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Optimizing the grain boundary structure of sintered Nd-Dy-Fe-Co-B magnets by low-melting-point alloys grain boundary addition.
- Source :
-
Journal of Alloys & Compounds . Mar2024, Vol. 976, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- To respond to the gradually increasing demand for thermal stability of sintered NdFeB magnets and grasp the evolution rules of their phase structure, research on sintered Nd-Dy-Fe-Co-B magnets was conducted. The magnets used in this study were prepared by the powder metallurgy method (Strip Casting + Hydrogen Decrepitation + Jet Milling). The room temperature magnetic properties of the magnet sample were B r = 11.45 kGs and H cj = 22.42 kOe, with a low-temperature coefficient of B r (α Br (20 °C∼100 °C) = −0.059 %/°C) and a high Curie temperature (T c = 460 °C). Based on the microstructure observation, there were planar anisotropic soft magnetic phase Nd 2 Co 17 within grain boundaries and the "Cu-Co Opposite Distribution". Low-melting-point binary alloy Pr 80 Cu 20 was introduced into the magnet by grain boundary addition to eliminate Nd 2 Co 17 phases and improve the coercivity. After the grain boundary addition, the "Cu-Co Opposite Distribution" was used to eliminate the Nd 2 Co 17 phase, the grain boundary structure was optimized, and the coercivity was increased by approximately 2.6 kOe, which was approximately 10 % of the total coercivity. Therefore, Cu-containing low-melting-point binary alloy grain boundary addition is an effective method for optimizing the grain boundary structure of Nd-Dy-Fe-Co-B magnets, thereby improving the high-temperature stability and coercivity. • The "Cu-Co Opposite Distribution" was found in the Nd-Dy-Fe-Co-B magnets. • The planar anisotropic soft magnetic phase Nd 2 Co 17 was found in grain boundaries. • Pr 80 Cu 20 binary alloy grain boundary addition is an effective method for optimizing the grain boundary structure. • The orientation behavior of sintered NdFeB magnets cannot be changed by the substitution of Co. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 976
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 174758684
- Full Text :
- https://doi.org/10.1016/j.jallcom.2023.173117