Unlock instant, AI-driven research and patent intelligence for your innovation.

A preparation method for improving the magnetic properties of high-abundance rare earth permanent magnet materials

A rare-earth permanent magnet and rare-earth permanent magnet technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve problems such as the decrease of saturation magnetization of raw material costs, achieve a significant increase in coercivity, reduce production costs, Improve the effect of demagnetization coupling

Active Publication Date: 2017-09-15
UNIV OF SCI & TECH BEIJING
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of a sharp increase in raw material costs and a sharp drop in saturation magnetization caused by the addition of Dy / Tb heavy rare earths in the prior art

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment one: N38 magnet (Ce accounts for 20% weight fraction of rare earth content) grain boundary infiltration (Pr75Dy25) 80 (Al20Cu80) 20 (weight fraction)

[0021] Select N38 commercial magnet (Ce accounts for 20% weight fraction of rare earth content), processed into a size of sample. Prepare a thin strip with a thickness of (Pr75Dy25)80(Al20Cu80)20 through the quick-setting process, directly cover the upper and lower surfaces of the N38 magnet and place it in the material boat, place the material boat in the furnace, and evacuate to (3-5)× 10 -3 Pa, start rapid heating to 860°C, hold for 5h, and then undergo vacuum annealing heat treatment at 470°C / 2h. The coercive force of the magnet increases from less than 11.0kOe before the infiltration of the grain boundary to nearly 17.0kOe after the infiltration, while the remanence hardly decreases. The observation of the structure shows that the distribution of the grain boundary phase is more uniform and basically...

Embodiment 2

[0022] Embodiment two: N35 magnet (Ce accounts for 30% weight fraction of rare earth content) grain boundary infiltration (Nd75Dy25) 70 (Al5Cu95) 30 (weight fraction)

[0023] Select N35 commercial magnet (Ce accounts for 30% weight fraction of rare earth content), processed into a size of sample. Prepare a thin strip with a thickness of (Nd75Dy25)70(Al5Cu95)30 through the quick-setting process, directly cover the upper and lower surfaces of the N35 magnet and place it in the material boat, place the material boat in the furnace, and evacuate to (3-5)× 10 -3 Pa, start rapid heating to 860°C, hold for 5h, and then undergo vacuum annealing heat treatment at 470°C / 2h. The coercive force of the magnet increases from less than 12.0kOe before the infiltration of the grain boundary to nearly 18kOe after the infiltration, while the remanence hardly decreases. The observation of the structure shows that the distribution of the grain boundary phase is more uniform, basically distri...

Embodiment 3

[0024] Embodiment three: N28 magnet (Ce accounts for 50% weight fraction of rare earth content) grain boundary diffusion (Nd50Pr25Dy25)75 (Al10Cu90)25 (weight fraction)

[0025] Select N28 commercial magnet (Ce accounts for 50% weight fraction of rare earth content), processed into a size of sample. Prepare a thin strip with a thickness of (Nd50Pr25Dy25)75(Al10Cu90)25 through the quick-setting process, directly cover the upper and lower surfaces of the N28 magnet and place it in the material boat, place the material boat in the furnace, and evacuate to (3-5)× 10 -3Pa, start rapid heating to 850°C, hold for 4h, and then undergo vacuum annealing heat treatment at 450°C / 2h. The coercive force of the magnet increases from less than 9kOe before the infiltration of the grain boundary to nearly 15kOe after the infiltration, while the remanence hardly decreases. The observation of the structure shows that the distribution of the grain boundary phase is more uniform, basically dis...

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 provides a preparation method capable of improving the magnetic property of a high-abundance rare-earth permanent magnet material, and belongs to the field of preparation of rare-earth permanent magnet materials. The method is characterized in that grain boundary diffusion-permeation is carried out on the high-abundance rare-earth permanent magnet material; and the ingredient of a diffusion-permeation source is (Nd<x>Pr<100-x>)(Dy<y>Tb<100-y>)(Al<z>Cu<100-z>)<100-a-b> (x=0-100, y=0-100, z=5-30; a+b=60-90, b is greater than or equal to 5 and smaller than a, weight fraction). The method comprises the specific process steps of: carrying out vacuum melting on a diffusion-permeation source alloy; fabricating the diffusion-permeation alloy into thin strips or powder and making the strips or the powder attached to the surface of a high-abundance rare-earth permanent magnet; and carrying out diffusion treatment in a vacuum furnace at 600-900 DEG C for 1-8 hours and then carrying out annealing treatment at 450-550 DEG C for 1-5 hours. The method has the advantages that distribution of a grain boundary phase can be improved and the demagnetization coupling effect can be improved by grain boundary diffusion-permeation of a small amount of composite heavy rare-earth-copper aluminum alloy; the intrinsic property can also be improved; and the improvement effect on the magnetic property, particularly the coercivity is obvious.

Description

technical field [0001] The invention belongs to the field of preparation of rare earth permanent magnet materials, in particular to a preparation method for improving the magnetic properties of high-abundance rare earth permanent magnet materials. technical background [0002] Since the advent of NdFeB permanent magnet materials in the 1980s, it has effectively promoted the development of modern science and technology and the information industry in the direction of integration, miniaturization, light weight, and intelligence. Sintered NdFeB is widely used in computer hard disk voice coil motor (VCM), magnetic resonance imaging (MRI), consumer electronics (CD, DVD, mobile phone, audio, copier, scanner, video camera, camera, refrigerator, TV, air conditioner Machines, etc.), magnetic separation equipment and other fields, and continue to expand, such as wind power, electric vehicles, etc. [0003] Relying on the resource advantages of rare earths, China's sintered NdFeB tech...

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 Patents(China)
IPC IPC(8): H01F41/02
CPCH01F41/0293
Inventor 包小倩高学绪汤明辉卢克超孙璐
Owner UNIV OF SCI & TECH BEIJING