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Composite permanent magnet material and preparation method and application thereof

A composite permanent magnet material and magnetic powder technology, which is applied in magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems of poor temperature stability, high temperature coefficient of coercive force of magnetic powder or rare earth permanent magnet materials, etc. Achieve the effect of low production cost, good temperature stability and low absolute value

Active Publication Date: 2022-02-18
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the magnetic powder or rare earth permanent magnet material prepared by the above method has a high temperature coefficient of coercive force and poor temperature stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The present embodiment provides a kind of preparation method of composite permanent magnet material, and described preparation method comprises the following steps:

[0048] (1) Mix metal samarium powder and metal iron powder according to the molar ratio of 2.2:17, carry out solid phase diffusion reaction at 1000 ℃ for 12 hours with the powder after mixing, generate Sm-Fe alloy; described Sm-Fe alloy is roughly broken into particles with an average particle size of 0.1-1mm, and put the Sm-Fe alloy particles in a tube furnace, heat them to 500°C under the condition of ammonia gas, and keep them for 6 hours to obtain the main phase of Sm 2 Fe 17 N x The samarium-iron-nitrogen magnetic material; crushing the samarium-iron-nitrogen magnetic material into the first magnetic powder with an average particle size of 1-3 μm in a nitrogen atmosphere;

[0049] (II)SrCO 3 Powder, La 2 o 3 Powder, CaCO 3 Powder, Fe 2 o 3 Powder and Co 2 o 3 Powder according to Sr 1-x- y ...

Embodiment 2

[0052] The present embodiment provides a kind of preparation method of composite permanent magnet material, and described preparation method except that the mass ratio of first magnetic powder, described second magnetic powder and polyamide 12 powder in step (III) is 50:43:7, other All the same as in Example 1.

Embodiment 3

[0054] This embodiment provides a kind of preparation method of composite permanent magnet material, described preparation method is except that the mass ratio of the first magnetic powder in step (III), described second magnetic powder and polyamide 12 powder is 88:2:10, the other All the same as in Example 1.

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Abstract

The invention provides a composite permanent magnet material and a preparation method and application thereof, the composite permanent magnet material comprises first magnetic powder, second magnetic powder and binder powder, the mass ratio of the first magnetic powder to the second magnetic powder to the binder powder is (50-90): (3-43): (7-10), the first magnetic powder comprises Sm < 2 > Fe < 17 > N < x > magnetic powder, the chemical formula of the second magnetic powder is Sr < 1-x-y > La < x > Ca < y > Fe < 12-z > Co < z > O < m >, x is 0.3-0.6, y is 0.1-0.4, z is 0.2-0.4, and m is 18.5-19.5. The preparation method comprises the following steps: mixing the first magnetic powder, the second magnetic powder and the binder powder according to a specific mass ratio, and carrying out mixing granulation. The preparation method is simple to operate, the rare earth raw materials samarium, strontium and lanthanum are relatively cheap and easy to obtain, and the prepared composite permanent magnet material is low in coercive force temperature coefficient, good in temperature stability and suitable for various miniature special motors.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a composite permanent magnet material and its preparation method and application. Background technique [0002] In recent years, due to the extensive use of rare earth NdFeB permanent magnet materials in air-conditioning compressors, new energy vehicles, wind power generation and other fields, the prices of rare earth Nd and Pr have risen rapidly. How to use relatively surplus rare earth resources such as cheap Sm and Ce, It has become a hot spot in the field of magnetic materials. [0003] SM 2 Fe 17 N x The saturation magnetization of the compound is 1.54T, and Nd 2 Fe 14 The 1.6T equivalent of compound B, Sm 2 Fe 17 N x The Curie temperature of the compound is 470°C and the anisotropy field is 14T, both of which are higher than those of Nd 2 Fe 14 Compound B, the above-mentioned excellent intrinsic magnetic properties make Sm 2 Fe 17 N x The compound is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/055H01F1/059H01F41/02
CPCH01F1/059H01F1/0558H01F1/0557H01F1/0551H01F41/0253
Inventor 李玉平孙永阳张云逸蒋云涛
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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