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A samarium cobalt sintered permanent magnet material and its preparation method

A permanent magnet, samarium cobalt technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problem of increasing equipment, energy consumption and production costs, easily destroying magnetic powder anisotropy and particle size distribution, affecting columnar crystal growth, etc. problem, to achieve the same and uniform grain size, improve various properties, and reduce the effect of element segregation

Active Publication Date: 2017-03-08
NINGBO NINGGANG PERMANENT MAGNETIC MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In order to improve the magnetic energy product and coercive force of samarium cobalt permanent magnets, heavy rare earth elements other than samarium elements are generally added to the composition of samarium cobalt permanent magnets, but the crystal shape, structure and particle size distribution of samarium cobalt permanent magnets also directly affect Performance parameters such as remanence, magnetic energy product and critical magnetic field, and the influence of the above magnetic properties include all aspects of the preparation process. growth
The process of preparing quick-setting sheets by the rapid quenching and quick-setting method of molten alloy is complicated, and must be ground in two stages, which is easy to destroy the anisotropy and particle size distribution of the magnetic powder
CN102651263A proposes to add the step of "hydrogenation and disproportionation of the alloy cast strip" before jet milling or ball milling to obtain 3-5 μm magnetic powder, although it also improves the anisotropy of the magnetic powder, but increases equipment, energy consumption and production costs

Method used

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  • A samarium cobalt sintered permanent magnet material and its preparation method
  • A samarium cobalt sintered permanent magnet material and its preparation method
  • A samarium cobalt sintered permanent magnet material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The raw materials were weighed according to the following weight fractions: samarium: 23.5%; cobalt: 51%; copper: 5%; zirconium: 3%; iron: 17.5%.

[0022] (1) Melting: Put the metal elements with the purity of Sm≥99.5%, Co≥99.6%, Cu≥99.7%, Zr≥99%, Fe≥99.8% in the crucible of the vacuum induction melting furnace, and evacuate to 5× 10 -2 Pa, filled with argon to 5×10 -2 Mpa, increase the power to gradually increase the melting temperature to 1500 ° C ~ 1600 ° C, refining under the protection of argon to obtain a uniform alloy melt;

[0023] (2) Ingot casting: After the smelting is complete, reduce the power of the smelting furnace, thereby reducing the temperature of the alloy solution to 1300-1400°C, and keep it for 2 minutes, then pour cooling water at 10°C-15°C into the cooling chamber of the ingot mold wall, Then the alloy melt is poured into an ingot cavity with a cavity thickness of 15 mm;

[0024] (3) Hydrogen absorption: 4.5 minutes after casting, at this time...

Embodiment 2

[0034] The raw materials were weighed according to the following weight fractions: samarium: 23.5%; cobalt: 51%; copper: 5.5%; zirconium: 3.2%; iron: 16.8%.

[0035] (1) Melting: Put the metal elements with the purity of Sm≥99.5%, Co≥99.6%, Cu≥99.7%, Zr≥99%, Fe≥99.8% in the crucible of the vacuum induction melting furnace, and evacuate to 5 ×10 -2 Pa, filled with argon to 5×10 -2 Mpa, increase the power to gradually increase the melting temperature to 1500 ° C ~ 1600 ° C, refining under the protection of argon to obtain a uniform alloy melt;

[0036] (2) Ingot casting: After the smelting is complete, reduce the temperature of the alloy solution in the melting furnace to 1300-1400°C and keep it for 2 minutes, then pour cooling water at 10°C-15°C into the cooling chamber of the ingot mold wall, and then put the alloy The melt is poured into an ingot cavity with a cavity thickness of 15 mm;

[0037] (3) Hydrogen absorption: 5 minutes after casting, at this time, the alloy temp...

Embodiment 3

[0047] The raw materials were weighed according to the following weight fractions: samarium: 23.5%; cobalt: 51%; copper: 5%; zirconium: 3.5%; iron: 17%.

[0048] (1) Melting: Put the metal elements with the purity of Sm≥99.5%, Co≥99.6%, Cu≥99.7%, Zr≥99%, Fe≥99.8% in the crucible of the vacuum induction melting furnace, and evacuate to 5× 10 -2 When it is below Pa, fill it with argon to 5×10 -2 Mpa, increase the power to gradually increase the melting temperature to 1500 ° C ~ 1600 ° C, refining under the protection of argon to obtain a uniform alloy melt;

[0049] (2) Ingot casting: After the smelting is complete, reduce the power of the smelting furnace, thereby reducing the temperature of the alloy solution to 1300-1400°C, and keep it for 2 minutes, then pour cooling water at 10°C-15°C into the cooling chamber of the ingot mold wall, Then the alloy melt is poured into an ingot cavity with a cavity thickness of 15mm;

[0050] (3) Hydrogen absorption: 4.5 minutes after cast...

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Abstract

A samarium and cobalt sintered permanent magnet material comprises, in weight percent, 25-27%wt of samarium, 49-51%wt of cobalt, 5-6.5%wt of copper, 3-3.5%wt of zirconium and 15-18%wt of iron. A preparation method includes the steps: smelting; casting an ingot; absorbing hydrogen for the cast ingot; making powder; performing orientation forming and sintering. In the smelting process, the thickness of a casting mould cavity is decreased, cooling water is filled into the wall of the mould cavity, cooling of the cast ingot is accelerated, element composition segregation is decreased, the production process is stabilized, a dendrite crystal is restrained by adding a zirconium element, hydrogen absorbing is performed for the cast ingot in the smelting process, production steps are saved, and energy consumption is reduced. In the subsequent milling process, the cast ingot absorbed hydrogen is crystallized into particles, the particles fracture along crystal boundaries in the milling process of airflow, the integrality of crystal particles is ensured, the anisotropy of the crystal particles is improved, magnetic powder particles are obtained, particle size distribution is concentrated with the range of 3.5-4.5 micrometers, the sintering temperature needed by the magnetic powder particle of each point of a blank is the same in the later sintering process, the sizes of the sintered crystal particles are the same and uniform, and the performances, particularly, such as residual magnetism Br, maximum magnetic energy product (BH) max and critical magnetic field Hk of a sintered permanent magnet are improved.

Description

technical field [0001] The invention relates to a samarium cobalt sintered permanent magnet material and a preparation method thereof. Background technique [0002] In order to improve the magnetic energy product and coercive force of samarium cobalt permanent magnets, heavy rare earth elements other than samarium elements are generally added to the composition of samarium cobalt permanent magnets, but the crystal shape, structure and particle size distribution of samarium cobalt permanent magnets also directly affect Performance parameters such as remanence, magnetic energy product and critical magnetic field, and the influence of the above magnetic properties include all aspects of the preparation process. growth. The process of preparing quick-setting sheets by the rapid quenching and quick-setting method of molten alloy is complicated, and it must be ground in two stages, which is easy to destroy the anisotropy and particle size distribution of the magnetic powder. CN1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/053H01F1/08C22C19/07C22C30/02B22D27/04B22F9/04B22F3/10
Inventor 周建斌董建宏
Owner NINGBO NINGGANG PERMANENT MAGNETIC MATERIALS
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