Preparation method of sintered neodymium-iron-boron with high corrosion resistance and machinability

A high corrosion resistance, NdFeB technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of low ductility, drop corners, edge drop, spotting knife wire, high hardness of NdFeB, etc. Achieve the effects of enhanced ductility, improved corrosion resistance and machinability, and improved processing yield

Inactive Publication Date: 2014-04-30
安徽万磁电子股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high hardness and low ductility of NdFeB, it will inevitably cause machining damage such as corner drop, edge drop, spot, and knife wire during machining.

Method used

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  • Preparation method of sintered neodymium-iron-boron with high corrosion resistance and machinability
  • Preparation method of sintered neodymium-iron-boron with high corrosion resistance and machinability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) The NdFeB steel ingot is prepared by the ingot casting process, and its nominal composition atomic percentage is:

[0016] Pr is 2.27%, Nd is 11.03%, B is 6.02%, Dy is 0.59%, Co is 1.12%, V is 0.26%, Zn is 1.6%, Al is 1.22%, Cu is 0.16%, Fe is 75.73%,

[0017] (2) Use the hydrogen crushing-jet milling process to make powder, and the average particle size of NdFeB particles after powder making is 3.5um;

[0018] (3) Compressed in a 1.7T magnetic field;

[0019] (4) Perform isostatic pressing on the formed green body under a pressure of 130-200Mpa for 5-20 seconds;

[0020] (5) Carry out the corrosion resistance weight loss test of the magnetic performance test box and the slice yield statistics in actual production. The conditions of the weight loss test are pressure 2 atmospheres, temperature 120°C, humidity 100% RH, and time 72 hours.

[0021] The performance of the samples prepared by the above process is compared with ordinary NdFeB as follows:

[0022]

Embodiment 2

[0024] (1) The NdFeB steel ingot is prepared by ingot casting, and its nominal composition atomic percentage is:

[0025] Pr is 3.25%, Nd is 10.15%, B is 5.9%, Dy is 0.39%, Co is 1.42%, V is 0.28%, Zn is 2.2%, Al is 0.53%, Cu is 0.22%, Fe is 75.66%, ;

[0026] (2) Use the hydrogen crushing-jet milling process to make powder, and the average particle size of NdFeB particles after powder making is 3.3um;

[0027] (3) Compressed in a 1.7T magnetic field;

[0028] (4) Carry out 130-200M of the formed green body p Carry out isostatic pressing under the pressure of a for 5-20 seconds;

[0029] (5) Carry out the corrosion resistance weight loss test of the magnetic performance test box and the slice yield statistics in actual production. The conditions of the weight loss test are pressure 2 atmospheres, temperature 120°C, humidity 100% RH, and time 72 hours.

[0030] The performance of the samples prepared by the above process is compared with ordinary NdFeB as follows:

[0031]...

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PUM

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Abstract

The invention discloses a preparation method of sintered neodymium-iron-boron with high corrosion resistance and machinability. According to the preparation method, a method of compositely adding vanadium and zinc is used, the processability of the sintered neodymium-iron-boron material is greatly improved while the corrosion resistance of the neodymium-iron-boron material is improved on the premise that the magnesium of the material is surely not changed, and the demands of high-end customers are met.

Description

technical field [0001] The invention mainly relates to the field of NdFeB magnetic material processing, in particular to a preparation method of sintered NdFeB with high corrosion resistance and machinability. Background technique [0002] Sintered NdFeB material is currently the permanent magnet material with the highest magnetic energy product, especially sintered NdFeB permanent magnet, whose ultra-high coercive force and remanence have earned it the title of "Magnetic King". High coercive force and high remanence provide greater magnetic flux density in applications, greatly reducing the size of the device. However, with the expansion of NdFeB application fields, customers have put forward higher requirements for the corrosion resistance and processability of sintered NdFeB. [0003] Sintered NdFeB is a compound alloy that is easily corroded and damaged in a humid and high temperature environment. Under the current conditions, most NdFeB sintered permanent magnets in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/02C22C38/12C22C38/16H01F1/057
Inventor 张亚波路河树史世文
Owner 安徽万磁电子股份有限公司
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