R-Fe-B series permanent magnet and production method thereof

A production method and technology for permanent magnets, which are applied to magnetic objects, permanent magnets, magnetic materials, etc., can solve the problem of uneven concentration distribution of rare earth elements dysprosium or terbium, and achieve the effect of improving grain boundary phase and improving magnetic properties.

Active Publication Date: 2013-02-20
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method puts forward higher requirements on the thickness of the magnet, and the concentration distribution of the rare earth element dysprosium or terbium in the grain boundary of the whole magnet is not uniform.

Method used

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  • R-Fe-B series permanent magnet and production method thereof
  • R-Fe-B series permanent magnet and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative Embodiment 1

[0043]31% Nd, 68.3% Fe, 0.5% by mass by using at least 99% pure Nd, Al, Fe, Cu and ferroboron in an argon atmosphere for high-frequency melting, and pouring the melt onto a chilled roll Alloy of Al, 0.2% Cu, 1% B. The alloy is hydrogenated and pulverized into a coarse powder of 0.05-1 mm, and the coarse powder is ball-milled to 150-200 μm, and then the ball-milled powder is jet-milled to obtain a magnetic powder of 3-6 μm. Add the KH151 silane coupling agent to the magnetic powder, and stir at a high speed of 1800 r / min for 30 minutes so that the magnetic powder and the coupling agent are fully mixed and ready for use. Dysprosium ethoxide was added to the surface-coupled magnetic powder, and stirred at a high speed of 1800 rpm for 30 minutes to fully mix the magnetic powder and the dysprosium-containing organic matter. Wherein, the addition amount of the silane coupling agent is 1wt% of the NdFeB magnetic powder. Dysprosium content in organic matter accounts for 0.8wt% of Nd...

Embodiment 2 and comparative Embodiment 2

[0048] The mass percentage of 33% Nd-Pr is made by using at least 99% weight purity Nd-Pr (80% Nd) alloy, Fe and boron iron in an argon atmosphere for high-frequency melting, and pouring the melt onto a quenching roll , 66% Fe, 1% B alloy. The process for preparing the modified magnetic powder is the same as in Example 1, and the coupling agent is changed to TC-WT titanate coupling agent. Wherein, the addition amount of the titanate coupling agent is 1.2wt% of the NdFeB magnetic powder. The organic matter is changed to ethoxylated terbium, and the content of terbium in the organic matter accounts for 0.85wt% of the NdFeB magnetic powder.

[0049] The surface-modified magnetic powder is molded at room temperature and under an orientation field with a magnetic field strength of 2T. After orientation pressing, the green body is subjected to cold isostatic pressing to increase the density of the green body. The isostatic pressure is 160 MPa. Then put the body into a vacuum sinte...

Embodiment 3 and comparative Embodiment 3

[0052] The mass fraction is 31%Nd, 68.3%Fe, 0.5% by using Nd, Al, Fe, Cu and ferroboron with a purity of at least 99% by weight in an argon atmosphere for high-frequency melting, and pouring the melt onto a chilled roll Alloy of Al, 0.2% Cu, 1% B. The process for preparing the modified magnetic powder is the same as in Example 1, and the coupling agent is a mixture of silane coupling agent and titanate coupling agent. Wherein, the addition amount of the coupling agent is 1.0wt% of the NdFeB magnetic powder, and the mixing ratio of the silane coupling agent and the titanate coupling agent is 2:1. Dysprosium content in organic matter accounts for 0.8wt% of NdFeB magnetic powder.

[0053] The surface-modified magnetic powder is molded at room temperature and under an orientation field with a magnetic field strength of 2T. After orientation pressing, the green body is subjected to cold isostatic pressing to increase the density of the green body. The isostatic pressure is 175 MPa...

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Abstract

The invention relates to an R-Fe-B series permanent magnet and a production method thereof. The R-Fe-B series permanent magnet comprises a Fe hard magnetic phase and a grain boundary phase, the chemical formula of the Fe hard magnetic phase is R12(Fe, M)14B, the grain boundary phase is rare earth-enriched compound which contains C, N and O and is coated on the surface of the Fe hard magnetic phase. According to the production method of the R-Fe-B series permanent magnet, the using amount of expensive elements Dy, Tb and Ho is reduced, the size requirement of Dy, Tb and Ho processes can be overcome, and the prepared magnet has a good magnetic property.

Description

technical field [0001] The invention relates to an R-Fe-B series permanent magnet and a production method thereof, belonging to the field of rare earth permanent magnet materials. Background technique [0002] Since the advent of sintered permanent magnet materials, it has been widely used in many fields such as electronics, energy, communications, and equipment because of its excellent magnetic properties and abundant resource reserves. In recent years, permanent magnet materials have been gradually applied in the automotive field, which requires further improvement of the magnetic properties of permanent magnets. [0003] Two important indicators of magnet performance are remanence and coercive force. The main method for improving remanence is to increase Nd 2 Fe 14 The volume fraction of B compounds and the degree of orientation of the grains are improved. For the increase of the coercive force, there have been many methods, including the refinement of grains, the use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02H01F1/057C22C38/00C22C33/02
Inventor 赵军涛于永江张玉孟李广军李咚咚孙秀彦
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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