Preparation method capable of improving processability for sintered neodymium-iron-boron for motor

A neodymium iron boron and workability technology is applied in the field of preparation of sintered neodymium iron boron for electric motors, which can solve the problems of low toughness, high hardness and angle drop, and achieve the effect of enhancing toughness, optimizing the preparation process and improving the damage.

Active Publication Date: 2015-05-13
无锡天宝电机有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high hardness and low toughness of NdFeB, it is inevitable to cause mechanical processing damage such as corner drop, edge drop, and spotting during processing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for preparing sintered NdFeB for motors with improved processability, the NdFeB is composed of the following components in weight percentage: Sb: 0.5%, Cu: 1.8%, Ti: 0.6%, Nd 35%, B: 2.8%, added elements: Co 0.5%, the balance is Fe; its preparation steps are:

[0015] 1) NdFeB alloy flakes are prepared by chilling strip technology, and NdFeB alloy powder with an average particle size of 3-6 μm is prepared by hydrogen crushing and jet milling technology;

[0016] 2) The powder is pressed and formed under a magnetic field of 4T, and its density after forming is 5.2g / cm 3 ;

[0017] 3) Put the green body into a high vacuum sintering furnace, sinter at 1130°C for 5 hours under a vacuum degree of 0.005-0.01Pa, then slowly cool to 460°C, carry out heat preservation treatment for 5 hours, and finally cool rapidly to 70°C and leave the furnace.

Embodiment 2

[0019] A method for preparing sintered NdFeB for motors with improved processability, the NdFeB is composed of the following components in weight percentage: Sb: 1.2%, Cu: 1.3%, Ti: 1.2%, Nd30%, B : 3.6%, added element: Ni0.05%, the balance is Fe; its preparation steps are:

[0020] 1) NdFeB alloy flakes are prepared by chilling strip technology, and NdFeB alloy powder with an average particle size of 3-6 μm is prepared by hydrogen crushing and jet milling technology;

[0021] 2) The powder is compacted under a magnetic field of 6T, and its density after molding is 4.9g / cm 3 ;

[0022] 3) Put the green body into a high vacuum sintering furnace, sinter at 1150°C for 3 hours under a vacuum degree of 0.005-0.01Pa, then slowly cool to 520°C, carry out heat preservation treatment for 3 hours, and finally cool rapidly to 70°C and leave the furnace.

Embodiment 3

[0024] A method for preparing sintered NdFeB for motors with improved processability, the NdFeB is composed of the following components in weight percentage: Sb: 0.8%, Cu: 1.5%, Ti: 0.9%, Nd 33%, B: 3.2%, added elements: Co and Ni 0.3%, wherein Co accounts for 65%, Ni accounts for 35%, and the balance is Fe; its preparation steps are:

[0025] 1) NdFeB alloy flakes are prepared by chilling strip technology, and NdFeB alloy powder with an average particle size of 3-6 μm is prepared by hydrogen crushing and jet milling technology;

[0026] 2) The powder is compacted under a magnetic field of 5T, and its density after molding is 5.1g / cm 3 ;

[0027] 3) Put the green body into a high-vacuum sintering furnace, sinter at 1140°C for 4 hours under a vacuum degree of 0.005-0.01Pa, then slowly cool to 490°C, carry out heat preservation treatment for 4 hours, and finally cool rapidly to 70°C and leave the furnace.

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PUM

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Abstract

The invention discloses a preparation method capable of improving the processability for sintered neodymium-iron-boron for a motor. The composite addition of three alloy elements is realized by simultaneously adding the elements of antimony, copper and titanium into neodymium-iron-boron, so that the high / low-temperature mechanical property of the material is improved, the toughness is reinforced, and the probability of structural damage caused because of thermal shock is reduced. Meanwhile, the destruction of the neodymium-iron-boron material in the processing procedure is greatly enhanced, and the rate of finished products is enhanced. The preparation process is simplified, and the sintering temperature and the aging temperature are accurately controlled, so that the microstructure of alloy is thinned. Therefore, the toughness of the alloy is reinforced, and the processability is enhanced.

Description

technical field [0001] The invention relates to the field of permanent magnet preparation for motors, in particular to a method for preparing sintered NdFeB for motors with improved processability. Background technique [0002] Sintered NdFeB permanent magnet is currently the permanent magnet material with the highest magnetic energy product, and its 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 the application field of NdFeB, people put forward higher and higher requirements for its machinability. [0003] The machinability of NdFeB is one of the difficulties in the breakthrough application field of NdFeB. For heterogeneous parts with complex structures, after molding, they need to be chamfered, rounded, hollowed out, cut and other mechanical processing. Due to the high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K15/00H01F1/057C22C38/16C22C33/02B22F3/16
Inventor 刘裕康
Owner 无锡天宝电机有限公司
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