Coercive-force-enhanced NdFeB thermal deformation magnet as well as preparation method and application thereof

A technology of NdFeB and coercive force, which is applied in the fields of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., and can solve the problems of limited performance improvement of NdFeB magnets, etc.

Active Publication Date: 2015-02-11
宁波金鸡强磁股份有限公司
View PDF7 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effective thickness used to enhance the coercive force in this method is usually only a few millimeters on the surface of the magnet, which has limited ability to improve the performance of NdFeB magnets.

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
  • Coercive-force-enhanced NdFeB thermal deformation magnet as well as preparation method and application thereof
  • Coercive-force-enhanced NdFeB thermal deformation magnet as well as preparation method and application thereof
  • Coercive-force-enhanced NdFeB thermal deformation magnet as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] In this embodiment, the NdFeB system thermally deformable magnet with enhanced coercive force, the crystallized thin ribbon mixture (that is, the Nd-Fe-B system nanocrystalline magnetic powder) is mainly composed of (by weight fraction), neodymium: 30%, Praseodymium: 0%, Dysprosium: 0%, Terbium: 0%, Gallium: 0.5%, Copper: 0%, Cobalt: 6%, Boron: 5.6%, the balance is Fe and other unavoidable impurities, heavy rare earth oxides Preferably, dysprosium oxide accounts for 0.2% of the total mass of the crystallized ribbon-shaped mixture. The metal material composed of the crystallized thin ribbon-shaped mixture is formed into a thin ribbon-shaped sheet through a melting and rolling process, and then the crystallized thin ribbon-shaped mixture material is obtained by mechanical crushing. The particle size of dysprosium oxide is 0.2 μm. The thickness of the nanocrystalline fast-quenching band is 20 μm, and the grain size is about 15 nm.

[0061] Dysprosium oxide and the ab...

Embodiment 2

[0066] In this embodiment, the NdFeB hot deformable magnet with enhanced coercive force, the main composition of the crystallized thin ribbon mixture is (in terms of weight fraction), neodymium: 31%, praseodymium: 0%, dysprosium: 0%, terbium: 0%, Gallium: 0.2%, Copper: 0%, Cobalt: 0%, Boron: 6%, the balance is Fe and other unavoidable impurities, and the heavy rare earth oxide is preferably dysprosium oxide to account for the total mass of the crystallized thin ribbon mixture 0.1% of. The metal material composed of the crystallized thin ribbon-shaped mixture is formed into a thin ribbon-shaped sheet through a melting and rolling process, and then the crystallized thin ribbon-shaped mixture material is obtained by mechanical crushing. The particle size of dysprosium oxide is 0.1 μm. The thickness of the nanocrystalline fast-quenching band is 10 μm, and the grain size is about 17 nm.

[0067] Dysprosium oxide and the above-mentioned Nd-Fe-B nanocrystalline magnetic powder ...

Embodiment 3

[0072] In this embodiment, the NdFeB system heat deformable magnet with enhanced coercive force, the main composition of the crystallized thin ribbon mixture is (in terms of weight fraction), neodymium: 29%, praseodymium: 0%, dysprosium: 0%, terbium: 0%, gallium: 0.3%, copper: 0.1%, cobalt: 6%, boron: 5.5%, the balance is Fe and other unavoidable impurities, and the heavy rare earth oxide is preferably dysprosium oxide in the total mass of the crystallized thin ribbon mixture 1%. The metal material composed of the crystallized thin ribbon-shaped mixture is formed into a thin ribbon-shaped sheet through a melting and rolling process, and then the crystallized thin ribbon-shaped mixture material is obtained by mechanical crushing. The particle size of dysprosium oxide is 1 μm. The thickness of the nanocrystalline fast-quenching band is 30 μm, and the grain size is about 17 nm.

[0073] Dysprosium oxide and the above-mentioned Nd-Fe-B nanocrystalline magnetic powder are uni...

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 diameteraaaaaaaaaa
thicknessaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a coercive-force-enhanced NdFeB thermal deformation magnet as well as a preparation method and application thereof. The magnet comprises a crystallized ribbon-like mixture forming nanocrystalline quick-quenched ribbons, and heavy rare earth oxide doped between the nanocrystalline quick-quenched ribbons, wherein the crystallized ribbon-like mixture comprises the following main components (in percentage by weight): 21-31% of neodymium, 5.5-6% of boron, 0.2-0.8% of gallium, 0-22.3% of M, and the balance of ferrum and other unavoidable trace impurities, wherein M is one or more of praseodymium, dysprosium, terbium, copper and cobalt; the total mass of neodymium, praseodymium, dysprosium and terbium in the crystallized ribbon-like mixture is 29-31% that of the crystallized ribbon-like mixture; the heavy rare earth oxide is 0.1-6% of the total mass of the crystallized ribbon-like mixture. The influence of addition of the heavy rare earth element into the NdFe magnet on the magnetization strength, the maximum energy product and the production cost is effectively improved; the stabilities of the coercive force and the temperature are improved; the production cost and the application cost of the heavy rare earth element are reduced.

Description

[0001] technical field [0002] The invention relates to a neodymium-iron-boron permanent magnet, a preparation method and application thereof, in particular to a neodymium-iron-boron system heat-deformable magnet with enhanced coercive force, a preparation method and application thereof. [0003] Background technique [0004] NdFeB magnets are intermetallic compounds composed of rare earth elements R, iron and boron. R is mainly neodymium or a combination of neodymium and other rare earth elements, and sometimes cobalt, aluminum, vanadium and other elements are used to replace part of iron. NdFeB magnets have strong magnetocrystalline anisotropy and high saturation magnetization, and their representative magnet composition is Nd15Fe77B8 (atomic ratio). Among permanent magnet materials, sintered Nd-Fe-B magnets have the highest performance, and the maximum magnetic energy product (BH) max=360kJ / m of commercial products 3 , The intrinsic coercive force iHc reaches 800-1400...

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): H01F1/057H01F1/08H01F41/02B22F3/04B22F3/16C21D1/18
Inventor 王会杰胡元虎张元宏王涌陈咪珍
Owner 宁波金鸡强磁股份有限公司
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