Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Neodymium-iron-boron magnet and preparation method thereof

A technology of NdFeB and magnetic materials, which is applied in the manufacture of permanent magnets, magnets, magnetic objects, etc., can solve the problems of decreased magnetic field strength, magnetic induction intensity and magnetic energy product, etc., to reduce magnetic attenuation, increase coercive force, and improve Effects of corrosion resistance and wear resistance

Pending Publication Date: 2021-02-02
宁波奥达磁业有限公司
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is a chemical electromotive force difference between the main phase (-0.515V) and the Nd-rich phase (-0.65V), which causes intergranular corrosion between different phases and affects the corrosion resistance of NdFeB magnets. At the same time, Dy Atoms and Fe atoms will form antiferrocoupling, resulting in a decrease in residual magnetic induction intensity and magnetic energy product, and the magnetic field intensity generated by permanent magnets in extreme environments at high temperatures will also decrease.

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
  • Neodymium-iron-boron magnet and preparation method thereof
  • Neodymium-iron-boron magnet and preparation method thereof
  • Neodymium-iron-boron magnet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] An NdFeB magnetic material comprises a magnetic material body and a composite coating arranged on the surface of the magnetic material body, and the composite coating includes an inner coating and an outer coating.

[0065] The magnetic body contains the following elements by weight: Nd: 17wt%, B: 0.6wt%, Pr: 6.0wt%, Dy: 2wt%, Al: 0.3wt%, Cu: 0.1wt%, Co: 0.1wt%, The rest is Fe.

[0066] The inner coating includes Cr: 7.3wt%, B: 2.4wt%, Dy: 4.25wt%, Gd: 2.7wt%, and the rest are Fe; the outer coating includes graphite: 17.3wt%, Nb: 2.82wt%; Ti : 23wt%; SiC: 6.7%; Mo: 1.13wt%, and the rest are Ni.

[0067] A method for preparing an NdFeB magnetic material, comprising S1, the preparation of a magnetic material body, and its specific steps include:

[0068] S1.1, mixing materials:

[0069] Pre-purchase the raw materials required for the main body of the magnetic material, and mix Nd, B, Pr, Dy, Al, Cu, Fe, Co in the above proportions to form a magnetic material mixed powd...

Embodiment 2-4

[0097] Embodiment 2-Embodiment 4 are all based on the method of Embodiment 1, and the content of each component of the magnetic material body is adjusted, and the specific adjustment is shown in Table 1 below.

[0098] Table 1 Component and component content table of embodiment 1-4

[0099] Example 1 Example 2 Example 3 Example 4 Nd 17 19 21 23 B 0.6 0.5 1.0 1.2 Pr 6 7 9 10 Dy 2 3 4 5 Al 0.3 0.4 0.6 0.9 Cu 0.1 0.12 0.17 0.20 co 0.1 0.12 0.13 0.15 Fe 73.9 69.86 64.1 59.55

Embodiment 5

[0101] The difference from Example 1 is that the magnetic material body does not undergo S1.7 nitriding treatment after S1.6 aging treatment.

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

No PUM Login to View More

Abstract

The invention relates to the field of magnetic materials, in particular to a neodymium-iron-boron magnet and a preparation method thereof. The neodymium-iron-boron magnetic material comprises a magnetic material body and a composite coating arranged on the surface of the magnetic material body, wherein the magnetic material body comprises the following elements in percentage by weight: 17-23 percent of Nd, 0.5-1.2 percent of B, 6-10 percent of Pr, 2-5 percent of Dy, 0.3-0.9 percent of Al, 0.1-0.2 percent of Cu and the balance of Fe. The composite coating comprises an inner coating and an outercoating. The preparation method comprises the following steps of S1, preparing the magnetic material body, S2, preparing an inner coating, and S3, preparing an outer coating. The neodymium-iron-boronmagnet disclosed by the invention has the advantages of excellent corrosion resistance, relatively high coercive force and relatively high maximum working temperature. In addition, the preparation method disclosed by the invention has the advantages of simplicity in operation and convenience in mass production.

Description

technical field [0001] The invention relates to the field of magnetic materials, more specifically, it relates to a neodymium-iron-boron magnet and a preparation method thereof. Background technique [0002] Sintered NdFeB magnets have excellent magnetic properties at room temperature and are an important class of basic functional materials. Remanence Br, coercive force H cj It is the basic technical magnetic parameter of the magnet, which is not only determined by the chemical composition of the material, but also closely related to its organizational structure. [0003] At present, the main methods for preparing NdFeB magnets include smelting alloying, grain boundary diffusion technology, double alloy method (including dual main phase method) and so on. Among them, heavy rare earth is added by alloying method to form (NdDy)2Fe14B hard magnetic phase with high magnetic crystal anisotropy, which can significantly improve the coercive force of the magnet and reduce the atte...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F7/02H01F41/02
CPCH01F1/0577H01F7/0221H01F41/0266H01F41/026H01F41/0293
Inventor 王鸣亮包振宇施益松
Owner 宁波奥达磁业有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com