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Assistant alloy for improving coercive force of NdFeB permanent magnet material and application method

A technology of auxiliary alloys and application methods, which is applied in the manufacturing of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., and can solve the problems of substandard comprehensive performance of materials and high production costs.

Inactive Publication Date: 2020-07-07
甘肃稀土新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an auxiliary alloy for improving the coercive force of NdFeB permanent magnet materials, which is added to the main alloy according to a certain proportion, and after sintering, it can improve the microstructure of the NdFeB magnet grain boundary and improve its internal strength. The effect of intrinsic coercive force and squareness solves the problems of high production cost or substandard material comprehensive performance generally existing in the improvement of NdFeB coercive force in the prior art

Method used

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  • Assistant alloy for improving coercive force of NdFeB permanent magnet material and application method
  • Assistant alloy for improving coercive force of NdFeB permanent magnet material and application method
  • Assistant alloy for improving coercive force of NdFeB permanent magnet material and application method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1, preparation and smelting NdFeB main alloy, its molecular formula is (Pr 0.17 Nd 0.53 Ce 0.25 Gd 0.05 ) 2.6 (Fe 0.98 Cu 0.002 AI 0.015 Zr 0.003 ) 14 B 1.06 .

[0039] Step 2, preparation and smelting auxiliary alloy, the molecular formula of auxiliary alloy is (Pr 0.5 Ce 0.2 Nd 0.3 ) 6 Fe 12.5 Cu 0.5 Al, smelting auxiliary alloy, requires the line speed of the copper roller to be 1.4m / s, the pouring temperature to be 1400-1430℃, and the refining time to be 5min.

[0040] In step 3, hydrogen explosion crushing and subsequent dehydrogenation treatment are performed on the main and auxiliary alloys respectively; the temperature of the dehydrogenation treatment is 560° C., and the time is 3 hours.

[0041] In step 4, antioxidants are added to the main and auxiliary alloys respectively, and mixed respectively; the amount of antioxidants added is 2‰ of the weight of hydrogen fragments.

[0042]Step 5, the main and auxiliary alloys are jet milled into p...

Embodiment 2

[0048] Except that the main and auxiliary alloy weight ratio in step 5 is changed (main alloy: auxiliary alloy=100: 3), other steps and process conditions are the same as in embodiment 1.

Embodiment 3

[0050] Except that the main and auxiliary alloy weight ratio in step 5 is changed (main alloy: auxiliary alloy=100:5), other steps and process conditions are the same as in embodiment 1.

[0051] The magnetic properties of the NdFeB permanent magnet prepared by the above method were tested using the NIM-10000H bulk rare earth permanent magnet nondestructive testing system. The test results are shown in Table 1:

[0052] Table 1 Magnetic performance data

[0053]

[0054] It can be seen from Table 1 that the NdFeB permanent magnet prepared by the method of the present invention has better magnetic properties than the NdFeB permanent magnet prepared by the traditional single alloy process, especially the intrinsic coercive force is significantly improved.

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Abstract

The invention discloses an assistant alloy for improving coercive force of an NdFeB permanent magnet material and an application method, and belongs to the field of magnetic materials. A general formula of the alloy is (Pr<1-x>R<x>)<6>Fe<13-y>M<y>Al, wherein R is one or a combination of La, Ce and Nd, and M is one or a combination of Cu and Ga; and value ranges of x and y in the general formula are respectively 0<=x<=0.5, and 0<=y<=1. The provided assistant alloy is added into a main alloy in a certain proportion, the effects of improving the microscopic structure of the grain boundary of an NdFeB magnet and increasing intrinsic coercive force and square degree of the magnet are achieved after sintering, and the problems of high production cost or substandard overall performance of the materials commonly existing in improving of the coercive force of the NdFeB in the prior art are solved.

Description

technical field [0001] The invention relates to the field of magnetic material preparation, in particular to an auxiliary alloy for improving the coercive force of NdFeB permanent magnet materials and an application method. Background technique [0002] Sintered NdFeB has the highest saturation magnetic energy product and the largest intrinsic coercive force among existing permanent magnet materials. Sintered NdFeB is prepared by powder metallurgy process, and its microstructure mainly includes the main phase (Nd 2 Fe 14 B phase), neodymium-rich phase and a small amount of boron-rich phase. Among them, the neodymium-rich phase is generally distributed along the grain boundary of the main phase, with a thickness of about 2nm. During the sintering process, it plays the role of liquid phase to assist sintering, and can also play the role of demagnetization exchange coupling, which is beneficial to the improvement of coercive force. [0003] At present, NdFeB permanent magnet...

Claims

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Application Information

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IPC IPC(8): C22C38/16C22C38/06B22F9/02B22F3/02B22F3/04B22D11/06B22F3/10B22F3/24C22C38/14C22C38/12H01F1/057H01F41/02
CPCB22D11/0611B22F3/02B22F3/04B22F3/1007B22F3/24B22F9/023B22F2003/248C22C38/002C22C38/005C22C38/06C22C38/12C22C38/14C22C38/16H01F1/0576H01F1/0577H01F41/0266
Inventor 周宏亮李俊平白立忠郭小龙张珊珊甘佩佩张文博葛鹏李建斌牛振军张忠
Owner 甘肃稀土新材料股份有限公司
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