Neodymium-iron-boron magnetic powder and preparation method thereof

The invention belongs to the technical field of rare earth permanent magnetic materials, and discloses neodymium iron boron magnetic powder and a preparation method thereof. The method comprises the following steps: (1) ingredient smelting; (2) coarse crushing: crushing a cast ingot or a rapid harde...

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Bibliographic Details
Main Author PENG YIHONG
Format Patent
LanguageChinese
English
Published 10.08.2021
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRICITY
INDUCTANCES
MAGNETS
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TRANSFORMERS
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Summary:The invention belongs to the technical field of rare earth permanent magnetic materials, and discloses neodymium iron boron magnetic powder and a preparation method thereof. The method comprises the following steps: (1) ingredient smelting; (2) coarse crushing: crushing a cast ingot or a rapid hardening sheet prepared in the step (1) into fine particles; (3) rapid quenching and melt-spinning: adding magnetic powder obtained after coarse crushing in the step (2) into an induction furnace, smelting, and carrying out rapid quenching and melt-spinning treatment to obtain an amorphous neodymium iron boron thin strip; (4) tempering treatment, wherein the homogenization of the amorphous thin strip is improved, and the mechanical property of the material is improved; (5) secondary crushing and screening at low temperature; (6) crystallization treatment, so that the microstructure of the NdFeB thin strip is converted into nanocrystalline; and (7) salt mist aging treatment, so that the magnetic performance and oxidatio
Bibliography:Application Number: CN202110353955