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High-performance and high-resistivity sintered samarium-cobalt permanent-magnet material and preparation method and application thereof

A high-resistivity, permanent magnet material technology, applied in the direction of magnetic materials, inductance/transformer/magnet manufacturing, magnetic circuits characterized by magnetic materials, etc., to achieve the effects of small size, convenient mass production, and high magnetic performance

Active Publication Date: 2018-07-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a high-performance high-resistivity sintered samarium-cobalt permanent magnet material and its preparation method and application, so as to overcome the deficiencies of the existing sintered samarium-cobalt materials

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  • High-performance and high-resistivity sintered samarium-cobalt permanent-magnet material and preparation method and application thereof
  • High-performance and high-resistivity sintered samarium-cobalt permanent-magnet material and preparation method and application thereof
  • High-performance and high-resistivity sintered samarium-cobalt permanent-magnet material and preparation method and application thereof

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preparation example Construction

[0046] Another aspect of the embodiments of the present invention also provides a method for preparing a high-performance and high-resistivity sintered samarium-cobalt permanent magnet material, which includes:

[0047] According to the chemical formula Sm(Co 1-a-b-c Fe a Cu b Zr c m y ) z Ingredients, where 0<a<0.5, 0<b<0.15, 0<c≤0.025, 0<y≤0.04, 6.5<z<8.5;

[0048] The alloy obtained after batching is sequentially subjected to orientation molding, sintering, heat treatment, and isothermal aging treatment to obtain a high-performance and high-resistivity sintered samarium-cobalt permanent magnet material, whose chemical formula is Sm(Co 1-a-b-c Fe a Cu b Zr c m y ) z , where 0<a<0.5, 0<b<0.15, 0<c≤0.025, 0<y≤0.04, 6.5<z<8.5, M is a high resistivity element.

[0049] In some embodiments, the high-resistivity element includes any one or a combination of two or more of In, Ga, Si, Ti, Na, Zr, B, Ca, Mg, Ge, Sn, and Bi, etc., But not limited to this.

[0050] In some...

Embodiment 1

[0080] (1) Ingredients: According to the stoichiometric formula Sm(Co 0.785 Fe 0.09 Cu 0.09 Zr 0.025 In 0.01 ) 7.68 Raw materials are weighed in the proportioning of each element;

[0081] (2) Smelting: put the raw materials prepared in step (1) into the vacuum induction melting furnace, cover the furnace cover and vacuumize to 5×10 -2 Pa, then bake at a lower temperature to remove the water vapor and gas adsorbed on the surface of the raw material, after the vacuum is stable (-2 Pa), and then filled with 0.06MPa high-purity argon (99.999%). Gradually increase the heating power, after the raw materials are completely melted, reduce the heating power, keep warm for 2 to 5 minutes, then pour into the water-cooled copper mold, and finally obtain the alloy ingot;

[0082] (3) Milling: Coarsely crush the alloy ingot smelted in step (2) to alloy particles with a size of 0.1-0.5 mm; then, the coarsely crushed alloy particles are made into a fine powder of 2-3 μm by jet mill to ...

Embodiment 2

[0088] The preparation method of the high-performance high-resistivity sintered samarium-cobalt permanent magnet material in this embodiment is basically the same as that of embodiment 1, the difference being that the proportioning of each element is: Sm(Co 0.78 Fe 0.09 Cu 0.09 Zr 0.025 In 0.015 ) 7.68 .

[0089] The scanning electron microscope photos of the microstructure of the high-performance and high-resistivity sintered samarium-cobalt permanent magnet material prepared in this example can be found in Figure 4 shown. Depend on Figure 4 It can be seen that the microstructure of the high-performance and high-resistivity sintered SmCo permanent magnet material is mainly composed of the main phase of the SmCo matrix and the grain boundary phase. The grain boundary phase is distributed along the grain boundary, and the grain size of the main phase is 100 μm. The size of the boundary phase was 10 μm. See Table 2 for the magnetic properties and resistivity parameters...

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Abstract

The invention provides a high-performance and high-resistivity sintered samarium-cobalt permanent-magnet material and preparation method and application thereof. The chemical formula of the high-performance and high-resistivity sintered samarium-cobalt permanent-magnet material is Sm<Co<1-a-b-c>FeCuZr<c>M<y>)<z>, wherein a is more than 0 but less than 0.5, b is more than 0 but less than 0.15, c is more than 0 but less than or equal to 0.025, y is more than 0 but less than 0.04, z is more than 6.5 but less than 8.5, and M is a high-resistivity element. The preparation method comprises thestep of sequentially performing processes of directional formation, sintering, thermal processing and equal-temperature aging on alloy with the chemical formula being Sm<Co<1-a-b-c>FeCuZr<c>M<y>)<z> to obtain the high-performance and high-resistivity sintered samarium-cobalt permanent-magnet material. Compared with the prior art, the samarium-cobalt permanent-magnet material has the advantages that a high-resistivity compound is combined without a complicated process, the process flow of the sintered samarium-cobalt magnet is not needed to be changed, the production cost is low, and theresistivity of the magnet can be obviously improved.

Description

technical field [0001] The invention relates to a samarium-cobalt permanent magnet material, in particular to a high-performance and high-resistivity sintered samarium-cobalt permanent magnet material and its preparation method and application, belonging to the technical field of rare earth permanent magnet materials. Background technique [0002] Rare earth permanent magnet materials are prone to thermal demagnetization at high temperatures, and motors with the same power are small in size, and it is relatively difficult to dissipate heat from the rotor. The eddy current loss and temperature rise in the rotor will directly threaten the service life and reliability of high-speed permanent magnet motors. Therefore, It is necessary to reduce the eddy current loss of the rotor of the high-speed permanent magnet motor and reduce the temperature rise. Improving the resistivity of permanent magnets is one of the effective ways to reduce the eddy current loss of rare earth permanen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/055H01F1/09H01F41/02H02K1/02
CPCH01F1/0557H01F1/09H01F41/0253H01F41/0266H02K1/02
Inventor 刘壮闫阿儒厉天翼张超越刘雷陈仁杰李东
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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