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A kind of graphene modified sintered NdFeB permanent magnet material and preparation method thereof

A technology of graphene modification and permanent magnetic materials, which is applied in the direction of magnetic materials, magnetic objects, metal processing equipment, etc., can solve problems such as limited applications, and achieve the effect of increasing coercive force and improving distribution

Inactive Publication Date: 2018-06-19
JIANGXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low Curie temperature of rare earth permanent magnet materials leads to irreversible loss of magnetic flux at high temperatures, which greatly limits its application, especially in high temperature environments, so the coercive force and temperature stability of NdFeB permanent magnets can be improved gradually become an important research direction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Prepare 0.1 g of graphene powder (0.1% of the total weight), 99.9 g of NdFeB powder (99.9% of the total weight), prepare 100 g of sintered powder, and put it into a glass.

[0023] 2) Pour 0.5ml (0.4% of the total weight of the sintered powder) absolute ethanol and 0.04ml (0.036% of the total weight of the sintered powder) tetrabutylammonium hydroxide into the beaker, mechanically stir the powder at 5rpm for 5min, and let it stand 5min, then pour 0.1ml (0.08% of the total weight of the sintered powder) absolute ethanol and 0.04ml (0.036% of the total weight of the sintered powder) tetrabutylammonium hydroxide, mechanically stir the powder at a speed of 25rpm for 10min, stand still for 5min, and then Pour 0.1ml (0.08% of the total weight of the sintered powder) absolute ethanol and 0.04ml (0.036% of the total weight of the sintered powder) tetrabutylammonium hydroxide, mechanically stir the powder at a speed of 50rpm for 5min, and let stand for 3min. If you pour (0.56...

Embodiment 2

[0027] The preparation method is the same as in Example 1, except that the prepared sintered powder contains 0.5 grams of graphene powder (0.5% of the total weight) and 99.5 grams of NdFeB powder (99.5% of the total weight).

[0028] After cooling, the graphene-modified NdFeB permanent magnet material was obtained. The measured average coercive force was 11.9kOe, the average remanence was 1.29T, and the average Curie temperature was 592K.

Embodiment 3

[0030] The preparation method was the same as in Example 1, except that the prepared sintered powder contained 3.0 grams of graphene powder (3% of the total weight) and 97.0 grams of NdFeB powder (97% of the total weight).

[0031] After cooling, the graphene-modified NdFeB permanent magnet material was obtained. The measured average coercive force was 12.5kOe, the average remanence was 1.35T, and the average Curie temperature was 595K.

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PUM

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Abstract

The invention discloses a graphene modified sintered NdFeB permanent magnet material and a preparation method thereof. In the mixing process of graphene and NdFeB powder, absolute ethanol and tetrabutylammonium hydroxide are added in three times, and absolute ethanol and tetrabutylammonium hydroxide are added each time. The amount of tetrabutylammonium hydroxide added must be coordinated with the mechanical stirring speed. The temperature of the sintering process is not lower than 790°C and not higher than 810°C, the cavity pressure is not lower than 45MPa and not higher than 55MPa, and the time is not lower than 4 minutes and not higher than 810°C. higher than 6 minutes. The present invention can significantly improve the distribution of graphene in the NdFeB permanent magnet material, enhance the material coercivity, remanence, and Curie temperature, and the average coercive force of the graphene-modified NdFeB permanent magnet material in the method can be Up to 11.5kOe, the average remanence can reach 1.22T, and the average Curie temperature can reach 591K.

Description

technical field [0001] The invention relates to the field of permanent magnet materials, in particular to a graphene modified sintered NdFeB permanent magnet material and a preparation method of the material. Background technique [0002] Since the development of the first generation of permanent magnet materials at the end of the nineteenth century, the development of new permanent magnet materials with better performance has been an important direction pursued by relevant industries and academic circles, and the advent of the third generation of NdFeB permanent magnet materials has greatly promoted The development and application of permanent magnetic materials. NdFeB permanent magnets have a larger maximum energy product than other materials, up to 460 kJ / m 3 , and the research is relatively mature, and has been widely used in the production of computer hard drives, mobile phones, wind power and automatic traction devices. The low Curie temperature of rare earth permane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B22F1/00H01F1/057
CPCH01F1/0577B22F3/105B22F2999/00B22F1/10B22F2202/13
Inventor 杨牧南汪航龚留奎张敏范国强
Owner JIANGXI UNIV OF SCI & TECH