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Sm(Co, Mn) 5 type rare earth permanent magnet material and preparation method thereof

A rare earth permanent magnet and annealing technology, used in magnetic materials, inductance/transformer/magnet manufacturing, furnace types, etc., can solve the problems of insufficient fast quenching performance, affecting saturation magnetization and anisotropy field, etc.

Inactive Publication Date: 2020-02-21
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of the quenched strip obtained by both is not high enough
The main reason is that the removal of SmCo in the obtained quenched strip 5 In addition, there are still Sm 2 co 7 and Sm 2 co 17 The presence of impurity phases will affect the intrinsic magnetic properties such as saturation magnetization and anisotropy field

Method used

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  • Sm(Co, Mn) 5 type rare earth permanent magnet material and preparation method thereof
  • Sm(Co, Mn) 5 type rare earth permanent magnet material and preparation method thereof
  • Sm(Co, Mn) 5 type rare earth permanent magnet material and preparation method thereof

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preparation example Construction

[0037] The present invention provides the Sm(Co,Mn) described in the above scheme 5 The preparation method of type rare earth permanent magnet material comprises the following steps:

[0038] Melting the mixture comprising Sm, Co and Mn to obtain an ingot;

[0039] performing rapid quenching of the ingot to obtain a quenched strip;

[0040] Annealing and quenching are performed sequentially on the quenched strip to obtain Sm(Co,Mn) 5 Type rare earth permanent magnet materials;

[0041] The quality of the Co corresponds to the theoretical quality of Co in Formula 1, and the quality of the Sm is increased by 1 to 5% on the basis of the theoretical Sm quality calculated according to Formula 1; the quality of the Mn corresponds to the theoretical quality of Mn in the Formula 1 .

[0042] In the invention, the mixed material including Sm, Co and Mn is smelted to obtain an ingot.

[0043] In the present invention, the mass of Co corresponds to the theoretical mass of Co in Form...

Embodiment 1

[0055] 1) According to the stoichiometric ratio of SmCo 4.9 mn 0.1 Proportioning, wherein the mass of Sm is the same as that according to the general formula SmCo 4.9 mn 0.1 5% increase compared to the calculated mass;

[0056] 2) Put Sm, Co, and Mn with a purity higher than 99% in the crucible of the induction melting furnace, and vacuumize so that the vacuum degree reaches 2×10 -2 Pa; then fill the cavity with high-purity argon to make the furnace pressure reach 90kPa. Power on; heat up to 1600°C to melt the sample, and stop after 70 seconds of melting; repeat the melting 4 times, and take it out of the furnace for use after the sample is completely cooled;

[0057] 3) Break the alloy ingot and put it into a quartz tube with a nozzle diameter of 20mm and a bottom nozzle diameter of 2mm; put the quartz tube into a melt quenching furnace so that the bottom of the quartz tube is 4mm away from the copper roller; close the cavity, and Vacuumize the cavity of the quick quench...

Embodiment 2

[0060] 1) According to the stoichiometric ratio of SmCo 4.8 mn 0.2 Proportioning, wherein the quality of Sm increases by 5% compared with the quality calculated according to the general formula;

[0061] 2) Put Sm, Co, and Mn with a purity higher than 99% in the crucible of the induction melting furnace, and vacuumize so that the vacuum degree reaches 6×10 -2 Pa; then fill the cavity with high-purity argon to make the furnace pressure reach 80kPa. Power on; heat up to 1500°C to melt the sample, stop after 80 seconds of melting; repeat the melting 5 times, after the sample is completely cooled, take it out of the furnace for use;

[0062] 3) Break the alloy ingot and put it into a quartz tube with a nozzle diameter of 20mm and a bottom nozzle diameter of 1mm; put the quartz tube into the melt quenching furnace so that the bottom of the quartz tube is 2mm away from the copper roller; close the cavity, and Vacuumize the cavity of the quick quenching furnace so that the vacuum ...

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Abstract

The invention relates to the technical field of a permanent magnet material and particularly relates to an Sm(Co, Mn) 5 type rare earth permanent magnet material and a preparation method thereof. TheSm (Co, Mn) 5 type rare earth permanent magnet material is formed by a substance with a chemical composition shown as a formula 1, SmCo(5-x)Mnx (formula 1), wherein x is greatervthan 0 and less than or equal to 0.5. The Sm (Co, Mn) 5 type rare earth permanent magnet material is advantaged in that Mn atoms are doped into SmCo5 by utilizing the characteristics that the Mn atoms have large atomic magnetic moment and the atomic size is close to that of Co, so saturation magnetization intensity of a system is greatly improved; through a series of preparation means, generation of Sm2Co7, Sm2Co17 andother impure phases is inhibited, and an Sm (Co, Mn)5 pure phase is obtained.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to a Sm(Co,Mn) 5 Type rare earth permanent magnet material and preparation method thereof. Background technique [0002] SmCo 5 SmCo of permanent magnet material 5 With a high Curie temperature of 727°C, it can work normally at high temperatures. In terms of preparation technology, the preparation of SmCo 5 The technological process is simpler and the cycle is shorter. Therefore, SmCo 5 Permanent magnet materials are widely used in microwave communication technology, automation technology, transportation, bioengineering, medical equipment, aerospace and military and other fields. Currently, restricting SmCo 5 The main reason for the application of permanent magnet materials is that SmCo 5 The saturation magnetization is low. In addition, the material has poor phase stability and is easy to form Sm 2 co 7 and Sm 2 co 17 and other miscellaneous phases. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/055H01F41/02C22F1/16C21D9/52
CPCC21D9/52C22F1/002C22F1/16H01F1/0551H01F41/0253
Inventor 张红国宋博腾岳明张东涛刘卫强
Owner BEIJING UNIV OF TECH
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