High-performance and high-coercivity Tb-containing magnet and preparation method thereof

A high-coercivity, high-performance technology, applied in the fields of magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of increased production cost, complex process, difficult promotion and application, etc. Simple process and continuous grain boundary distribution

Inactive Publication Date: 2018-11-02
NINGBO KETIAN MAGNET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem of these grain boundary diffusion processes is that the process is complex and the production cost increases, especially to change the existing NdFeB production process, so it is difficult to popularize and apply

Method used

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  • High-performance and high-coercivity Tb-containing magnet and preparation method thereof
  • High-performance and high-coercivity Tb-containing magnet and preparation method thereof
  • High-performance and high-coercivity Tb-containing magnet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] A kind of preparation method of Tb-containing high-performance high-coercivity magnet of the present invention comprises the following steps:

[0066] Step S1: configure the main phase alloy and Tb alloy according to the composition, and melt and quick-solidify to the main phase alloy cast sheet and the Tb alloy cast sheet;

[0067] Step S2: crushing and grinding the main phase alloy cast flakes and the Tb alloy cast flakes to obtain magnetic powder;

[0068] Step S3: Pressing and molding the magnetic powder to obtain a green body;

[0069] Step S4: performing low-temperature sintering and multi-stage tempering on the green body to obtain a magnet.

[0070] The above steps are the basic steps to obtain Tb-containing high-performance high-coercivity magnets.

[0071] The main phase alloy is RE-Fe-B alloy, Tb alloy is Tb-K alloy, where RE is one or a combination of Nd, Pr, Dy, and M is Co, Cu, Al, Ga, Nb One or a combination of several, K is one or a combination of Fe,...

Embodiment 2

[0107] In this example, the preparation method is as figure 1 As shown, wherein, in step S2, the first process scheme in Example 1 is adopted.

[0108] In step S1, the composition of the main phase alloy cast sheet obtained through smelting and rapid solidification is (PrNd) 30.3 Nb 0.4 Cu 0.2 Al 0.2 Fe 67.88 B 1.02 , the composition of Tb alloy cast sheet is Tb 85 Cu 15 , wherein the mass percentage of Tb in the Tb alloy is 85%.

[0109] In step S2, Tb alloy cast flakes with a mass percentage of 2.8% are added to the main phase alloy cast flakes, and crushed by hydrogen crushing method to obtain coarse powder with an average particle size of 220 μm; after grinding the coarse powder, the average Magnetic powder with a particle size of 2.92μm. In the milling process, the amount of oxygen added is 30ppm. Particle size detection is measured using a laser particle size analyzer.

[0110] In step S3, the magnetic powder is processed by vertical pressing and isostatic pre...

Embodiment 3

[0118] In this example, the preparation method is as image 3 As shown, wherein, in step S2, the second process scheme in embodiment 1 is adopted.

[0119] In step S1, the composition of the main phase alloy cast sheet obtained through smelting and rapid solidification is (PrNd) 28.01 Dy 1.89 Zr 0.17 Co1Cu 0.12 Al 0.1 Ga 0.25 Fe 67.56 B 0.91 , the Tb alloy casting composition is (PrNd) 15 Tb 72 Cu 3 Fe 10 , wherein the mass percentage of Tb in the Tb alloy is 72%.

[0120] The main phase alloy cast piece and the Tb alloy cast piece were broken respectively by the hydrogen crushing method to obtain a coarse powder with an average particle size of 180 μm; the Tb alloy coarse powder with a mass percentage of 4% was added to the main phase alloy coarse powder; for the mixed alloy After the coarse powder was ground, a magnetic powder with an average particle size of 2.79 μm was obtained. In the milling process, the amount of oxygen added is 35ppm. Particle size detect...

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Abstract

The invention relates to a high-performance and high-coercivity Tb-containing magnet and a preparation method thereof. The magnet is a RE-Fe-B magnet, wherein a principal phase crystal grain of the RE-Fe-B magnet is a core-shell structure, the core is a (RE, Tb)2Fe14B phase or RE2Fe14B phase, and the shell is a (RE, Tb)2Fe14B phase. The preparation method comprises the following steps of S1, configuring principal phase alloy and Tb alloy according to constituents, and melting and rapidly condensing the principal phase alloy and the Tb alloy to principal phase alloy casting sheet and Tb alloy casting sheet; S2, smashing and grinding the principal phase alloy casting sheet and the Tb alloy casting sheet to obtain magnetic powder; S3, pressing and forming the magnetic powder to obtain a greenblank; and S4, performing low-temperature sintering and multi-stage annealing on the green blank to obtain the magnet. The magnet has the advantages that the magnet is the RE-Fe-B magnet having the core-shell structure, the core is the RE2Fe14B phase which does not contain heavy rare-earth Tb or contain a few heavy rare-earth Tb, the shell is the (RE, Tb)2Fe14B phase containing a large amount ofheavy rare-earth Tb, Tb in the principal phase crystal grain of the magnet is distributed on a crystal boundary, the defect on surfaces of the crystal grains are restored, and the crystal boundary distribution is continuous.

Description

technical field [0001] The invention relates to the technical field of preparation of rare earth magnetic materials, in particular to a Tb-containing high-performance high-coercivity magnet and a preparation method thereof. Background technique [0002] Sintered Nd-Fe-B has the advantages of abundant raw materials and high magnetic properties, and is widely used in many fields such as communication, electronics, medical and automobile industries. As the permanent magnet material with the best comprehensive performance, Nd-Fe-B alloy will still not be able to be replaced for a long time to come. With the continuous expansion of new application fields represented by power motors, the requirements for their magnetic properties are also getting higher and higher. Improving the magnetic properties of magnets, especially the coercive force, has become an important direction in the research of Nd-Fe-B materials. . [0003] At present, the common measure to improve the magnetic pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0253H01F41/0266
Inventor 严长江钱尼健俞潮杰傅万成
Owner NINGBO KETIAN MAGNET
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