Methods for manufacturing cerium-rich anisotropy nano-crystalline rare-earth permanent magnets

A rare earth permanent magnet, anisotropic technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as high sintering temperature, increased production cost, and affecting the magnetic properties of products

Active Publication Date: 2015-04-29
SICHUAN UNIV
View PDF2 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional sintering method is used to prepare anisotropic rare earth permanent magnets containing Ce. Although high-performance anisotropic magnets can be prepared, the process is complicated and requires hydrogen explosion, dehydrogenation, jet milling, mixing, and magnetic fields. Forming and sintering processes have long production cycle, low efficiency, long sintering time, high sintering temperature (1000℃~1100℃), and high energy consumption
In addition, due to the high activity of Ce, it is easily oxidized in the process of jet milling, mixing and magnetic field forming orientation, resulting in performance deterioration. Therefore, strict measures must be taken

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Methods for manufacturing cerium-rich anisotropy nano-crystalline rare-earth permanent magnets
  • Methods for manufacturing cerium-rich anisotropy nano-crystalline rare-earth permanent magnets
  • Methods for manufacturing cerium-rich anisotropy nano-crystalline rare-earth permanent magnets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation process steps of the cerium-rich anisotropic nanocrystalline rare earth permanent magnet in this embodiment are as follows:

[0046] (1) According to the chemical formula (Ce 0.2 Nd 0.8 ) 32.7 Fe 66.22 B 1.08 The raw materials used are rare earth cerium and rare earth neodymium with a purity greater than 99.5%, pure iron with a purity greater than 99.9%, and ferroboron with a boron content of 19.3wt%.

[0047] (2) will prepare (Ce 0.2 Nd 0.8 ) 32.7 Fe 66.22 B 1.08 The alloy raw materials are put into the smelting quick-setting crucible of the intermediate frequency induction furnace, and the vacuum degree reaches 10 -2 When Pa is above, power on and preheat until the vacuum degree reaches 10 again. -2 When the pressure of Ar in the furnace reaches -0.05MPa, adjust the power of the melting furnace to the melting power for smelting. After all the raw materials are melted, stir and refine for 3 minutes. After refining, the alloy liquid Pouring in...

Embodiment 2

[0052] The preparation process steps of the cerium-rich anisotropic nanocrystalline rare earth permanent magnet in this embodiment are as follows:

[0053] (1) According to the chemical formula Ce 29.82 Fe 69.18 B 1.0 、Nd 29.81 Fe 68.73 Ga 0.53 B 0.93 Ingredients: The raw materials used are rare earth cerium and rare earth neodymium with a purity greater than 99.5%, pure iron with a purity greater than 99.9%, iron boron with a boron content of 19.3wt%, and metal gallium with a purity of 99.99%.

[0054] (2) The prepared Ce 29.82 Fe 69.18 B 1.0 Alloy raw materials and Nd 29.81 Fe 68.73 Ga 0.53 B 0.93 The alloy raw materials are put into the melting quick-setting crucible of the intermediate frequency induction furnace respectively, and the vacuum degree reaches 10 -2 When Pa is above, power on and preheat until the vacuum degree reaches 10 again. -2When the pressure of Ar in the furnace reaches -0.05MPa, adjust the power of the melting furnace to the melting power...

Embodiment 3

[0059] The preparation process steps of the cerium-rich anisotropic nanocrystalline rare earth permanent magnet in this embodiment are as follows:

[0060] (1) According to the chemical formula (Ce 0.4 Nd 0.6 ) 32.7 Fe 66.22 B 1.08 、Nd 29.82 Fe 62.42 co 6.76 B 1.0 Ingredients: The raw materials used are rare earth cerium and rare earth neodymium with a purity greater than 99.5%, pure iron with a purity greater than 99.9%, iron boron with a boron content of 19.3wt%, and metal cobalt with a purity greater than 99.6%.

[0061] (2) will prepare (Ce 0.4 Nd 0.6 ) 32.7 Fe 66.22 B 1.08 Alloy raw materials and Nd 29.82 Fe 62.42 co 6.76 B 1.0 The alloy raw materials are put into the melting quick-setting crucible of the intermediate frequency induction furnace respectively, and the vacuum degree reaches 10 -2 When Pa is above, power on and preheat until the vacuum degree reaches 10 again. -2 When the pressure of Ar in the furnace reaches -0.05MPa, adjust the power of t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Grain sizeaaaaaaaaaa
Sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for manufacturing cerium-rich anisotropy nano-crystalline rare-earth permanent magnets. The method includes (1), proportioning materials according to a chemical formula of (Ce<x>, RE<1-x>)Fe<100-a-b-c>BTM<c>; (2), melting the materials to obtain alloy ingots; (3), crushing the alloy ingots, and then rapidly quenching melt to obtain rapidly quenched magnetic powder; (4), carrying out hot-pressing on the rapidly quenched magnetic powder for 1-10 minutes at the temperatures ranging from 500 DEG C to 800 DEG C under the pressures ranging from 100MPa to 300MPa, and then enabling the rapidly quenched powder to thermally deform for 3-10 minutes at the temperatures ranging from 600 DEG C to 900 DEG C under the pressures ranging from 50MPa to 200MPa. The invention further provides a method for manufacturing the cerium-rich anisotropy nano-crystalline rare-earth permanent magnets according to chemical formulas of (Ce<x>, RE<1-x>)Fe<100-a-b-c>BTM<c> and NdFe<100-a-b-c>BTM<c>. The methods have the advantages that processes can be simplified, the cost can be reduced, and the obtained cerium-rich anisotropy nano-crystalline rare-earth permanent magnets are excellent in magnetic performance.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, and in particular relates to a preparation method of anisotropic nanocrystalline rare earth permanent magnets containing Ce. Background technique [0002] As the scale of the NdFeB industry continues to grow, the raw material neodymium metal and praseodymium-Nd alloy resources used in NdFeB magnets are becoming more and more scarce. Ce 2 Fe 14 B has magnetic properties at room temperature, and its saturation magnetic polarization is 1.17T, which provides a theoretical basis for using Ce to prepare magnets to replace part of neodymium metal and praseodymium neodymium alloy resources, and in natural rare earth resources, the reserves of Ce Plentiful and inexpensive. [0003] At present, the traditional sintering method is used to prepare anisotropic rare earth permanent magnets containing Ce. Although high-performance anisotropic magnets can be prepared, the process...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01F41/02H01F1/053H01F1/08B22F3/14
Inventor 刘颖李军王仁全沈鑫张蛟
Owner SICHUAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap