽  
Electrical Machines ◽  
Soft Magnetic Materials ◽  
Magnetic Composite ◽  
Soft Magnetic ◽  
Soft Magnetic Composite ◽  
Magnetic Performance ◽  
Magnetic Circuits ◽  
Energetic Characterization

In recent years, innovative magnetic materials have been introduced in the field of electrical machines. In the ambit of soft magnetic materials, laminated steels guarantee good robustness and high magnetic performance but, in some high-frequency applications, can be replaced by Soft Magnetic Composite (SMC) materials. SMC materials allow us to reduce the eddy currents and to design innovative 3D magnetic circuits. In general, SMCs are characterized at room temperature, but as electrical machines operate at high temperature (around 100 °C), an investigation analysis of the temperature effect has been carried out on these materials; in particular, three SMC samples with different binder percentages and process parameters have been considered for magnetic and energetic characterization.

scholarly journals Analysis of thermal demagnetization behavior of Nd–Fe–B sintered magnets using magnetic domain observation

AIP Advances ◽  
2016 ◽  
Vol 6 (5) ◽  
pp. 056021
Author(s):  
Masaaki Takezawa ◽  
Soichiro Ikeda ◽  
Yuji Morimoto ◽  
Hisayuki Kabashima
Keyword(s):  
Magnetic Domain ◽  
Thermal Demagnetization ◽  
Sintered Magnets

MICROSTRUCTURE AND TEMPERATURE STABILITY OF SINTERED Nd-Dy-Fe-Co-Mo-Al-B MAGNETS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 721-724
Author(s):  
W. RODEWALD ◽  
P. SCHREY ◽  
B. WALL
Keyword(s):  
Solid Solution ◽  
Surface Treatment ◽  
Corrosion Behaviour ◽  
Temperature Stability ◽  
Partial Replacement ◽  
Compound A ◽  
Corrosion Tests ◽  
Sintered Magnets ◽  
Load Line ◽  
Intrinsic Coercivity

Simultaneous additions of Co and Mo or V, respectively, to Nd-Dy-Fe-Al-B alloys improve the temperature stability of sintered magnets. The intrinsic coercivity at 150 ºC amounts to 9 kA/cm for magnets with a Dy-content of 3 at.%. Hence magnets with a load line, B/μoH=−2, may be operated at temperatures up to 200 ºC. The additions of Mo or of V result in the precipitation of a tetragonal Mo2FeB2 compound, a=0.58 nm, c=0.32 nm, or of a tetragonal V3–xFexB2 compound, x=0.2...1.2, within the (Nd, Dy)2(Fe, Co, A1)14B grains. The dimensions of the precipitates range from 10 to 600 nm. Besides Mo2FeB2- or V3–xFex+B2-grains, respectively, with dimensions up to 10 μm were observed within the Nd-rich constituents. The intrinsic coercivity, however, is determined by nucleation of reversed domains. The addition of Co results in a partial replacement of the Nd-Fe solid solution by the Nd3Co compound. Corrosion tests revealed, that the corrosion behaviour is not improved significantly and depends much more on the surface treatment.

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