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Preparation method of anti-corrosion rare earth permanent magnet material

A technology of rare earth permanent magnets and preparation steps, which is applied in the direction of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc. It can solve the problems of poor anti-corrosion performance, low working temperature, and low Curie temperature, and achieve thermal shock resistance. The effect of increasing, increasing working temperature, and increasing Curie temperature

Active Publication Date: 2018-05-04
NANTONG CHENGTAI MAGNETIC MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem mainly solved by the present invention is aimed at the poor corrosion resistance of rare earth permanent magnet materials, and the commonly used permanent magnet material Nd 2 Fe 14 The Curie temperature of B compound is low, which leads to the defect of low working temperature, and a preparation method of anti-corrosion rare earth permanent magnet material is provided.

Method used

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  • Preparation method of anti-corrosion rare earth permanent magnet material

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example 1

[0027]Prepare a sodium borohydride solution with a mass fraction of 10%, add a mass fraction of 40% sodium hydroxide solution to the sodium borohydride solution to adjust the pH to 10.8, obtain an alkalized sodium borohydride solution, and prepare a mass fraction of 5% sulfuric acid Ferrous solution, under the protection of nitrogen, add the alkalized sodium borohydride solution dropwise to the ferrous sulfate solution, stir until no bubbles are generated, and obtain a black suspension; Min speed centrifugation for 10 min, remove the supernatant and separate the black precipitate, wash the black precipitate with water and absolute ethanol three times in turn, transfer to a vacuum drying oven with a set temperature of 70°C for 20 h to obtain nano Iron powder: Disperse 30g of nano-iron powder in 100mL of cyclohexane, place it in an ultrasonic oscillator and ultrasonically treat it at a frequency of 30kHz for 15min, filter and separate to obtain ultrasonically treated iron powder,...

example 2

[0029] Prepare a sodium borohydride solution with a mass fraction of 10%, add a mass fraction of 40% sodium hydroxide solution to the sodium borohydride solution to adjust the pH to 10.9, obtain an alkalized sodium borohydride solution, and prepare a mass fraction of 5% sulfuric acid Ferrous solution, under the protection of nitrogen, add the alkalized sodium borohydride solution dropwise to the ferrous sulfate solution, stir until no bubbles are generated, and obtain a black suspension; The speed of centrifugation was 11min, and the supernatant was removed to separate the black precipitate, which was washed with water and absolute ethanol four times in turn, and then transferred to a vacuum drying oven with a set temperature of 75°C for 22 hours to obtain nano Iron powder: Disperse 34g of nano-iron powder in 110mL of cyclohexane, place it in an ultrasonic oscillator and ultrasonically treat it at a frequency of 31kHz for 18min, filter and separate to obtain ultrasonically trea...

example 3

[0031] Prepare a sodium borohydride solution with a mass fraction of 10%, add a mass fraction of 40% sodium hydroxide solution to the sodium borohydride solution to adjust the pH to 11.2, obtain an alkalized sodium borohydride solution, and prepare a mass fraction of 5% sulfuric acid Ferrous solution, under the protection of nitrogen, add the alkalized sodium borohydride solution dropwise to the ferrous sulfate solution, stir until no bubbles are generated, and obtain a black suspension; Min speed centrifugation for 12 minutes, remove the supernatant and separate the black precipitate, wash the black precipitate with water and absolute ethanol for 5 times, then transfer to a vacuum drying oven with a set temperature of 80°C for 24 hours to obtain nano Iron powder: Disperse 35g of nano-iron powder in 120mL of cyclohexane, place it in an ultrasonic oscillator for 20min at a frequency of 32kHz, and then filter and separate to obtain ultrasonically treated iron powder. Disperse the...

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Abstract

The invention relates to the technical field of preparation of rare earth permanent magnet materials, in particular to a preparation method of an anti-corrosion rare earth permanent magnet material. According to the preparation method, after alkalization of a sodium borohydride solution, the sodium borohydride solution is mixed with a ferrous sulfate solution, and nanometer iron powder is obtainedafter treating and is dispersed in cyclohexane; the alkalized sodium borohydride solution is added in; iron / cobalt nanometer powder of a core-shell structure is obtained through treating; the nanometer NdFeB powder and the nanometer iron powder are mixed according to proportion, and dispersion media and surface active substances are added in; magnetic powder slurry is obtained through ball-milling; the magnetic powder slurry is treated, and hard magnetic powder is obtained; after the magnetic powder slurry is mixed with the iron / cobalt nanometer powder of the core-shell structure, treating isperformed, and the rare earth permanent magnet material is obtained; under the high temperature work condition, the iron powder can be protected against oxidization by cobalt, the anti-corrosion performance of the permanent magnet material is improved; under the high temperature work condition, the expanding coefficient of the NdFeB powder is small, the saturation magnetic flux density is improved, the Curie temperature of the NdFeB powder is increased, and therefore the work temperature of the rare earth permanent magnet material rises, and the application prospects are wide.

Description

technical field [0001] The invention relates to the technical field of preparation of rare earth permanent magnet materials, in particular to a preparation method of anti-corrosion rare earth permanent magnet materials. Background technique [0002] Rare earth permanent magnet material is an alloy composed of samarium, neodymium mixed rare earth metals and transition metals (such as cobalt, iron, etc.), pressed and sintered by powder metallurgy, and magnetized by a magnetic field. As one of the most important application fields of rare earths, rare earth permanent magnet materials are important basic functional materials supporting modern society and are closely related to people's lives. [0003] Rare earth permanent magnets are divided into samarium cobalt (Sm-Co) permanent magnets and neodymium iron boron (Nd-Fe-B) permanent magnets. Among them, the magnetic energy product of SmCo magnets is between 15 and 30MGOe, and the magnetic energy product of NdFeB magnets is betwe...

Claims

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Application Information

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IPC IPC(8): B22F3/14B22F3/105B22F1/00B22F1/02B22F9/24
CPCB22F1/0003H01F1/0577H01F41/0253B22F3/105B22F3/14B22F9/24B22F2009/245B22F1/17
Inventor 高俊何少雄张建初
Owner NANTONG CHENGTAI MAGNETIC MATERIAL TECH CO LTD
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