Neodymium iron boron permanent magnet material and preparation method thereof

A permanent magnet material, NdFeB technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of magnetic properties and mechanical properties that cannot meet the requirements, low mechanical strength, and low product yield, etc. It is suitable for mass production, uniform grains, and the effect of improving magnetic properties and mechanical properties

Active Publication Date: 2018-08-03
DONGGUAN JINCONN NEW MATERIAL CO LTD
View PDF7 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, most of the existing NdFeB permanent magnet materials have poor corrosion resistance, low mechanical strength, and poor processability, and the preparation methods of the existing NdFeB pe

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

Example Embodiment

[0031] Example 1

[0032] In this embodiment, a neodymium iron boron permanent magnet material includes the following mass percentage of raw materials:

[0033] Neodymium 21.85%, boron 0.91%, praseodymium 8.5%, aluminum 0.6%, dysprosium 0.65%, gallium 0.15%, copper 0.17%, zirconium 0.11%, graphene 6%, and the balance is iron.

[0034] In this embodiment, a method for preparing a neodymium iron boron permanent magnet material includes the following steps:

[0035] (1) Take raw materials other than graphene, copper and aluminum according to the proportion, smelt the ingot, heat the ingot, crush the heat-treated ingot with hydrogen explosion crushing, absorb hydrogen and dehydrogenate, and then use jet milling Powder to obtain NdFeB alloy powder; the particle size of the NdFeB alloy powder is 1-3 μm;

[0036] (2) The graphene is nano-graphene sheet, copper is nano-copper powder, and aluminum is nano-aluminum powder; take nano-graphene sheet, nano-copper powder, nano-aluminum powder, neody...

Example Embodiment

[0044] Example 2

[0045] The difference between this embodiment and Embodiment 1 is:

[0046] A neodymium iron boron permanent magnet material, including the following mass percentages of raw materials:

[0047] Neodymium 24.15%, boron 1.01%, praseodymium 7.5%, aluminum 0.8%, dysprosium 0.55%, gallium 0.25%, copper 0.13%, zirconium 0.13%, graphene 1%, and the balance is iron.

[0048] Preferably, in the step (1), the heat treatment temperature of the ingot is 850°C.

[0049] Preferably, in the step (3), the mixture obtained in the step (2) is oriented in a force magnetic field of 2.8T.

[0050] Preferably, in the step (4), the pressure of the isostatic treatment is 220 MPa, and the treatment time is 90 s.

[0051] Preferably, in the step (4), the temperature of the first-stage tempering heat treatment is 980°C, the holding time is 2.0h, the temperature of the second-stage tempering heat treatment is 700°C, and the holding time is 1.5h, The tempering heat treatment temperature is 600℃, a...

Example Embodiment

[0052] Example 3

[0053] The difference between this embodiment and Embodiment 1 is:

[0054] In this embodiment, a neodymium iron boron permanent magnet material includes the following mass percentages of raw materials:

[0055] Neodymium 23.0%, praseodymium 8.0%, boron 0.96%, aluminum 0.7%, dysprosium 0.6%, gallium 0.2%, copper 0.15%, zirconium 0.12%, graphene 5%, and the balance is iron.

[0056] A preparation method of neodymium iron boron permanent magnet material includes the following steps:

[0057] (1) Take raw materials other than graphene, copper, and aluminum in proportion, smelt the ingot, heat the ingot, crush the heat-treated ingot with hydrogen explosion crushing, absorb hydrogen and dehydrogenate, and then use jet milling Powder to obtain NdFeB alloy powder; the particle size of the NdFeB alloy powder is 1-3 μm;

[0058] (2) The graphene is nano-graphene sheet, copper is nano-copper powder, and aluminum is nano-aluminum powder; take nano-graphene sheet, nano-copper pow...

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
Maximum energy productaaaaaaaaaa
Coercivityaaaaaaaaaa
Login to view more

Abstract

The invention relates to the technical field of permanent magnet materials, in particular to a neodymium iron boron permanent magnet material and a preparation method thereof. The neodymium iron boronpermanent magnet material is prepared from, by mass, 21.85%-24.15% of neodymium, 0.91%-1.01% of boron, 7.5%-8.5% of praseodymium, 0.6%-0.8% of aluminum, 0.55%-0.65% of dysprosium, 0.15%-0.25% of gallium,0.13%-0.17% of copper, 0.11%-0.13% of zirconium, 1%-6% graphene and the balance iron. The preparation method of the material comprises the steps that raw materials except graphene, copper and aluminum are subject to smelting and ingot casting in advance and then are proportionally mixed with nano copper powder, nano aluminum powder and nano graphene sheets, the mixture is put in an oriented magnetic field for pressing and formation, and sintering is performed after isostatic pressing. The preparation method is simple in process, easy to control, the product performance is superior, the product quality is stable, and the prepared neodymium iron boron permanent magnet material is good in corrosivity, high in mechanical strength and good in machinability.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to an NdFeB permanent magnet material and a preparation method thereof. Background technique [0002] As the third-generation rare earth permanent magnet material, NdFeB magnets are widely used in energy, transportation, machinery, medical, IT, home appliances and other industries. With the advancement of science and technology, the performance of NdFeB functional materials has been continuously improved, bringing new uses, which brings a broader market prospect for the NdFeB industry. [0003] However, most of the existing NdFeB permanent magnet materials have poor corrosion resistance, low mechanical strength, and poor processability, and the preparation methods of the existing NdFeB permanent magnet materials have poor process controllability, low product yield, and poor magnetic properties. The energy and mechanical properties cannot meet the requirements, wh...

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): H01F1/057H01F1/08C22C38/06C22C38/16C22C38/14
CPCC22C38/002C22C38/005C22C38/06C22C38/14C22C38/16H01F1/0577
Inventor 陈亮
Owner DONGGUAN JINCONN NEW MATERIAL CO LTD
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