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| Effect of calcium on the anisotropic Nd-Fe-B magnetic powders by HDDR-treated |
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Received:November 15, 2021
Revised:November 23, 2021
Accepted:November 29, 2021
Published Online:April 27, 2022
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| DOI： |
| KeyWord:Nd-Fe-B magnetic powders; anisotropic; HDDR process; oxygen content; magnetic properties |
| Author | Institution |
| LIU Dong |
BGRIMM Magnetic Materials Technology FuyangCo,Ltd |
| SUN Wei |
National Engineering Research Center for Magnetic Materials,BGRIMM Technology Group;BGRIMM Magnetic Materials Technology FuyangCo,Ltd |
| LIU Rong-ming |
National Engineering Research Center for Magnetic Materials,BGRIMM Technology Group;BGRIMM Magnetic Materials Technology FuyangCo,Ltd |
| WANG Qian |
National Engineering Research Center for Magnetic Materials,BGRIMM Technology Group;BGRIMM Magnetic Materials Technology FuyangCo,Ltd |
| LI Qing-hua |
National Engineering Research Center for Magnetic Materials,BGRIMM Technology Group;BGRIMM Magnetic Materials Technology FuyangCo,Ltd |
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| Abstract: |
| Hydrogenation-decomposition-desorption-recombination (HDDR)-treated anisotropic powders were prepared from Nd28.5Fe余B1.0Ga0.3Nb0.3 (%) alloy ingot. Effect of calcium content on oxygen content and the magnetic properties of magnetic powders were studied. The results show that adding a small amount of calcium can significantly reduce the oxidation degree of magnetic powders and greatly improve the magnetic properties of magnetic powders. When the calcium content is less than 0.1mass%, the higher oxygen content of magnetic powders results in inferior intrinsic coercivity Hcj and maximum magnetic energy product (BH) max. When calcium content is greater than 0.3%, the excessive residual non-magnetic phase in magnetic powders and the agglomeration of particles lead to the overall decline of the technical indicators of magnetic powders. The appropriate amount of calcium is 0.1~0.3%. When the amount of calcium is 0.2%, the comprehensive magnetic properties of magnetic powders are the best: Br=1.37 T、Hcj=1 296 kA/m、(BH)max=340 kJ/m3. |
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