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Preparation method of samarium-cobalt magnet with low sintering temperature and high knee point magnetic field

A low sintering temperature, samarium cobalt magnet technology, applied in the direction of inductor/transformer/magnet manufacturing, electrical components, circuits, etc., can solve the problem of no effective method for high-knee magnetic field magnets, etc., to overcome the low knee magnetic field, improve Knee point magnetic field, the effect of reducing volatilization loss

Active Publication Date: 2021-09-21
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the Chinese patent discloses "a samarium-cobalt permanent magnet containing a grain boundary phase and its preparation method" (application number: 201811313384.7), which forms a copper-rich grain boundary by adding micron-scale or nano-scale CuO powder phase, thereby increasing the coercive force of the magnet, but it is added with CuO powder, which has no effect on reducing the sintering temperature of the magnet, and no effective method for preparing a high knee point magnetic field magnet has been proposed

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  • Preparation method of samarium-cobalt magnet with low sintering temperature and high knee point magnetic field

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preparation example Construction

[0042] Such as figure 1 A kind of preparation method of shown a kind of low sintering temperature high knee point magnetic field samarium cobalt magnet, it comprises the following several steps:

[0043] S1. Preparation of alloy particles A:

[0044] First, take the samarium-cobalt alloy raw material according to the following weight percentage: (Sm 1-x Re x): 24~26%, Fe: 6~25%, Zr: 2~3.5%, Cu: 2~8%, the balance is Co; among them, 0≤x≤0.6, Re is Pr, Nd, Gd, Dy , Tb, Er in one or more. Usually the mass percent content of the rare earth element Sm or the mixture of the rare earth element Sm and other rare earth elements in the samarium cobalt alloy raw material is 25~27%. Under the same performance requirements, the rare earth element Sm or the mixture of the rare earth element Sm and other rare earth elements The content is 1% lower than the prior art content, which is due to the addition of tin-copper alloy powder in this specific embodiment, which effectively reduces the ...

Embodiment 1

[0068] A method for preparing a samarium cobalt magnet with a low sintering temperature and a high knee point magnetic field, comprising the following steps:

[0069] S1. Preparation of alloy particles A:

[0070] First, weigh the samarium-cobalt alloy raw material according to the following weight percentages: Sm: 25%, Fe: 15%, Zr: 2.8%, Cu: 4%, Co: 53.2%;

[0071] Then, the weighed samarium-cobalt alloy raw material was melted in a medium-frequency induction melting furnace, and cast in a single-sided water-cooled plate copper mold to obtain an alloy ingot with an average thickness of 10 cm;

[0072] Finally, the alloy ingot is mechanically crushed into alloy particles A with a particle size of 0.4-2mm;

[0073] S2. Preparation of auxiliary material powder B:

[0074] First, configure the tin-copper alloy raw material according to the following weight percentages: Sn: 20%, Cu: 80%;

[0075] Then, the weighed tin-copper alloy raw material is melted, and a tin-copper alloy ...

Embodiment 2

[0087] A method for preparing a samarium cobalt magnet with a low sintering temperature and a high knee point magnetic field, comprising the following steps:

[0088] S1. Preparation of alloy particles A:

[0089] First, weigh the samarium-cobalt alloy raw materials according to the following weight percentages: Sm: 26%, Fe: 6.5%, Zr: 3.3%, Cu: 7.8%, Co: 56.4%;

[0090] Then, the weighed samarium-cobalt alloy raw material was melted in a medium-frequency induction melting furnace, and cast in a single-sided water-cooled plate copper mold to obtain an alloy ingot with an average thickness of 10 cm;

[0091] Finally, the alloy ingot is mechanically crushed into alloy particles A with a particle size of 0.4-2mm;

[0092] S2. Preparation of auxiliary material powder B:

[0093] First, configure the tin-copper alloy raw material according to the following weight percentages: Sn:50%, Cu:50%;

[0094] Then, the weighed tin-copper alloy raw material is melted, and a tin-copper allo...

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Abstract

The invention relates to a preparation method of a samarium-cobalt magnet with a low sintering temperature and a high knee point magnetic field, and belongs to the technical field of magnetic material preparation. The preparation method comprises the following steps: (1) preparing alloy particles A with the particle size of 0.4-2 mm; (2) preparing auxiliary material powder B with the particle size of 20-100 [mu]m; (3) mixing the alloy particles A and the auxiliary material powder B, and then performing ball milling to prepare samarium-cobalt alloy powder; (4) carrying out magnetic field orientation forming on the samarium-cobalt alloy powder, and then carrying out cold isostatic pressing to prepare a green body; and (5) carrying out sintering solid solution and aging treatment on the green body to prepare the samarium-cobalt magnet. The sintering temperature of the samarium-cobalt magnet can be effectively reduced, the volatilization loss of rare earth in the sintering process is reduced, the grain boundary of the prepared sintered samarium-cobalt magnet has a good cellular organization structure, and the magnet has a high knee point magnetic field (larger than 20 kOe).

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 samarium-cobalt magnet with a low sintering temperature and a high knee-point magnetic field. 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 transmissio...

Claims

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Application Information

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IPC IPC(8): H01F41/02C22C1/04C22C19/07B22F1/00B22F5/00
CPCH01F41/02C22C1/0441C22C19/07B22F5/00
Inventor 王帅胡季帆雍辉吴铭
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY