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Anisotropic SmCo/MnBi composite magnet, and preparation method thereof

A composite magnet and anisotropic technology, applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of low saturation magnetization, large remanence temperature coefficient, and low maximum energy product of magnets, etc., to achieve Improve the density, increase the degree of orientation, and suppress the effect of interdiffusion

Active Publication Date: 2019-03-08
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the MnBi alloy, as the temperature rises, the lattice parameters change, so that the magnet obtains a large positive temperature coefficient, and the intrinsic coercive force at 550K can reach 2.7T. However, MnBi has a lower saturation magnetization and Larger remanence temperature coefficient, resulting in lower maximum energy product of the magnet at high temperature

Method used

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  • Anisotropic SmCo/MnBi composite magnet, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Preparation of SmCo-based magnetic powder: according to the mass ratio of Sm 22 co 39 tm 39 (TM=Fe, Cu, Zr) batching and induction smelting into ingots, then rolling ball milling into 2-5μm magnetic powder, orientation molding to make compacts, and sintering solid solution treatment at 1190ºC+1140ºC for 10 hours , and then aging treatment, first at 750 ºC for 20h, then cooled to 400 ºC for 0.5h and then quenched. Finally, the magnet was crushed to 60 μm by a planetary ball mill to obtain SmCo-based magnetic powder.

[0018] 2) Preparation of MnBi magnetic powder: according to the chemical formula Mn 21 Bi 79 Batching and induction smelting into ingots, the MnBi quenching belt was prepared by the melt quenching method, the roll speed was 30m / s; then the MnBi quenching belt was subjected to aging treatment at 350ºC, and the aging time was 0.5h; The quenched band was broken down to 10 μm.

[0019] 3) The magnetic powder prepared in step (1) (2) is uniformly mixed ...

Embodiment 2

[0027] 1) SmCo magnet preparation: by mass ratio Sm 25 co 47 tm 28 (TM=Fe, Cu, Ti, Cr) batching and induction smelting into ingots, then rolling ball milling into 2-5 μm magnetic powder, orientation forming into compacts, and sintering and solid solution treatment at 1210ºC+1170ºC for the compacts, the time is 8h, then aging treatment, first at 830ºC for 10h, then cooled to 400ºC for 10h and then quenched. Finally, a planetary ball mill was used to crush the magnet to 200 μm magnetic powder.

[0028] 2) Preparation of MnBi magnetic powder: according to the chemical formula Mn 23 Bi 72 TM5 (TM=Ti, Zr, Ni) was batched and melted into ingots by induction melting, and the MnBi quenching strip was prepared by the solution quenching method with a roll speed of 40m / s; then the MnBi quenching strip was subjected to aging treatment at 250ºC, and the aging time 0.5h; use the planetary ball milling process to crush the quenching zone to 30μm.

[0029] 3) The magnetic powder prepare...

Embodiment 3

[0037] 1) SmCo magnet preparation: according to the chemical formula Sm 30 co 57 tm 13 (TM=Cu, Fe, Zr, Ni) batching and induction melting into ingots, then rolling ball milling into 2-5μm magnetic powder, orientation molding into green compacts, sintering solid solution treatment at 1240ºC+1200ºC for 5 hours , and then aging treatment, first at 900ºC for 0.5h, then cooled to 400ºC for 20h and then quenched. Finally, a planetary ball mill was used to crush the magnet to 500 μm magnetic powder.

[0038] 2) Preparation of MnBi magnetic powder: according to the chemical formula Mn 25 Bi 65 tm 10 (TM=Cu, Ti, Ni) batching and induction melting into ingots, the MnBi quenching belt was prepared by the solution quenching method, the roll speed was 50m / s; then the MnBi quenching belt was subjected to aging treatment at 350ºC, and the aging time was 0.5h; use the planetary ball milling process to crush the quenching zone to 50μm.

[0039] 3) The magnetic powder prepared in step (1...

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Abstract

The invention belongs to the technical field of magnetic materials, and discloses a preparation method of an anisotropic SmCo / MnBi composite magnet. The preparation method comprises the following steps: 1) respectively preparing SmCo magnetic powders and MnBi magnetic powders; and 2) uniformly mixing the SmCo magnetic powders and the MnBi magnetic powders according to a certain ratio, carrying outoriented forming to prepare a compact, and carrying out low-temperature fast sintering on the compact through the high magnetic field assisted laser low-temperature sintering technology to prepare the anisotropic SmCo / MnBi composite magnet. The preparation method disclosed by the invention has the advantages that through the high magnetic field assisted laser low-temperature sintering technology,the technical bottleneck that the coercivity of a samarium-cobalt magnet is reduced during high-temperature densification is effectively solved, and a low-melting-point phase in a MnBi magnet is reasonably utilized, so that the density of the SmCo / MnBi composite magnet is improved, and residual magnetism in the magnet is optimized; and meanwhile, the rare earth content in the magnet is reduced, so that the cost is lowered.

Description

technical field [0001] The invention relates to the technical field of designing magnetic materials, in particular to a method for preparing an anisotropic SmCo / MnBi composite magnet. Background technique [0002] In recent years, due to the further development of science and technology, there is an urgent need for a permanent magnet that can still have high magnetic properties at high temperatures in aerospace, defense technology and other fields. Traditional SM 2 co 17 The intrinsic coercive force of the type permanent magnet decreases with the increase of temperature, and the Sm of the abnormal temperature coefficient 2 co 17 Type permanent magnet, within a certain temperature range, its intrinsic coercive force increases with the increase of temperature, but because of its low coercive force at room temperature (~0.1T), the intrinsic coercive force at high temperature is still relatively low. Low. In the MnBi alloy, as the temperature rises, the lattice parameters c...

Claims

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Application Information

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IPC IPC(8): H01F1/055H01F1/059H01F41/02
CPCH01F1/0557H01F1/059H01F41/0273
Inventor 吴琼俞能君葛洪良吉天驰李进婷
Owner CHINA JILIANG UNIV
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