Rare earth permanent magnetic material and preparation method thereof

A technology of rare earth permanent magnets and magnetic powders, which is applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of magnet performance deterioration, achieve excellent comprehensive magnetic properties, enhance demagnetization coupling, and increase the effect of volume fraction

Active Publication Date: 2018-04-24
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in the Chinese published patent application CN1035737A, La and Ce are partially replaced by Nd by direct smelting, and a cheap Nd-La, Ce-Fe-B magnet is obtained, but the performance of the magnet deteriorates significantly.

Method used

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  • Rare earth permanent magnetic material and preparation method thereof

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preparation example Construction

[0030] The present invention provides a kind of preparation method of rare earth permanent magnet material, and it comprises the following several steps:

[0031] S1, providing main alloy magnetic powder and auxiliary alloy powder respectively, wherein the chemical formula of the main alloy magnetic powder is [(Pr r Nd 1-r ) x MM 1-x )] a T m b B c Fe 1-a-b-c , r, x, a, b, c are the mass percentages of the corresponding elements, and 0≤r≤1, 0≤x≤1, 28≤a≤33, 0≤b≤5, 0.85≤c≤1.5, MM is at least one of the high-abundance rare earths La and Ce, Tm is one or more of Fe, Ga, Co, Cu, Nb, Al, Zr elements, and the chemical formula of the auxiliary alloy powder is Ce y (Fe d m 1-d ) 1-y , y, d are the mass percentages of the corresponding elements, and 0.5≤y≤1, 0≤d≤1, where M is one or more of Cu, Al, Ga, Co, Ni;

[0032] S2, uniformly mixing the main alloy magnetic powder and the auxiliary alloy powder to obtain a mixed magnetic powder, wherein the mass percentage of the auxili...

Embodiment (1

[0056] According to [(Pr 0.2 Nd 0.8 ) 0.72 Ce 0.28 ] 30.5 al 0.2 Cu 0.1 Ga 0.1 Fe 68.1 B 1 Proportioning Proportioning of main alloy raw materials. The proportioned main alloy is put into the quick-setting furnace for melting after grinding, and the melting temperature is controlled at 1350°C, and the speed of the copper roller is kept at 1.2m / s during the melting. The main alloy quick-setting sheet with an average thickness of 0.3 mm to 0.5 mm is obtained through the quick-setting process. The obtained main alloy quick-setting sheet is placed in a hydrogen breaking furnace, hydrogen-charged and crushed to obtain the main alloy coarsely crushed powder, and then the obtained main alloy coarsely crushed powder is continued to be crushed in a jet mill protected by nitrogen to obtain an average particle size of 2μm ~ 3μm main alloy jet mill powder.

[0057] According to Ce 92 Fe 8 Proportioning of auxiliary alloy raw materials. The proportioned auxiliary alloy is pol...

Embodiment (2

[0063] Embodiment (2) The process of preparing rare earth permanent magnet material is basically the same as that of embodiment (1), except that the main alloy jet mill powder with a mass fraction of 97% is mixed with an auxiliary alloy powder with a mass fraction of 3%. And the sintering temperature in the sintering process is 1000°C.

[0064] The magnetic properties of the prepared rare earth permanent magnet material were tested at room temperature, and the test results are shown in Table 1.

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Abstract

The invention relates to a preparation method of a rare earth permanent magnetic material. The method comprises the following steps that 1, main alloy magnetic powder and auxiliary alloy powder are provided separately, wherein the chemical formula of the main alloy magnetic powder is [(PrrNd1-r)xMM1-x)]aTmbBcFe1-a-b-c, MM is at least one of high-abundance rare earth La and Ce, Tm is one or more ofFe, Ga, Co, Cu, Nb, Al and Zr, the chemical formula of the auxiliary alloy powder is Cey(FedM1-d)1-y, y and d are the mass percentages of corresponding elements, and M is one or more of Cu, Al, Ga, Co and Ni; 2, the main alloy magnetic powder and the auxiliary alloy powder are uniformly mixed to obtain mixed magnetic powder, wherein the mass percentage of the auxiliary alloy powder in the mixed magnetic powder is 1-5%; 3, the mixed magnetic powder is sequentially subjected to orientation forming, sintering and tempering, and the rare earth permanent magnetic material is obtained. The invention further provides the rare earth permanent magnetic material obtained by means of the preparation method.

Description

technical field [0001] The invention relates to a rare earth permanent magnet material and a preparation method thereof. Background technique [0002] Rare earth permanent magnet materials are permanent magnet materials based on intermetallic compounds formed by rare earth metal elements and transition metals. NdFeB permanent magnet materials (also known as NdFeB permanent magnet materials) have excellent magnetic properties and have been widely used in social production, life, national defense and aerospace and other fields, and have become important functional materials supporting social progress. In NdFeB permanent magnet materials, the cost of rare earth Nd accounts for more than 90% of the cost of raw materials. With the development of industry and the progress of society, the use of Nd-Fe-B permanent magnet materials is increasing year by year, and the production cost is also getting higher and higher. Moreover, the rare earth elements often added in Nd-Fe-B permanen...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08C22C38/32
CPCC22C38/005C22C38/32H01F1/0575
Inventor 陈侃郭帅范晓东丁广飞陈仁杰闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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