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Preparation method for sintered Nd-Fe-B permanent-magnet material

A permanent magnet material, NdFeB technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of poor corrosion resistance, low coercivity, poor mechanical properties, etc., to increase the coercivity, reduce Potential difference, effect of increasing intensity

Active Publication Date: 2014-02-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a preparation method of a novel sintered NdFeB permanent magnet material, aiming at improving the problems of low coercive force, poor corrosion resistance and poor mechanical properties of existing sintered NdFeB permanent magnets

Method used

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Effect test

Embodiment 1

[0018] The design is based on the 2:14:1 NdFeB-based alloy composition Nd27Fe72B1 (weight percentage), according to the designed composition, and considering the burning loss of rare earth Nd 4% (weight percentage), the thickness of the flake ingot is about 320 μm NdFeB-based quick-setting flakes, using hydrogen breaker plus jet mill to prepare 2:14:1 NdFeB-based powder with an average particle size of 3.8 μm, adding 5% NdFeB-based powder with an average particle size of 50nm Cu60Zn40 (weight percent) powder, mix the two powders uniformly in the mixer, and the uniformly mixed powder is oriented and pressed in a 2.0T magnetic field and isostatically pressed, and the obtained compact is placed in a vacuum sintering furnace , sintered at 1040°C for 2 hours, and finally carried out secondary heat treatment, that is, heat treatment at 720°C (primary heat treatment temperature) and 360°C (secondary heat treatment temperature) for 2 hours respectively. The new sintered NdFeB magnet ha...

Embodiment 2

[0020] The design is based on the 2:14:1 NdFeB-based alloy composition Nd27Fe72B1 (weight percentage), according to the designed composition, and considering the burning loss of rare earth Nd 4% (weight percentage), the thickness of the flake ingot is about 350 μm NdFeB-based quick-setting flakes, using hydrogen breaker plus jet mill to prepare 2:14:1 NdFeB-based powder with an average particle size of 3.4 μm, adding 6% by weight fraction and an average particle size of 60nm Cu80Zn20 (weight percent) powder, mix the two powders uniformly in a mixer, and the uniformly mixed powder is oriented and pressed in a 2.0T magnetic field and isostatically pressed, and the obtained compact is placed in a vacuum sintering furnace , sintered at 1060°C for 2 hours, and finally carried out secondary heat treatment, that is, heat treatment at 780°C (primary heat treatment temperature) and 400°C (secondary heat treatment temperature) for 2 hours respectively, to obtain sintered NdFeB magnetic m...

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Abstract

The invention belongs to the field of rare earth permanent magnetic material, and particularly discloses a preparation method for a novel sintered Nd-Fe-B permanent-magnet material. During the sintered Nd-Fe-B preparation process, a small amount of Cu-Zn alloy nanometer powder is uniformly mixed with Nd-Fe-B powder on the basis that the phase ratio of Nd to Fe to B is 2:14:1, and the mixture is subjected to magnetic field oriented compression molding, vacuum sintering and tempering thermal treatment, so that a finished product can be obtained. In the organizational structure of the novel sintered Nd-Fe-B product, the Cu-Zn phase completely replaces the Nd-rich phase of the grain boundary in the traditional product, and has the magnetic isolation and sintering assistance functions of the Nd-rich phase, so that integrated performance such as high coercivity, high corrosion resistance and high roughness can be acquired at the same time; the method is simple to operate, easy to realize industrial production and low in production cost.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, and in particular relates to a preparation technology of novel sintered NdFeB. Background technique [0002] Since the sintered NdFeB rare earth permanent magnet was first invented by Sumitomo Metal Corporation in Japan in 1983, because it has higher remanence and magnetic energy product than other permanent magnets, good dynamic recovery characteristics and high performance-price ratio, it has been widely used in high-tech It has been widely used in industrial fields. The development of NdFeB magnets with better performance has always been the core of research and development in various countries, because the higher the performance of NdFeB magnets, the lighter the weight of the magnets required to manufacture devices with the same function. Therefore, high-performance NdFeB magnets are ideal materials for manufacturing industrial magnetic functional devices with high effici...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08B22F1/00
Inventor 高学绪汤明辉包小倩崔俊娟卢克超
Owner UNIV OF SCI & TECH BEIJING
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