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Preparation method of high-performance neodymium-iron-boron magnet

A NdFeB high-performance technology, applied in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of reducing the saturation magnetization of the main phase grains and reducing the remanence of the magnets

Active Publication Date: 2016-12-07
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, when the grain boundary diffuses, due to the influence of the microstructure of the main phase grains and the grain boundary phase, part of dysprosium and terbium do not continue to diffuse along the grain boundary to the inside of the magnet, but instead enter the main phase grains, and the main phase The replacement of Nd in the grains reduces the saturation magnetization of the main phase grains, resulting in a decrease in the remanence of the magnet, and the (Dy / Tb) formed by the substitution reaction at the grain boundaries 2 Fe 14 The relative reduction of B inhibits the improvement of the coercive force of the magnet

Method used

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  • Preparation method of high-performance neodymium-iron-boron magnet

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Experimental program
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Effect test

Embodiment 1

[0018] Table 1 NdFeB alloy and assisted diffusion alloy flakes

[0019]

[0020] According to the components shown in Table 1, smelt NdFeB alloy flakes and auxiliary diffusion alloy flakes. The two alloys were ground into powder by HD, intermediate grinding, and jet milling respectively. The particle size of the NdFeB alloy powder was 5 μm, and that of the assisted diffusion alloy powder was 9 μm. The NdFeB alloy powder is pressed separately, sintered at 1050°C for 5 hours to form a magnet, and the magnet M1 is prepared; the auxiliary diffusion alloy powder is mixed with the NdFeB alloy powder at a ratio of 1.5wt%, pressed and formed, and sintered at 1050°C for 5 hours to form a billet. Magnet M2. Both magnets are processed into 15-15-4 flakes, and the surface is coated with mixed slurry (dysprosium metal powder is mixed with ethanol at a ratio of 4%). The weight gain ratio of the magnets before and after coating is 1.0%, and the diffusion treatment is 8h at 920°C. Then a...

Embodiment 2

[0025] Table 3 NdFeB alloy and assisted diffusion alloy flakes

[0026]

[0027] According to the components shown in Table 3, smelt NdFeB alloy flakes and auxiliary diffusion alloy flakes. The two alloys were ground into powder by HD, intermediate grinding, and jet milling respectively. The particle size of the NdFeB alloy powder was 6 μm, and the particle size of the assisted diffusion alloy powder was 8 μm. The NdFeB alloy powder is pressed separately, sintered at 1080°C for 4 hours to form a magnet, and the magnet M3 is prepared; the auxiliary diffusion alloy powder is mixed with the NdFeB alloy powder at a ratio of 1.2wt%, pressed and formed, and sintered at 1080°C for 4h to form a billet. Magnet M4. Both magnets are processed into 15-15-4 thin slices, and the surface is coated with mixed slurry (dysprosium fluoride powder is mixed with ethanol at a ratio of 4.5%). The weight gain ratio of the magnets before and after coating is 0.8%, and the diffusion treatment is at...

Embodiment 3

[0032] Table 5 NdFeB alloy and assisted diffusion alloy flakes

[0033]

[0034] According to the components shown in Table 5, smelt NdFeB alloy flakes and auxiliary diffusion alloy flakes. The two alloys were ground into powder by HD, intermediate grinding, and jet milling respectively. The particle size of the NdFeB alloy powder was 6 μm, and the particle size of the assisted diffusion alloy powder was 10 μm. The NdFeB alloy powder is pressed separately, sintered at 1060°C for 5h to form a magnet, and the magnet M5 is prepared; the auxiliary diffusion alloy powder is mixed with the NdFeB alloy powder at a ratio of 2.2wt%, pressed and formed, and sintered at 1060°C for 5h to form a billet. Magnet M6. Both magnets are processed into 15-15-4 flakes, and the surface is coated with mixed slurry (metal terbium powder is mixed with ethanol at a ratio of 3.5%). The weight gain ratio of the magnets before and after coating is 0.8%, and the diffusion treatment is at 920°C for 8 ho...

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Abstract

The invention discloses a preparation method of a high-performance neodymium-iron-boron magnet. The preparation method mainly comprises a step of manufacturing an auxiliary diffusion alloy, wherein auxiliary diffusion alloy powder and normal neodymium-iron-boron magnet powder are mixed and sintered, and then are subjected to dysprosium and terbium element diffusion on the crystal boundary to obtain the auxiliary diffusion alloy; and the auxiliary diffusion alloy comprises the main components of Nd-Fe-M, wherein Nd is an Nd element, Fe is an Fe element and M is one or a combination of multiple elements of Al, Cu, Ga, Mg, Ca, Zr, Ti, Co and Nb, wherein Nd is 60-80wt%, Fe is 5-15wt%, and the M is 5-35wt%. Compared with the prior art, by adoption of the technical scheme of the preparation method, dysprosium and terbium are enriched at the crystal boundary, and a crystal boundary diffusion channel is provided; diffusion of the dysprosium and terbium to the interior of main phase crystal particles is suppressed; the effective diffusion utilization rate of the dysprosium and terbium is improved; and the magnet coercivity is improved.

Description

technical field [0001] The invention relates to the field of magnets, in particular to a method for preparing a high-performance sintered NdFeB magnet. technical background [0002] Due to its excellent performance, sintered NdFeB magnets have been widely used in many fields such as automobiles, electronics, and energy. With the expansion of the application range, the demand for high-performance NdFeB magnets is increasing, and it is also becoming more and more urgent. The addition of heavy rare earth elements such as dysprosium and terbium can significantly improve the coercive force of sintered NdFeB magnets, so heavy rare earth elements such as dysprosium and terbium are indispensable and important component elements in the production of high-performance NdFeB magnets. However, heavy rare earth elements such as dysprosium and terbium are rare and non-renewable resources. While adhering to sustainable development and scientific and technological progress, how to effective...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
Inventor 赵军涛刘磊尼洪香王聪
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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