High temperature rare earth permanent magnetic material and its preparation method

A rare earth permanent magnet, high temperature technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problem of difficult to meet the use temperature

Inactive Publication Date: 2004-05-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The maximum service temperature of ordinary 2:17 SmCo permanent magnets is 300°C, its intrinsic coercive force Hci at room temperature is about 1592kA / m, and the temperature coefficient of coercive force is -0.3% / °C, which is difficult to meet the requirements of national defense and military fields The use temperature of the material is above 350°C

Method used

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  • High temperature rare earth permanent magnetic material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The ingredients are Sm: 24.5%, Co: 48.5%, Fe: 15%, Cu: 9%, Zr: 3%. The raw materials are smelted at 1325°C and then powdered, and then the magnetic field is 1194kA / m and the pressure is 300MPa. forming;

[0022] Sintering process: vacuum pre-sintering at 1190°C for 30 minutes, then sintering at 1210°C for 60 minutes under an argon protective atmosphere, then solid solution treatment at 1180°C for 120 minutes, and then air-cooled;

[0023] Aging treatment process: keep warm at 830°C for 20 hours, then cool to 370°C at a cooling rate of 0.5°C / min, keep warm for 15 hours, and then take out the furnace for air cooling. The magnetic properties of the obtained patterns are listed in Table 1, and the relationship between the irreversible rate of magnetic flux (η) and temperature is listed in Table 2.

[0024] test

[0025] temperature(°C)

Embodiment 2

[0027] The ingredients are Sm: 25%, Co: 48%, Fe: 16.5%, Cu: 8%, Zr: 2.5%. The raw materials are smelted at 1330°C and then powdered, and then the magnetic field is 1194kA / m and the pressure is 400MPa. forming;

[0028] Sintering process: vacuum pre-sintering at 1190°C for 30 minutes, then sintering at 1210°C for 60 minutes under an argon protective atmosphere, then solid solution treatment at 1180°C for 120 minutes, and then air-cooled;

[0029] Aging treatment process: keep warm at 830°C for 20 hours, then cool to 370°C at a cooling rate of 0.5°C / min, keep warm for 15 hours, and then take out the furnace for air cooling. The magnetic properties of the obtained patterns are listed in Table 3, and the relationship between the irreversible loss rate of magnetic flux (η) and temperature is listed in Table 4.

[0030] test

[0031] temperature(°C)

Embodiment 3

[0033] The ingredients are Sm: 25.5%, Co: 47.5%, Fe: 16%, Cu: 8%, Zr: 3%. The raw materials are smelted at 1335°C and then powdered, and then the magnetic field is 1592kA / m and the pressure is 600MPa. forming;

[0034] Sintering process: vacuum pre-sintering at 1190°C for 30 minutes, then sintering at 1210°C for 60 minutes under an argon protective atmosphere, then solid solution treatment at 1180°C for 120 minutes, and then air-cooled;

[0035] Aging treatment process: keep warm at 850°C for 20 hours, then cool to 370°C at a cooling rate of 0.5°C / min, keep warm for 15 hours, and then take out the furnace and air-cool. The magnetic properties of the obtained patterns are listed in Table 5, and the relationship between the irreversible loss rate of magnetic flux (η) and temperature is listed in Table 6.

[0036] test

[0037] temperature(°C)

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Abstract

The invention relates to powder metallurgic method for manufacturing rare earth permanent magnet material Sm2 (Co, Pe, Cu, Zr)17, especially for designing component of 2:17 type SmCo permanent magnet as well as optimizing preparation technique. Thus, application temperature of the material is raised to 400 deg.C so as to meet requirement on the permanent magnet of electric equipment utilized in national defense and arms industry under high temperature environment.

Description

Technical field: [0001] The invention relates to the manufacture of rare earth permanent magnet material Sm by powder metallurgy 2 (Co, Fe, Cu, Zr) 17 . Background technique: [0002] The maximum service temperature of ordinary 2:17 SmCo permanent magnets is 300°C, its intrinsic coercive force Hci at room temperature is about 1592kA / m, and the temperature coefficient of coercive force is -0.3% / °C, which is difficult to meet the requirements of national defense and military fields The use temperature of the material is required to be above 350°C. Invention content: [0003] The purpose of the present invention is to optimize the preparation process by designing the composition of the 2:17 type SmCo permanent magnet, and increase the service temperature of the material to above 400°C. [0004] Technical scheme of the present invention is: [0005] 1. Composition design. Partially replace Co with Fe, Cu, Zr; the proportion (weight percentage) of each element is Sm: 24.5-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053H01F1/08
Inventor 易健宏彭元东李丽娅曾庆灵付应生
Owner CENT SOUTH UNIV
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