The preparation method of sm-co base alloy bulk magnet

A base alloy, sm-co technology, applied in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of inability to prepare nanocrystalline Sm-Co base alloy bulk magnets, etc.

Active Publication Date: 2018-10-12
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing a Sm-Co-based alloy block magnet, which is a method for preparing a nanocrystalline Sm-Co-based alloy block magnet with obvious magnetocrystalline anisotropy. - Co-based alloy rapid-quenching strips are subjected to high-energy ball milling to prepare Sm-Co-based alloy fully amorphous powder, which is then pressed into a block under a hydraulic press, and finally the pressed Sm-Co-based alloy block is placed in a magnetic field heat treatment furnace Magnetic field heat treatment is carried out to make the amorphous phase recrystallize along the direction of the magnetic field during the heating process, thereby making a nanocrystalline Sm-Co-based alloy block magnet with obvious magnetocrystalline anisotropy, which overcomes the problem that the existing technology can only affect the crystal grains. The defect that nanocrystalline Sm-Co based alloy bulk magnets with obvious preferred orientation cannot be prepared by orientation in micron-scale Sm-Co based alloy bulk magnets

Method used

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  • The preparation method of sm-co base alloy bulk magnet
  • The preparation method of sm-co base alloy bulk magnet
  • The preparation method of sm-co base alloy bulk magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The first step is to prepare raw materials:

[0062] According to the element composition formula SmCo 5 The atomic ratio is used for batching, and the required mass of pure Sm and pure Co is weighed for preparation. The actual weighed mass of Sm is 5wt% higher than the theoretically calculated mass during batching, so as to make up for the Sm in the process of smelting and rapid quenching. volatilization;

[0063] The second step is to prepare SmCo 5 Master alloy ingot:

[0064] Put all the raw materials prepared in the first step into the crucible of the vacuum arc melting furnace, and evacuate the furnace body so that the vacuum degree in the furnace is lower than 5×10 -2 Pa, the temperature of the furnace rises above the melting point of the raw material metal Co, so that the raw materials are completely melted and fully mixed to obtain SmCo 5 master alloy ingot;

[0065] The third step is to prepare SmCo 5 Alloy quick-quenching strip:

[0066] The SmCo produ...

Embodiment 2

[0081] The first step is to prepare raw materials:

[0082] According to the element composition formula SmCo 5 The atomic ratio is used for batching, and the required mass of pure Sm and pure Co is weighed for preparation. The actual weighed mass of Sm is 8wt% higher than the theoretically calculated mass during batching, so as to make up for the Sm in the process of smelting and rapid quenching. volatilization;

[0083] The second step is to prepare SmCo 5 Master alloy ingot:

[0084] With embodiment 1;

[0085] The third step is to prepare SmCo 5 Alloy quick-quenching strip:

[0086] The SmCo produced in the second step 5 The master alloy ingot is placed in a melt quenching furnace, and the furnace is vacuumed to 5×10 -2 Below Pa, the master alloy ingot is re-melted, and then the melt is rapidly quenched on a roller rotating at a peripheral speed of 50m / s to obtain SmCo 5 Alloy quick quenching strip;

[0087] The fourth step is to prepare SmCo 5 Alloy fully amorph...

Embodiment 3

[0097] The first step is to prepare raw materials:

[0098] According to the element composition formula Sm(Co 0.8 Cu 0.2 ) 5 The atomic ratio of Sm is used for batching, and the required mass of pure Sm, pure Co and pure Cu is weighed for preparation. The actual weight of Sm during batching is 6wt% higher than the theoretically calculated quality, so as to make up for smelting and melt Sm volatilization during rapid quenching;

[0099] In the second step, the preparation of Sm(Co 0.8 Cu 0.2 ) 5 Master alloy ingot:

[0100] Put all the raw materials prepared in the first step into the crucible of the vacuum arc melting furnace, and evacuate the furnace body so that the vacuum degree in the furnace is lower than 5×10 -2 Pa, the temperature of the furnace rises above the melting point of the raw metal Co, so that the raw materials are completely melted and mixed thoroughly, and the Sm(Co 0.8 Cu 0.2 ) 5 master alloy ingot;

[0101] The third step is to prepare Sm(Co 0...

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Abstract

The invention provides a preparation method of a Sm-Co-based alloyed lumpish magnet, and relates to rare earth cobalt-based permanent magnet alloy. The preparation method of the Sm-Co based alloyed lumpish magnet is a preparation method for the nano-crystal Sm-Co-based alloyed lumpish magnet with obvious magneto-crystalline anisotropy. Sm-Co-based alloyed fully-amorphous powder is prepared by conducting high-energy ball milling on the Sm-Co-based alloyed rapid-quenching ribbons, then the Sm-Co-based alloyed fully-amorphous powder is pressed into blocks by a hydraulic machine, and finally, the pressed Sm-Co based alloyed blocks are placed into a magnetic thermal treatment furnace to be subjected to magnetic thermal treatment. In the process of heating, the amorphous phase is recrystallized in the direction of the magnetic field, and accordingly the nano-crystal Sm-Co-based alloyed lumpish magnet with obvious magneto-crystalline anisotropy is prepared. By the adoption of the preparation method of the Sm-Co-based alloyed lumpish magnet, the defects are overcome that by the adoption of the prior art, only the Sm-Co-based alloyed lumpish magnet of micron-scaled grain sizes can be oriented and the nano-crystal Sm-Co-based alloyed lumpish magnet with obvious preferential orientation cannot be produced.

Description

technical field [0001] The technical scheme of the invention relates to a rare earth cobalt-based permanent magnet alloy, specifically a method for preparing a Sm-Co-based alloy block magnet. Background technique [0002] Rare-earth permanent magnet materials are an important basic functional material, among which Sm-Co-based permanent magnet alloys have an irreplaceable position in high-temperature applications due to their excellent permanent magnetic properties and high-temperature stability. The traditional preparation process of Sm-Co-based permanent magnet alloy is: melting - powder making - magnetic orientation forming - sintering, but the crystal grains of the block magnet obtained by this method are micron. For permanent magnet alloys, the coercive force depends on the difficulty of forming reverse domains inside the material, and the grain size of the magnet plays a decisive role in the formation of reverse domains, that is, the smaller the grain size, the smaller ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/055H01F1/08H01F41/02C22C19/07B22F9/04
CPCB22F9/04C22C19/07H01F1/0552H01F1/0557H01F41/0266
Inventor 孙继兵韩续豪李英韩瑞平崔春翔
Owner HEBEI UNIV OF TECH
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