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nd-fe-b thin strip magnet and its preparation method

A nd-fe-b, thin strip technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve other problems such as performance degradation, performance theoretical values ​​are far apart, research inconvenience, etc., to achieve good results The effect of hard magnetic properties

Inactive Publication Date: 2019-03-12
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: provide Nd-Fe-B thin strip magnet and its preparation method, the elemental composition general formula of this Nd-Fe-B thin strip magnet is Nd a Fe b B c Cr d co e Si f Mo g Ti h , by adding different amounts of Fe-Cr-Co alloys in the Nd-Fe-B alloy composition, which is equivalent to the Nd-F e In -B alloy, multi-element composite addition of F is regular e -Cr-Co alloy composition elements, the general formula of the prepared element composition is Nd a Fe b B c Cr d co e Si f Mo g Ti h The Nd-Fe-B thin strip magnet overcomes the existing technology that after adding a single element, while improving one or a limited number of properties of the magnet material, it often leads to the reduction or change of other properties, so that the performance is relatively low. Theoretical values ​​are far apart, and when adding multiple elements at the same time, there are no rules to follow, which brings inconvenience to subsequent research.

Method used

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Experimental program
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Effect test

Embodiment 1

[0038] The first step, raw material preparation:

[0039] According to the content of each constituent element after adding Fe-Cr-Co alloy to Nd-Fe-B alloy, calculate the atomic percentage of each constituent element in the alloy, use Nd 11.35 Fe 81.54 B 5.68 Cr 0.95 co 0.40 Si 0.07 Mo 0.01 Ti 0.01 Expressed, and then calculate the Nd according to the atomic percentage 11.35 Fe 81.54 B 5.68 Cr 0.95 co 0.40 Si 0.07 Mo 0.01 Ti 0.01 The mass percentage of each constituent element in the formula is weighed according to the calculated mass percentage of the component raw materials pure Nd, pure Fe, pure Cr, pure Co, pure Si, pure Mo, pure Ti and Fe-B alloy, thus completing the raw material For preparation, Fe-B alloy is used as raw material for B in the above-mentioned component raw materials, and the content of B in the Fe-B alloy is 18-21% (mass percentage);

[0040] The second step is to melt the raw materials to prepare master alloy ingots:

[0041] Put all the ...

Embodiment 2

[0052] The first step, raw material preparation:

[0053] With embodiment 1;

[0054] The second step is to melt the raw materials to prepare master alloy ingots:

[0055] With embodiment 1;

[0056] The third step, preparation of Nd-Fe-B thin strip magnet:

[0057] The Nd obtained in the second step 11.35 Fe 81.54 B 5.68 Cr 0.95 co 0.40 Si 0.07 Mo 0.01 Ti 0.01 The master alloy ingot is loaded into the melt quenching furnace, and after remelting, the melt is quenched on the cooling molybdenum roller rotating at a peripheral speed of 5m / s, thereby producing Nd with a thickness of 80μm 11.35 Fe 81.54 B 5.68 Cr 0.95 co 0.40 Si 0.07 Mo 0.01 Ti 0.01 Nd-Fe-B thin strip magnets;

[0058] The fourth step, the preparation of Nd-Fe-B thin strip magnet products:

[0059] The Nd prepared in the third step 11.35 Fe 81.54 B 5.68 Cr 0.95 co 0.40 Si 0.07 Mo 0.01 Ti 0.01 The Nd-Fe-B thin strip magnet is annealed in a vacuum annealing furnace. During annealing, the fu...

Embodiment 3

[0061] The first step, raw material preparation:

[0062] With embodiment 1;

[0063] The second step is to melt the raw materials to prepare master alloy ingots:

[0064] With embodiment 1;

[0065] The third step, preparation of Nd-Fe-B thin strip magnet:

[0066] The Nd obtained in the second step 11.35 Fe 81.54 B 5.68 Cr 0.95 co 0.40 Si 0.07 Mo 0.01 Ti 0.01 The master alloy ingot is loaded into a melt quenching furnace, and after remelting, melt quenching is carried out on a cooling molybdenum roller rotating at a peripheral speed of 20m / s, thereby producing Nd with a thickness of 50μm 11.35 Fe 81.54 B 5.68 Cr 0.95 co 0.40 Si 0.07 Mo 0.01 Ti 0.01 Nd-Fe-B thin strip magnets;

[0067] The fourth step, the preparation of Nd-Fe-B thin strip magnet products:

[0068] The Nd prepared in the third step 11.35 Fe 81.54 B 5.68 Cr 0.95 co 0.40 Si 0.07 Mo 0.01 Ti 0.01 The Nd-Fe-B thin strip magnet is annealed in a vacuum annealing furnace. During annealing, ...

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Abstract

The invention provides an Nd-Fe-B ribbon magnet and a preparation method for the same and relates to a rare-earth-iron-based permanent magnet alloy. A general formula of composition elements of the Nd-Fe-B ribbon magnet is NdaFebBcCrdCoeSifMogTih; Fe-Cr-Co alloy of various amounts is added to the Nd-Fe-B alloy, which being equal to add multi-component Fe-Cr-Co alloy to the Nd-Fe-B alloy in a regular way; and an Nd-Fe-B ribbon magnet with the general formula of component element of NdaFebBcCrdCoeSifMogTih can be prepared by the method. A deficiency in the prior art can be overcome that after a single element is added, other performance is reduced or changed and further performance is way lower than a theoretical value when one or a limited number of performance of the magnet material is improved; and also, a deficiency of inconvenient post-research due to the lack of rules when various elements are added can be overcome.

Description

technical field [0001] The technical scheme of the invention relates to a rare earth iron-based permanent magnet alloy, specifically a Nd-Fe-B thin-strip magnet and a preparation method thereof. Background technique [0002] NdFeB permanent magnet is currently the magnetic material with the best comprehensive magnetic properties in the world, and it is cost-effective and has a wide range of applications. It has wide application value in the fields of automobile industry, computer technology, aerospace, automation technology, instrument technology, wind power generation technology, microwave communication technology and so on. [0003] Reasonable addition of other elements is a very effective means to improve the microstructure and magnetic properties of NdFeB permanent magnet materials, and there are already a large number of experimental data to prove this point. Wang et al. (Wang W, Ni J S, XuH, et al. Effect of Cr on the magnetic properties and microstructure of Nd 2 Fe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C22C38/32C22C38/30C22C38/02C22C38/22C22C38/28
CPCC22C38/005C22C38/02C22C38/22C22C38/28C22C38/30C22C38/32H01F1/0571H01F1/0577
Inventor 孙继兵刘帅步绍静殷福星张磊
Owner HEBEI UNIV OF TECH
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