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

Method for improving magnetic performance of Y-based sintered magnet

A technology of sintered magnets and magnetic properties, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problem of limited improvement of the magnetic anisotropy of the main phase grains.

Inactive Publication Date: 2017-09-08
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the shell structure directly formed in the main phase grains by adding Y, the difference between the content of NdPr element in the shell layer and the core is only about 1wt.%, which can improve the magnetic anisotropy of the main phase grains limited

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
  • Method for improving magnetic performance of Y-based sintered magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) NdH with a particle size of less than 0.5 μm 3 The alloy powder and ethanol are mixed according to the mass ratio of 1:1, and stirred with a glass rod to completely blend the alloy powder and the organic solvent;

[0028] (2) Disperse the mixed solution obtained in step (1) for 30 minutes under 50W ultrasonic to obtain a diffusion alloy suspension;

[0029] (3) The nominal component is [Nd 0.5 (Ce 0.35 Y 0.15 )] 30.5 Al 0.1 Cu 0.1 Fe 68.3 B 1 The Y-based sintered magnet is completely submerged in the suspension obtained in step (2), and then taken out so that the surface of the magnet is covered with a layer of suspension;

[0030] (4) Place the magnet covered with the suspension in a cool place and wait for it to dry;

[0031] (5) Place the magnet whose surface is covered with the alloy to be diffused obtained in step (4) in a vacuum sintering furnace. -3 Pa, thermal diffusion treatment at a diffusion heat temperature of 900°C for 4 hours to obtain a ther...

Embodiment 2

[0034] (1) PrH with particle size less than 0.5 μm 3 The alloy powder and ethanol are mixed according to the mass ratio of 1:1, and stirred with a glass rod to completely blend the alloy powder and the organic solvent;

[0035] (2) Disperse the mixed solution obtained in step (1) for 30 minutes under 50W ultrasonic to obtain a diffusion alloy suspension;

[0036] (3) The nominal component is [Nd 0.5 (Ce 0.35 Y 0.15 )] 30.5 Al 0.1 Cu 0.1 Fe 68.3 B 1 The Y-based sintered magnet is completely submerged in the suspension obtained in step (2), and then taken out so that the surface of the magnet is covered with a layer of suspension;

[0037] (4) Place the magnet covered with the suspension in a cool place and wait for it to dry;

[0038] (5) Place the magnet whose surface is covered with the alloy to be diffused obtained in step (4) in a vacuum sintering furnace. -3 Pa, thermal diffusion treatment at a diffusion heat temperature of 900°C for 4 hours to obtain a thermal d...

Embodiment 3

[0041] (1) NdF with particle size less than 0.5μm 3 The alloy powder and ethanol are mixed according to the mass ratio of 1:1, and stirred with a glass rod to completely blend the alloy powder and the organic solvent;

[0042] (2) Disperse the mixed solution obtained in step (1) for 30 minutes under 50W ultrasonic to obtain a diffusion alloy suspension;

[0043] (3) The nominal component is [Nd 0.5 (Ce 0.35 Y 0.15 )] 30.5 Al 0.1 Cu 0.1 Fe 68.3 B 1The Y-based sintered magnet is completely submerged in the suspension obtained in step (2), and then taken out so that the surface of the magnet is covered with a layer of suspension;

[0044] (4) Place the magnet covered with the suspension in a cool place and wait for it to dry;

[0045] (5) Place the magnet whose surface is covered with the alloy to be diffused obtained in step (4) in a vacuum sintering furnace. -3 Pa, thermal diffusion treatment at a diffusion heat temperature of 900°C for 4 hours to obtain a thermal dif...

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
Login to View More

Abstract

The invention provides a method for improving magnetic performance of a Y-based sintered magnet. The method comprises the steps of firstly, uniformly mixing Pr or / and Nd element-containing alloy powder to be diffused with an organic solvent to obtain an alloy liquid to be diffused; secondly, attaching the alloy liquid to be diffused onto a surface of the Y-based sintered magnet; thirdly, placing the Y-based sintered magnet in a vacuum sintering furnace for performing grain boundary diffusion heat treatment so that a Pr or / and Nd element is diffused and enters a main phase grain surface layer of the Y-based sintered magnet; and finally, performing tempering. By the method, the magnetocrystalline anisotropy field of the main phase grain surface layer is improved, reverse nucleation of the grain surface layer during the reverse magnetization process is prevented, the performance such as residual magnetism, maximum magnetic energy product and coercivity of the Y-based sintered magnet is improved, and the high-performance Y-based sintered magnet is obtained.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, in particular to a method for improving the performance of Y-based rare earth permanent magnets. Background technique [0002] The rare earth NdFeB permanent magnet material was developed in the early 1980s. It is known as the "Magnetic King" because of its extremely high coercive force, maximum magnetic energy product, and excellent comprehensive performance. Since its inception, it has been widely used in various industries of the national economy such as instrumentation, microwave communications, wind power generation, electric vehicles, and electronic information. With the rapid development of human society, the annual output of rare earth permanent magnets in the world has reached about 150,000 tons in 2016, and it shows a strong growth trend. Since NdFeB permanent magnets contain about 30wt.% of rare earth elements, the consumption of rare earth elements is increasing y...

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): H01F1/057H01F1/08H01F41/02C22C33/02C22C38/10C22C38/16C22C38/12C22C38/14C22C38/06C22C38/60
CPCH01F1/0571C22C33/0278C22C38/002C22C38/005C22C38/008C22C38/06C22C38/10C22C38/12C22C38/14C22C38/16C22C38/60H01F1/0577H01F41/0293
Inventor 范晓东郭帅丁广飞陈侃陈仁杰闫阿儒李东
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI