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Ultra-high coercive force sintered Nd-Fe-B magnetic material and preparing process thereof

A magnetic material, NdFeB technology, applied in the direction of magnetic material, magnetic object, inorganic material magnetism, etc., can solve the problems of low intrinsic coercive force Hcj, low maximum working temperature of magnet, high absolute value of temperature coefficient, and improve the Intrinsic coercivity, reducing the absolute value of temperature coefficient, and prolonging equipment life

Active Publication Date: 2009-02-11
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly aims at unreasonable element replacement and improper process matching in the prior art, resulting in low intrinsic coercive force Hcj and high absolute value of temperature coefficient, so that the maximum working temperature of the magnet is low, which cannot meet the needs of modern information technology The disadvantages; provide a method for manufacturing ultra-high coercive force sintered NdFeB magnets, the produced product is a NdFeB magnetic material with ultra-high coercive force and can work up to 220 ° C, which can make up for the traditional Use temperature range of sintered NdFeB magnets and sintered SmCo magnets

Method used

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  • Ultra-high coercive force sintered Nd-Fe-B magnetic material and preparing process thereof
  • Ultra-high coercive force sintered Nd-Fe-B magnetic material and preparing process thereof
  • Ultra-high coercive force sintered Nd-Fe-B magnetic material and preparing process thereof

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Experimental program
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Effect test

Embodiment 1

[0033] By design composition Nd 25 Dy 4 Tb 4 Fe 59.45 co 6 Nb 0.4 Cu 0.1 Ga 0.05 B 1 (mass fraction, %) Prepare raw materials, smelt into ingots in a medium-frequency vacuum induction melting furnace, break alloy ingots, and grind them into powder by jet milling. The pressure of ~10MPa is compacted and formed, and then isostatic pressed at a pressure of 50~200MPa. The time of isostatic pressing is 5~20 minutes. After isostatic pressing, it is sintered in a vacuum air quenching furnace. 3 hours, the first stage heat treatment temperature is 900°C for 2.5 hours, the second stage heat treatment temperature is 500°C for 2 hours. After cooling with argon gas, it is machined into 10×7 samples were tested for magnetic properties (Table 1). Among them, Tw is the highest working temperature of the magnet, Br is 11.2kGs, Hcj is 36kOe, βHcj is -0.40%, (BH)m is 32MGOe.

Embodiment 2

[0040] By design composition Nd 23 Dy 9 Tb 0.5 Fe 61.1 co 3 Nb 2 Cu 0.1 Ga 0.5 B 0.8 (mass fraction, %) Prepare raw materials, melt them into ingots in a medium-frequency vacuum induction melting furnace, break alloy ingots, and grind them into powder by airflow. The average particle size of the magnetic powder is 4um, and it is oriented in a magnetic field greater than 17KOe. The pressure of 10MPa is compacted, and then isostatic pressing is carried out at a pressure of 50-200MPa. The time of isostatic pressing is 5-20 minutes. After isostatic pressing, it is sintered in a vacuum air quenching furnace. 3 hours, the temperature of the first heat treatment is 900°C, and the time is 3 hours, and the temperature of the second heat treatment is 500°C, and the time is 2 hours. After cooling with argon gas, it is machined into 10×7 samples were tested for magnetic properties (Table 2). Where Tw is the maximum working temperature of the magnet.

Embodiment 3

[0047] By design composition Nd 23 Dy 7 Tb 2 Fe 60.32 co 5 Nb 1 Cu 0.5 Ga 0.1 B 1.08 (mass fraction, %) Prepare raw materials, melt them into ingots in a medium-frequency vacuum induction melting furnace, break alloy ingots, and grind them into powder by airflow. The average particle size of the magnetic powder is 4um, and it is oriented in a magnetic field greater than 17KOe. The pressure of 10MPa is compacted, and then isostatic pressing is carried out at a pressure of 50-200MPa. The time of isostatic pressing is 5-20 minutes. After isostatic pressing, it is sintered in a vacuum air quenching furnace. 3 hours, the temperature of the first heat treatment is 900°C, and the time is 3 hours, and the temperature of the second heat treatment is 500°C, and the time is 2 hours. After cooling with argon gas, it is machined into 10×7 samples were tested for magnetic properties (Table 3). Where Tw is the maximum working temperature of the magnet.

[0048] Table 3: Magnetic ...

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Abstract

This invention relates to super-high coercive force sintering neodymium iron boron magnet and its preparation method. the alloy molecular general formula is NdxDyyTbzFe(100%-x-y-z-x1-y1-z1-w-w1)Cox1Nby1Cuz1(Ga)wBw1, intrinsic coercive force more than 35k0e(2786kA / m) sintering neodymium iron boron magnet are made through traditional normal ingot casting method. The highest work temperature is 220 degrees centigrade, so the using temperature frees position in traditional sintering neodymium iron boron magnet and sintering samarium cobalt magnet.

Description

technical field [0001] The invention relates to a magnetic material and a preparation method thereof, in particular to an ultra-high coercivity sintered NdFeB magnetic material and a preparation method thereof. Background technique [0002] In the process of the transfer of the world's manufacturing and new material industry centers to China, the new material industry as the basis of high-tech industries has attracted much attention. As an important part of the new material industry, rare earth permanent magnet materials, especially NdFeB industry, have also entered It has entered a critical period of development; my country has initially formed its own industrial system in the production of NdFeB. Production has accounted for 40% of the world's total. But in this share, high-end products have not yet formed a strong strength and lack international competitiveness. As an important part of new materials, rare earth permanent magnet materials are widely used in energy, transp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08
Inventor 何时金谭春林包大新杜君峰
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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