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Preparation method for high-thermal-stability NdFeB magnet

A high thermal stability, neodymium iron boron technology, applied in the direction of magnetic objects, inductors/transformers/magnet manufacturing, magnetic materials, etc., can solve the problems of low utilization rate, hindered improvement of coercive force, expensive diffusing agent, etc., to achieve Increase the Curie temperature, increase the coercive force, and improve the effect of the temperature coefficient of magnetic induction

Active Publication Date: 2017-11-28
廊坊京磁精密材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method improves the coercive force and remanence temperature stability of sintered NdFeB magnets to a certain extent, the Dy and its compound diffusion agents are expensive, and the utilization rate in the diffusion process is low, and the increase in coercive force will As the depth of the sample increases, it is hindered, and the patent does not make an experimental description of the irreversible loss of magnetic flux

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  • Preparation method for high-thermal-stability NdFeB magnet
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  • Preparation method for high-thermal-stability NdFeB magnet

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Embodiment 1

[0026] The preparation method of high thermal stability NdFeB magnet of the present invention, it comprises the following steps:

[0027] (1) The X alloy raw material and the Y alloy raw material are respectively smelted by using a vacuum induction quick solidification casting furnace. X alloy composition is Nd 3.5 Dy 30 Fe 65 Nb 0.4 B 1.1 , Y alloy composition is Nd 33.5 Fe 35 co 30 Nb 0.4 B 1.1 , are made into alloy flakes with a thickness of 0.15-0.45mm;

[0028] (2) The X alloy and Y alloy flakes are subjected to hydrogen explosion treatment respectively, the hydrogen absorption pressure is 0.098Mpa, and the dehydrogenation is carried out after the hydrogen absorption is saturated. The dehydrogenation temperature is 580°C, and the dehydrogenation time is 6h to make 300-500μm neodymium Iron-boron alloy particles.

[0029] (3) The X and Y alloy particles obtained above are further passed through jet mill equipment to make powders with an average particle size of 2...

Embodiment 2

[0041] The preparation method of high thermal stability NdFeB magnet of the present invention, it comprises the following steps:

[0042] (1) The X alloy raw material and the Y alloy raw material are respectively smelted by using a vacuum induction quick solidification casting furnace. X alloy composition is Nd 3.5 Dy 30 Fe 65 Nb 0.4 B 1.1 , Y alloy composition is Nd 33.5 Fe 35 co 30 Nb 0.4 B 1.1 , are made into alloy flakes with a thickness of 0.15-0.45mm;

[0043] (2) The X alloy and Y alloy flakes are subjected to hydrogen explosion treatment respectively, the hydrogen absorption pressure is 0.098Mpa, and the dehydrogenation is carried out after the hydrogen absorption is saturated. The dehydrogenation temperature is 560°C, and the dehydrogenation time is 5.8h to make 300-500μm NdFeB alloy particles.

[0044] (3) The X and Y alloy particles obtained above are further passed through jet milling equipment to make powders with an average particle size of 2 to 4 μm; ...

Embodiment 3

[0056] The preparation method of high thermal stability NdFeB magnet of the present invention, it comprises the following steps:

[0057] (1) The X alloy raw material and the Y alloy raw material are respectively smelted by using a vacuum induction quick solidification casting furnace. X alloy composition is Nd 3.5 Dy 30 Fe 65 Nb 0.4 B 1.1 , Y alloy composition is Nd 33.5 Fe 35 co 30 Nb 0.4 B 1.1 , are made into alloy flakes with a thickness of 0.15-0.45mm;

[0058] (2) The X alloy and Y alloy flakes are subjected to hydrogen explosion treatment respectively, the hydrogen absorption pressure is 0.098Mpa, and the dehydrogenation is carried out after the hydrogen absorption is saturated. The dehydrogenation temperature is 530°C, and the dehydrogenation time is 5.5h to make 300-500μm NdFeB alloy particles.

[0059] (3) The X and Y alloy particles obtained above are further passed through jet milling equipment to make powders with an average particle size of 2 to 4 μm; ...

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Abstract

The invention relates to a preparation method for a high-thermal-stability NdFeB magnet. The preparation method comprises the steps of taking X alloy Nd3.5Dy30Fe65Nb0.4B1.1 and Y alloy Nd33.5Fe35Co30Nb0.4B1.1 as raw materials; uniformly mixing X alloy powder and Y alloy powder according to a mass ratio of 1 : 3 to 1 : 28 to prepare mixed powder; and performing pressing forming on the mixed powder in a magnetic field to prepare an NdFeB green body. By controlling a ratio of the two initial alloys, the composition and performance of the magnet are controlled; the NdFeB green body is subjected to vacuum sintering and aging treatment to obtain the high-performance and high-thermal-stability NdFeB magnet with the practical value; and the preparation process comprises the following steps of smelting or melt-spinning, hydrogen explosion, powder preparation, pressing, vacuum sintering and aging treatment.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular to a preparation method of a high thermal stability NdFeB magnet. Background technique [0002] Since the advent of Nd-Fe-B rare earth permanent magnet materials, due to its high cost performance, small size, light weight, good mechanical properties, strong magnetism, and high energy density, NdFeB permanent magnet materials have been widely used in modern industry and electronic technology. has been widely applied. The maximum magnetic energy product of laboratory products has exceeded 444KJ / m 3 , is by far the strongest permanent magnet. In the state of bare magnets, its magnetic force can reach about 3500 Gauss. Therefore, the preparation and expansion of NdFeB magnets have always been the focus of continuous attention in the industry. [0003] In recent years, the application of NdFeB magnets has continued to expand, especially in motors. In the...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0573H01F1/0576H01F1/0577H01F41/0266
Inventor 冯招娣
Owner 廊坊京磁精密材料有限公司
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