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Preparation method of high-temperature 2 : 17 type sintered samarium-cobalt magnet

A samarium-cobalt magnet, high-temperature technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of not improving the high-temperature magnetic properties of magnets, achieve high coercive force, uniform heating, and improve magnetic properties Effect

Active Publication Date: 2022-01-07
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent discloses "Microwave aging treatment method for samarium-cobalt-based rare earth permanent magnet materials" (publication number: CN104233138A), which uses microwave heating and heat preservation to perform secondary artificial aging or multi-stage artificial aging, the purpose of which is to refine the cellular tissue structure , to improve the saturation magnetization and mechanical properties of the magnet, but it does not improve the high temperature magnetic properties of the magnet

Method used

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  • Preparation method of high-temperature 2 : 17 type sintered samarium-cobalt magnet
  • Preparation method of high-temperature 2 : 17 type sintered samarium-cobalt magnet
  • Preparation method of high-temperature 2 : 17 type sintered samarium-cobalt magnet

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preparation example Construction

[0036] The invention provides a method for preparing a high-temperature 2:17 type sintered samarium-cobalt magnet, which comprises the following steps:

[0037] S1, prepare alloy ingot:

[0038] First, take the samarium-cobalt alloy raw material according to the following weight percentage: (Sm 1-x Re x ): 25~27%, Fe: 5~10%, Zr: 2.5~3.5%, Cu: 6~8%, the balance is Co; among them, 0≤x≤0.4, Re is Gd, Dy, Tb, Er One or more of them; since the 1:5H cell wall phase has a higher rare earth content than the 2:17R cell phase, a rare earth content of 25-27% by mass can ensure that the magnet will be wider in the subsequent aging treatment process. the cell wall phase;

[0039] Then, the weighed samarium-cobalt alloy raw material is melted in a medium-frequency induction melting furnace, and cast in a single-sided water-cooled plate copper mold to obtain an alloy ingot;

[0040] S2, jet mill powder:

[0041] Mechanically breaking the alloy ingot prepared in step S1 into alloy particle...

Embodiment 1

[0063] A method for preparing a high-temperature 2:17 type sintered samarium-cobalt magnet, comprising the following steps:

[0064] S1, prepare alloy ingot:

[0065] First, weigh the samarium-cobalt alloy raw materials according to the following weight percentages: Sm: 26%, Fe: 5.5%, Zr: 3.1%, Cu: 7.2%, Co: 58.2%;

[0066] Then, the weighed samarium-cobalt alloy raw material is melted in a medium-frequency induction melting furnace, and cast in a single-sided water-cooled plate copper mold to obtain an alloy ingot;

[0067] S2, jet mill powder:

[0068] Mechanically breaking the alloy ingot prepared in step S1 into alloy particles with a particle size of 0.4-2mm;

[0069] Then, the alloy particles are fully mixed with the antioxidant to obtain a mixture, and the mixture is made into an alloy powder with an average particle size range of 4.5 μm by means of jet milling;

[0070] S3, magnetic field orientation forming, cold isostatic pressing:

[0071] Orienting the samarium...

Embodiment 2

[0077] A method for preparing a high-temperature 2:17 type sintered samarium-cobalt magnet, comprising the following steps:

[0078] S1, prepare alloy ingot:

[0079] First, weigh the samarium-cobalt alloy raw material according to the following weight percentages: Sm: 25.5%, Fe: 9.5%, Zr: 3%, Cu: 6.5%, Co: 55.5%;

[0080] Then, the weighed samarium-cobalt alloy raw material is melted in a medium-frequency induction melting furnace, and cast in a single-sided water-cooled plate copper mold to obtain an alloy ingot;

[0081] S2, jet mill powder:

[0082] Mechanically breaking the alloy ingot prepared in step S1 into alloy particles with a particle size of 0.4-2mm;

[0083] Then, the alloy particles are fully mixed with the antioxidant to obtain a mixture, and the mixture is made into an alloy powder with an average particle size range of 3 μm by a jet milling method;

[0084] S3, magnetic field orientation forming, cold isostatic pressing:

[0085] Orienting the samarium-co...

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Abstract

The invention relates to a preparation method of a high-temperature 2: 17 type sintered samarium-cobalt magnet, belongs to the technical field of magnetic material preparation, and solves the technical problem of high-temperature magnetic performance of the 2: 17 type sintered samarium-cobalt magnet. According to the technical scheme, the method comprises the following steps of alloy ingot preparation, jet milling powder preparation, magnetic field orientation forming and cold isostatic pressing, sintering and solution treatment, and aging treatment for preparing the samarium-cobalt magnet. A microwave aging heat treatment method is adopted for aging treatment, and comprises the steps: firstly, conducting heat preservation at the temperature of 900-920 DEG C to form a Cu element net-shaped enrichment area; then keeping the temperature at 850-870 DEG C, so that the magnet obtains a large cell size and a wide cell wall phase; and then preserving heat at 800-830 DEG C to obtain a more complete cellular tissue structure. According to the invention, the magnet can obtain a uniform and complete cellular organization structure, cells and cell wall phases have higher domain wall energy difference at 500 DEG C, and the high-temperature magnetic performance of the magnet is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation, and in particular relates to a preparation method of a high-temperature 2:17 type sintered samarium-cobalt magnet. Background technique [0002] Since the advent of rare earth permanent magnet materials in the 1960s, they have been favored for their excellent magnetic properties, and have developed rapidly in scientific research, production and application. Among them, the 2:17 type samarium cobalt permanent magnet material, which is the second-generation rare earth permanent magnet material, has the characteristics of high Curie temperature, excellent magnetic properties, good temperature stability, and excellent oxidation and corrosion resistance. It is widely used in many fields such as national defense and military industry, aerospace, high-precision instruments, medical equipment, microwave devices, sensors, various magnetic transmission devices, and high-end motors. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02
CPCH01F41/02Y02P10/25
Inventor 王帅胡季帆雍辉吴铭
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY