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Effect of Pressure on Ce-Substituted Nd-Fe-B Hot-Deformed Magnets in the Hot-Pressing Process
Ye Ryeong Jang1, Wonjin Kim1, Sumin Kim2
1Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea.
Materials (Basel, Switzerland)
|August 10, 2024
Summary
Optimizing hot-pressing pressure is key to enhancing magnetic properties in cerium-substituted neodymium-iron-boron (Nd-Fe-B) magnets. A pressure of 200 MPa during hot-pressing yields superior magnetic performance in these Ce-substituted Nd-Fe-B magnets.
Area of Science:
- Materials Science
- Magnetism
- Solid State Physics
Background:
- Neodymium-iron-boron (Nd-Fe-B) magnets are critical for high-performance applications.
- Cerium (Ce) substitution offers a cost-effective alternative to Neodymium (Nd).
- Optimizing processing is essential for maximizing magnetic properties in Ce-substituted Nd-Fe-B magnets.
Purpose of the Study:
- To investigate the effect of hot-pressing pressure on the microstructure and magnetic properties of Ce-substituted Nd-Fe-B hot-deformed magnets.
- To identify the optimal hot-pressing conditions for improved magnetic performance.
- To understand the relationship between precursor microstructure and final magnetic properties.
Main Methods:
- Fabrication of Ce-substituted Nd-Fe-B magnets using hot-pressing at varying pressures (100-300 MPa) followed by hot deformation.
- Microstructural analysis to examine grain alignment, density, and phase distribution.
- Magnetic property measurements, including coercivity (Hci), remanence (Br), and maximum energy product ((BH)max).
Main Results:
- Hot-pressing at 200 MPa followed by hot deformation yielded optimal magnetic properties: Hci = 8.9 kOe, Br = 12.2 kG, and (BH)max = 31 MGOe for magnets with 40% Ce substitution.
- Lower pressures (100 MPa) resulted in high porosity and poor magnetic properties.
- Higher pressures (300 MPa) led to grain coarsening and undesirable secondary phase formation (REFe2), disrupting texture.
- Suitable hot-pressing pressure ensures uniform RE-rich phase distribution and enhanced grain alignment.
Conclusions:
- Optimizing hot-pressing pressure is crucial for achieving superior magnetic properties in Ce-substituted Nd-Fe-B magnets.
- A pressure of 200 MPa during hot-pressing provides an ideal precursor microstructure for enhanced grain alignment and magnetic performance.
- This study offers a strategy for producing high-performance hot-deformed magnets with significant Ce content.
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