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

R-T-B series permanent magnet material, raw material composition and preparation method and application thereof

A technology of R-T-B and raw material composition, applied in the direction of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problem of expensive Co

Active Publication Date: 2020-09-01
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
View PDF10 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the technical problem that R-T-B series permanent magnet materials in the prior art increase the Curie temperature and coercive force by adding Co, and Co faces the defect of expensive price, and provides a R-T-B Permanent magnetic material, raw material composition, preparation method and application thereof

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
  • R-T-B series permanent magnet material, raw material composition and preparation method and application thereof
  • R-T-B series permanent magnet material, raw material composition and preparation method and application thereof
  • R-T-B series permanent magnet material, raw material composition and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8 and comparative example 1-5

[0169] The preparation method of R-T-B series permanent magnet material in embodiment 1-8 and comparative example 1-5 is as follows:

[0170] (1) Melting and casting process: According to the formula in Table 1, the prepared raw materials were put into an alumina crucible, and vacuum melting was carried out in a high-frequency vacuum melting furnace at a vacuum of 0.05 Pa and 1500°C. Argon gas is introduced into the intermediate frequency vacuum induction quick-setting belt furnace for casting, and then the alloy is quenched to obtain alloy sheets.

[0171] (2) Hydrogen crushing process: Vacuumize the hydrogen crushing furnace where the quenched alloy is placed at room temperature, and then pass hydrogen gas with a purity of 99.9% into the hydrogen crushing furnace to maintain the hydrogen pressure at 90kPa. After fully absorbing hydrogen , heat up while vacuuming, fully dehydrogenate, then cool, and take out the powder after hydrogen crushing. Wherein, the temperature of hyd...

Embodiment 9

[0177] The sintered body obtained through sintering treatment in Example 4 was first subjected to grain boundary diffusion treatment, and then to aging treatment. All the other steps are the same as in Example 4. The grain boundary diffusion treatment process is as follows:

[0178] The sintered body is processed into a 20mm×20mm magnet with a sheet thickness of less than 7mm. The thickness direction is the orientation direction of the magnetic field. After the surface is cleaned, the raw materials prepared by Dy fluoride are used to spray and coat the magnet on the whole surface. The final magnet was dried, and then diffusely heat-treated at 850°C for 24 hours in a high-purity Ar atmosphere. Cool to room temperature.

Embodiment 10

[0180] The sintered body obtained through sintering treatment in Example 2 was first subjected to grain boundary diffusion treatment, and then to aging treatment. All the other steps are the same as in Example 2. The grain boundary diffusion treatment process is as follows:

[0181] The sintered body is processed into a 20mm×20mm magnet with a sheet thickness of less than 7mm. The thickness direction is the orientation direction of the magnetic field. After the surface is cleaned, the raw materials prepared by Tb fluoride are used to spray and coat the magnet on the whole surface. The final magnet was dried, and then diffusely heat-treated at 850°C for 24 hours in a high-purity Ar atmosphere. Cool to room temperature.

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
Bending strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses an R-T-B series permanent magnet material, a raw material composition and a preparation method and application thereof. The raw material composition of the R-T-B series permanent magnet material comprises the following components in percentage by mass: 29.5-32% of R which is a rare earth element at least containing Nd, whereinthe content of Pr is 0-17%; 0.15-0.50% Zr; 0-0.08% of Cu, wherein Cu is not 0 or 0.08; 0-0.3% of M, wherein M is one or more of Al, Ga, Ti, Nb, Hf, Si, Sn, Ge, Ag, Au, Bi and Mn; 0.95-1.05% of B; and 64-70% of Fe, wherein the percentage is the masspercentage accounting for the total mass of the raw material composition of the R-T-B series permanent magnet material, and the sum of the contents of all the components is 100%. The R-T-B series permanent magnet material has the advantages of being good in squareness, good in high-temperature performance and excellent in mechanical performance.

Description

technical field [0001] The invention relates to an R-T-B series permanent magnet material, a raw material composition, a preparation method and application thereof. Background technique [0002] Nd-Fe-B permanent magnet material with Nd 2 Fe l4 B compound as the matrix has the advantages of high magnetic properties, small thermal expansion coefficient, easy processing and low price. Since its inception, it has grown at an average annual rate of 20-30%, becoming the most widely used permanent magnet material. According to the preparation method, Nd-Fe-B permanent magnets can be divided into three types: sintering, bonding and hot pressing, among which sintered magnets account for more than 80% of the total output and are the most widely used. [0003] In the prior art, Co is the most used and most effective element when making heat-resistant and corrosion-resistant sintered Nd-Fe-B magnets. This is because the addition of Co can reduce the reversible temperature coefficien...

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): H01F1/057H01F41/02C22C33/02C22C38/00C22C38/02C22C38/04C22C38/06C22C38/10C22C38/12C22C38/14C22C38/16
CPCH01F1/0576H01F1/0577H01F41/0253H01F41/0266H01F41/0293C22C38/005C22C38/002C22C38/14C22C38/16C22C38/10C22C38/06C22C38/12C22C38/02C22C38/008C22C38/007C22C38/04C22C33/0278
Inventor 蓝琴黄佳莹张艳艳
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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