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Method for preparing flexible rare earth bonded neodymium-iron-boron magnet

A technology of neodymium iron boron and rare earth, which is applied in the direction of magnets, magnetic objects, magnetic materials, etc., and can solve the problems that the binder is easy to age, and it is difficult to prepare magnets with required magnetic properties and shapes.

Active Publication Date: 2017-05-10
慈溪市磁性材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of granulation, the binder is easy to age, and it is not easy to prepare magnets with high magnetic performance requirements and complex shapes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The invention provides a method for preparing a flexible rare-earth bonded NdFeB magnet, which comprises the following steps: step a) adding sodium silicate, sodium carboxymethylcellulose, potassium carbonate, citric acid fatty acid glyceride, ethylenediamine polyoxygen Ethylene polyoxypropylene block polyether, sodium sulfate, disodium edetate, sodium percarbonate, sodium laureth sulfate and trimethylsilyl magnesium chloride were dissolved in deionized water to form the first mixed solution; step b) placing the NdFeB alloy powder in the first mixed solution for the first ultrasonic oscillation, and then placing it in water at 50-80°C for the second ultrasonic oscillation, cleaning and drying; step c ) laying the NdFeB alloy powder treated in step b in a graphite furnace for ultrasonic treatment, filling hydrogen in the graphite furnace, sealing, the heating temperature of the graphite furnace is 280-320 °C, and the ultrasonic amplitude is 30- 40%; step d) evacuate the ...

Embodiment 1

[0036] (1) 100 mass parts of neodymium-iron-boron alloy powders are placed in every liter containing 50 mass parts of sodium silicate, 30 mass parts of sodium carboxymethyl cellulose, 50 mass parts of potassium carbonate, 15 mass parts of citric acid fatty acid glycerides, 5 mass parts Parts by mass of ethylenediamine polyoxyethylene polyoxypropylene block polyether, 5 parts by mass of sodium sulfate, 10 parts by mass of disodium edetate, 5 parts by mass of sodium percarbonate, 20 parts by mass of polyoxyethylene lauryl alcohol Sodium ether sulfate and 1 mass part of trimethylsilyl magnesium chloride are dissolved in a mixed solution formed by deionized water. The temperature of the mixed solution is kept at 60° C., and treated with ultrasonic vibration for 90 minutes to remove the surface oxide film. Then move the NdFeB alloy powder into hot water at 50°C and treat it with ultrasonic vibration for 60 minutes. After taking it out, rinse it with water and dry it naturally.

[0...

Embodiment 2

[0042] (1) 200 mass parts of neodymium-iron-boron alloy powders are placed in every liter containing 20 mass parts of sodium silicate, 40 mass parts of sodium carboxymethyl cellulose, 20 mass parts of potassium carbonate, 20 mass parts of citric acid fatty acid glycerides, 1 Parts by mass of ethylenediamine polyoxyethylene polyoxypropylene block polyether, 20 parts by mass of sodium sulfate, 2 parts by mass of disodium edetate, 20 parts by mass of sodium percarbonate, 15 parts by mass of polyoxyethylene lauryl alcohol Sodium ether sulfate and 5 parts by mass of trimethylsilyl magnesium chloride were dissolved in a mixed solution formed by deionized water. The temperature of the mixed solution was kept at 60° C., and treated with ultrasonic vibration for 30 minutes to remove the surface oxide film. Then move the NdFeB alloy powder into hot water at 80°C and treat it with ultrasonic vibration for 30 minutes, take it out, rinse it with water, and dry it naturally.

[0043] (2) Pl...

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PUM

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Abstract

The invention provides a method for preparing a flexible rare earth bonded neodymium-iron-boron magnet. The method comprises the steps that sodium silicate, sodium carboxymethyl cellulose, potassium carbonate, stearyl citrate, a tetra-functional ethylene oxide / propylene oxide block copolymer, sodium sulfate, ethylene diamine tetraacetic acid, sodium percarbonate, polyethylene glycol monododecyl ether sodium sulfate and trimethylsilyl magnesium chloride are dissolved in deionized water, neodymium-iron-boron alloy powder is added for ultrasonic oscillation, then the materials are laid on a sealing graphite oven filled with hydrogen for ultrasonic treatment, the graphite oven is vacuumized, and neodymium-iron-boron magnetic powder is obtained after standing; poly aryl ether nitrile ketone, polyaspartic acid, polyacrylamide and polyethylene glycol are mixed, then the neodymium-iron-boron magnetic powder is added, stirred and placed in a double-screw mixer for extrusion and grafting, then drying and pelleting are conducted, and the flexible rare earth bonded neodymium-iron-boron magnet is obtained. Experimental results show that the preparation temperature is low, the obtained flexible rare earth bonded neodymium-iron-boron magnet is good in ageing resistance.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a preparation method of a flexible rare earth bonded NdFeB magnet. Background technique [0002] NdFeB material is the permanent magnet material with the strongest comprehensive magnetic properties in the world today. With the technological progress of electronic information, automobile and machinery manufacturing, NdFeB functional materials have developed rapidly. With the advantages of rare earth resources and production costs, my country has vigorously developed the NdFeB industry and has become the world's largest producer and consumer. In 2010, the output actually reached 120,000 tons, and the sales revenue was 9.7 billion yuan, accounting for 85% of the world's total output. [0003] As a sunrise industry, NdFeB industry has new applications and growing points of rare earth permanent magnet NdFeB materials. With the continuous improvement of technology and equipm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08H01F7/02B22F1/00
CPCH01F1/0578H01F7/0215B22F1/142B22F1/10
Inventor 岑振德
Owner 慈溪市磁性材料有限公司