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VC-added sintered rare-earth permanent magnet material and preparation method thereof

A rare earth permanent magnet and sintered magnet technology, applied in the direction of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve problems such as grain coarsening, achieve small grain size, improve magnet density, comprehensive magnetic excellent effect

Active Publication Date: 2018-10-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies in the prior art, to provide a sintered rare earth permanent magnet material with added VC and its preparation method, so as to overcome the problem of grain coarsening in the sintering process of the rare earth permanent magnet material RE-Fe-B magnet , to further improve the comprehensive performance of rare earth permanent magnet materials

Method used

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  • VC-added sintered rare-earth permanent magnet material and preparation method thereof
  • VC-added sintered rare-earth permanent magnet material and preparation method thereof
  • VC-added sintered rare-earth permanent magnet material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] The sintered rare earth permanent magnet material prepared in this embodiment has the chemical formula of Nd 29.89 Fe 63.62 co 4.93 Ga 0.64 B 0.92 The magnet is composed of vanadium carbide, and the process steps are as follows:

[0047] (1) Ingredients

[0048] Dosing according to the chemical formula of the above-mentioned magnets, and remove the oxides and impurities on the surface of the raw materials;

[0049] (2) Casting

[0050] Put the prepared raw materials in step (1) into a vacuum induction melting furnace and melt them under the condition of high-purity argon gas. Quick-setting alloy cast sheet with a thickness of 0.25mm;

[0051] (3) Preparation of magnetic powder

[0052] Put the alloy cast sheet obtained in step (2) into a rotary hydrogen explosion furnace for hydrogen crushing treatment to obtain coarsely crushed alloy particles with a particle size of 10-300 μm, and carry out jet mill crushing of the obtained alloy coarsely crushed particles und...

Embodiment 2

[0068] The sintered rare earth permanent magnet material prepared in this embodiment has the chemical formula of Nd 32.92 Fe 65.07 co 1.0 B 1.01 The magnet is composed of vanadium carbide, and the process steps are as follows:

[0069] (1) Ingredients

[0070] Dosing according to the chemical formula of the above-mentioned magnets, and remove the oxides and impurities on the surface of the raw materials;

[0071] (2) Casting

[0072] Put the raw materials prepared in step (1) into a vacuum induction melting furnace and melt them under the condition of high-purity argon. After melting, pour the alloy liquid on a water-cooled copper roller with a linear speed of 3.5m / s, and then quickly cool it to obtain Quick-setting alloy cast sheet with an average thickness of 0.22mm;

[0073] (3) Preparation of magnetic powder

[0074] Put the alloy cast sheet obtained in step (2) into a rotary hydrogen explosion furnace for hydrogen crushing treatment to obtain coarsely crushed alloy...

Embodiment 3

[0090] The sintered rare earth permanent magnet material prepared by the present embodiment has the chemical formula of (Nd, Pr) 32.52 Fe 65.08 co 0.79 B 0.71 Ga 0.2 al 0.4 Cu 0.3 The magnet is composed of vanadium carbide, and the process steps are as follows:

[0091] (1) Ingredients

[0092] Dosing according to the chemical formula of the above-mentioned magnets, and remove the oxides and impurities on the surface of the raw materials;

[0093] (2) Casting

[0094] Put the prepared raw materials in step (1) into a vacuum induction melting furnace and melt them under the condition of high-purity argon gas. Quick-setting alloy cast sheet with a thickness of 0.25mm;

[0095] (3) Preparation of magnetic powder

[0096] Put the alloy cast sheet obtained in step (2) into a rotary hydrogen explosion furnace for hydrogen crushing treatment to obtain coarsely crushed alloy particles with a particle size of 10-300 μm, and carry out jet mill crushing of the obtained alloy co...

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Abstract

The invention discloses a VC-added sintered rare-earth permanent magnet material. The sintered rare-earth permanent magnet material comprises a magnet with a chemical formula of REFe<100-a-b-c>BTm<c> and vanadium carbide, wherein the content of vanadium carbide is 0.05-0.50mass% of the REFe<100-a-b-c>BTm<c> magnet, wherein a is greater than or equal to 27 and less than or equal to 36.5; b is greater than or equal to 0.9 and less than or equal to 1.1; c is greater than or equal to 0.1 and less than or equal to 6; RE is at least one kind of Pr, Nd, Ce and La; and Tm is at least one kind of Co, Cu, Al, Ga and Nb. The invention further provides a preparation method of the rare-earth permanent magnet material. The preparation method comprises the steps of ball milling and mixing, preparing a magnetic field forming green body, carrying out cold isostatic pressing, sintering and performing heat treatment. According to the method disclosed by the invention, grain growth is inhibited through VC and a low-pressure sintering process is combined, so that the problem of grain coarsening of the rare-earth permanent magnet material RE-Fe-B magnet in the sintering process can be overcome, and the comprehensive magnetic property of the rare-earth permanent magnet material is further improved.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, and relates to a sintered rare earth permanent magnet material added with VC and a preparation method thereof. Background technique [0002] Nd-Fe-B permanent magnet materials have excellent comprehensive hard magnetic properties such as high residual magnetization, high coercive force and high magnetic energy product, and are used in low-carbon wind power generation, hybrid electric vehicles / pure electric vehicles and energy-saving home appliances. It has been widely used in the economic field. Due to various complex service environments and working conditions, higher requirements are placed on the comprehensive performance of Nd-Fe-B magnets, especially the demand for NdFeB magnets with high coercive force and high thermal stability. [0003] At present, the improvement of coercive force in the preparation research of sintered NdFeB is mainly realized by adding su...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02C22C33/02
CPCC22C33/0278H01F1/0577H01F41/0253H01F41/0266
Inventor 刘颖李军赵伟黄建昕
Owner SICHUAN UNIV
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