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

A NdFeB, high-performance technology, applied in the direction of magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of inability to increase the unit weight of the surface of the magnet, limited coercive force increase, and insufficient diffusion depth, etc. , to achieve the effect of improving material utilization, eliminating the influence of surface tension, and high diffusion uniformity

Inactive Publication Date: 2019-08-23
ZHEJIANG INNUOVO MAGNETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With this method, on the one hand, the fluoride on the surface of the magnet is easy to fall off after being dried; Insufficient depth, limited coercivity improvement

Method used

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

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Effect test

Embodiment 1

[0024] A method for preparing a high-performance NdFeB magnet, comprising the following steps:

[0025] A. The weight ratio of neodymium, dysprosium, terbium, cobalt, copper, aluminum and boron: Nd-21.8%, Pr-7.4%, Dy-1.5%, Co-1.0%, Cu-0.10%, Al-0.10%, The proportion of Ga-0.10%, Zr-0.10%, B-0.96%, the balance is Fe and unavoidable impurities, the pouring is completed in a vacuum melting furnace under an inert gas environment, the pouring temperature is 1450°C, and the speed of the quenching roll is 60r / min, cooling water is passed through the quenching roller, and the thickness of the obtained scales is about 0.36mm; then, the scales are subjected to hydrogen absorption and dehydrogenation crushing in a hydrogen crushing furnace, and then passed through a jet mill to make magnetic powder with an average particle size of 3.4 μm; at room temperature Orientation pressing is carried out in an environment with a magnetic field strength of 2T orientation field to make a compact; pu...

Embodiment 2

[0043]1), neodymium, dysprosium, terbium, cobalt, copper, aluminum, boron by weight: Nd-22.9%, Pr-7.6%, Co-0.5%, Cu-0.35%, Al-0.40%, Ga-0.40% , Zr-0.15%, B-0.96%, the balance is Fe and unavoidable impurities, pouring is completed in a vacuum melting furnace under an inert gas environment, the pouring temperature is 1450 ° C, the speed of the quenching roll is 60r / min, and the quenching Cooling water is passed through the roller, and the obtained scales have a thickness of about 0.32 mm; then, the scales are crushed by hydrogen absorption and dehydrogenation in a hydrogen crushing furnace, and then passed through a jet mill to make magnetic powder with an average particle size of 3.2 μm; at room temperature and magnetic field strength of Orientation pressing was carried out in an orientation field environment of 2T to make a compact; the compact was placed in a sintering furnace under an Ar atmosphere, and sintered at 1075°C for 5h to obtain a green compact, which was aged at 50...

Embodiment 3

[0054] 1), neodymium, dysprosium, terbium, cobalt, copper, aluminum, boron by weight: Nd-22.9%, Pr-7.6%, Co-0.5%, Cu-0.35%, Al-0.40%, Ga-0.40% , Zr-0.15%, B-0.96%, the balance is Fe and unavoidable impurities, pouring is completed in a vacuum melting furnace under an inert gas environment, the pouring temperature is 1450 ° C, the speed of the quenching roll is 60r / min, and the quenching Cooling water is passed through the roller, and the obtained scales have a thickness of about 0.32 mm; then, the scales are crushed by hydrogen absorption and dehydrogenation in a hydrogen crushing furnace, and then passed through a jet mill to make magnetic powder with an average particle size of 3.2 μm; at room temperature and magnetic field strength of Orientation pressing was carried out in an orientation field environment of 2T to make a compact; the compact was placed in a sintering furnace under an Ar atmosphere, and sintered at 1075°C for 5h to obtain a green compact, which was aged at 5...

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Abstract

The invention discloses a preparation method of a high-performance neodymium-iron-boron magnet. The preparation method comprises the following steps: preparing R1-Fe-B-M sintered magnet blank, configuring volatile oil solvent suspension containing alloy powder of heavy rare earth or low melting point metal, hydride, fluoride or oxide and heating, cleaning the blank and immersing the blank into thesuspension at the angle of 5-45 degrees and then taking out and sintering so as to obtain the magnet. The preparation method has the advantages that the high-temperature volatile organic solvent is applied and volatilization is quite quick so as to greatly improve uniformity and controllability, omit the conventional dip-coating or spray-drying process in the past, save energy, greatly improve the production efficiency, increase the material utilization rate reduce the cost and have higher uniformity of diffusion; and the introduction of impurities such as C is greatly reduced by the use of the volatile solvent.

Description

technical field [0001] The invention relates to a preparation method of a high-performance NdFeB magnet. Background technique [0002] Sintered R-Fe-B magnet is the third generation of permanent magnet. Since it was invented by Japanese scholars in 1983, it has been widely used in communication, medical, automobile, electronics, aviation and other fields because of its excellent magnetic properties and high cost performance. Especially with the improvement of the country's requirements for energy conservation and environmental protection, it has been more widely used in new energy fields such as wind power generation and pure electric vehicles. With the development of science and technology, the requirements for the comprehensive performance of NdFeB magnets in various fields are getting higher and higher, and the price of rare earth raw materials has been rising continuously in recent years. The development of low-cost and high-performance NdFeB materials has become an urge...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0553H01F1/0577H01F41/0266H01F41/0293
Inventor 魏中华王黎旭许丁丁何杰杰吴小康赵栋梁
Owner ZHEJIANG INNUOVO MAGNETICS
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