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A kind of NdFeB permanent magnet material and preparation method thereof

A permanent magnet material, neodymium iron boron technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of magnetic and mechanical properties that cannot meet the requirements, low mechanical strength, low product yield, etc., to achieve Suitable for mass production, uniform crystal grains, and improved magnetic and mechanical properties

Active Publication Date: 2020-04-17
DONGGUAN JINCONN NEW MATERIAL CO LTD
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  • 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 permanent magnet materials have poor process controllability, low product yield, and poor magnetic properties. The energy and mechanical properties cannot meet the requirements, which limits its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this embodiment, a kind of NdFeB permanent magnet material comprises the following raw materials in mass percentage:

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

[0034] In this embodiment, a method for preparing an NdFeB permanent magnet material comprises the following steps:

[0035] (1) Raw materials other than graphene, copper, and aluminum are taken in proportion, the ingot is melted, the ingot is heat-treated, and the heat-treated ingot is crushed by hydrogen explosion crushing, then hydrogen is absorbed and dehydrogenated, and then air-flow milling is used powder to obtain NdFeB alloy powder; the particle size of the NdFeB alloy powder is 1-3 μm;

[0036] (2) the graphene is a nano-graphene sheet, copper is a nano-copper powder, and aluminum is a nano-aluminum powder; get a nano-graphene sheet, a nano-copper powder, and a nano-a...

Embodiment 2

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

[0046] A neodymium iron boron permanent magnet material, comprising the following raw materials in mass percentage:

[0047] 24.15% neodymium, 1.01% boron, 7.5% praseodymium, 0.8% aluminum, 0.55% dysprosium, 0.25% gallium, 0.13% copper, 0.13% zirconium, 1% graphene, 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 pressing treatment is 220MPa, and the treatment time is 90s.

[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, and the third stage The tempering heat treatment ...

Embodiment 3

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

[0054] In this embodiment, a kind of NdFeB permanent magnet material comprises the following raw materials in mass percentage:

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

[0056] A preparation method of NdFeB permanent magnet material, comprising the following steps:

[0057] (1) Raw materials other than graphene, copper, and aluminum are taken in proportion, the ingot is melted, the ingot is heat-treated, and the heat-treated ingot is crushed by hydrogen explosion crushing, then hydrogen is absorbed and dehydrogenated, and then air-flow milling is used powder to obtain NdFeB alloy powder; the particle size of the NdFeB alloy powder is 1-3 μm;

[0058] (2) described graphene is nano-graphene sheet, and copper is nano-copper powder, and aluminum is nano-aluminum powder; Under gas ...

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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

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Application Information

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Patent Type & Authority Patents(China)
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
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