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Sm-co base and nd-fe-b base composite magnet and preparation method thereof

A composite magnet, nd-fe-b technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of difficult to obtain composite magnets, to improve grain integrity, enhance orientation, The effect of preventing the spread of elements

Active Publication Date: 2015-12-09
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to obtain this kind of composite magnet with traditional processing technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The composition of the hard magnetic phase Nd-Fe-B is as follows according to the weight percentage of each element:

[0025] Nd:Fe:B:Al=32.2:66.27:1.03:0.5;

[0026] The composition of the hard magnetic phase Sm-Co is as follows according to the weight percentage of each element:

[0027] Sm:Co:Cu:Fe:Zr=33:66:0.2:0.6:0.2

[0028] The hard magnetic phase Nd-Fe-B alloy and the hard magnetic phase Sm-Co alloy are smelted in a vacuum intermediate frequency smelting furnace, and the ingots are subjected to homogenizing vacuum heat treatment at 650°C and 1100°C for 2 hours, then coarsely crushed, and placed in hydrogen Hydrogen explosion in the explosion furnace, hard magnetic phase Nd-Fe-B ball milled to 3.5 microns, another hard magnetic phase Sm-Co ball milled to 200 nanometers.

[0029] The hard magnetic phase Nd-Fe-B-Al quick-setting alloy is smelted in a vacuum intermediate frequency quick-setting smelting furnace, and then placed in a hydrogen explosion furnace for ...

Embodiment 2

[0033] The composition of the hard magnetic phase Nd-Fe-B is as follows according to the weight percentage of each element:

[0034] Nd:Fe:B:Al=32.2:66.27:1.03:0.5;

[0035] The composition of the hard magnetic phase Sm-Co is as follows according to the weight percentage of each element:

[0036] Sm:Co=33.75:66.25;

[0037] The hard magnetic phase Nd-Fe-B alloy and the hard magnetic phase Sm-Co alloy are smelted in a vacuum intermediate frequency smelting furnace, and the ingots are subjected to homogenization vacuum heat treatment at 600 ° C and 1100 ° C for 2 hours, and then placed in a hydrogen explosion furnace Hydrogen explosion, the hard magnetic phase Nd-Fe-B particle size is milled to 3.5 microns by jet milling, and the other hard magnetic phase Sm-Co is ball milled to 20 nanometers.

[0038] The nano hard magnetic phase powder and the micron hard magnetic phase powder are evenly mixed, and the content of the nano hard magnetic phase powder in the mixture is 50wt%. ...

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Abstract

The invention discloses an Sm-Co base and Nd-Fe-B base composite magnet and a preparation method thereof, belonging to the field of a magnetic material and preparation thereof. The composite magnet is formed by compounding hard magnet phase Sm-Co and hard magnet phase Nd-Fe-B, wherein Nd-Fe-B base micron grain hard magnet parent phase is subjected to exchange coupling with Sm-Co base nanometer grain hard magnet phase dispersed in the Nd-Fe-B base micron grain hard magnet parent phase. Thus, the two hard magnet phases are excellently compounded together, and the composite magnet has higher magnetic energy product than an Sm-Co base permanent magnet; and the composite magnet has better temperature stability than Nd-Fe-B base magnet and thus can achieve better application in each field.

Description

technical field [0001] The invention relates to a Sm-Co-based and Nd-Fe-B-based composite magnet and a preparation method thereof, in particular to a method for synthesizing a composite magnet with a hard magnetic phase and another hard magnetic phase, belonging to the technical field of magnetic materials. Background technique [0002] Although the current third-generation rare earth permanent magnet has almost reached its theoretical maximum energy product, it is not suitable for all applications. Therefore, it is very desirable to prepare an ideal permanent magnet (with high magnetization, high coercive force and high Curie temperature) and its cost is low. [0003] Although great efforts have been devoted to finding new permanent magnets after the discovery of NdFeB, no single compound or alloy has been found to possess the required high performance. [0004] Sm-Co based magnets have good temperature stability but low magnetization and energy product, while Nd-Fe based ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/047H01F7/02H01F41/02
Inventor 张雪峰徐来自马强李永峰刘艳丽史孟飞
Owner INNER MONGOLIA UNIV OF SCI & TECH
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