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Samarium cobalt rare earth magnet and preparation method thereof

A rare-earth magnet, samarium-cobalt technology, applied in the direction of magnetic objects, inductors/transformers/magnets, magnetic materials, etc., can solve the problems of casting composition segregation, solidified structure with many impurities, uneven distribution of samarium content, etc.

Active Publication Date: 2021-09-14
福建省长汀卓尔科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems mentioned in the above-mentioned background technology, due to the segregation of casting components, uneven distribution of samarium content, and many impurity phases in solidified structure, the existing manufacturing process of samarium-cobalt rare earth magnet materials has low magnet remanence and poor squareness of demagnetization curves. To solve the problem, the present invention provides a method for preparing a samarium cobalt rare earth magnet, wherein the smelting process of the samarium cobalt rare earth magnet includes a first smelting stage, a second smelting stage and a third smelting stage,

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  • Samarium cobalt rare earth magnet and preparation method thereof

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Effect test

Embodiment 1

[0034] Embodiment 1 of the present invention also provides the following examples and comparative examples:

[0035] Wherein, embodiment and comparative example all adopt the magnet composition as shown in table 1:

[0036] Table 1

[0037] element Sm(at%) Co(at%) Fe(at%) Cu(at%) Zr(at%) Proportion 11.45 56.15 25.9 5 1.5

[0038] Embodiment and comparative example all adopt following preparation method, specifically comprise the following steps:

[0039] (1) Batching: batching is carried out according to the magnet composition in Table 1;

[0040] (2) Smelting and casting: the medium frequency induction melting method is adopted to successively go through the first melting stage, the second melting stage and the third melting stage to melt the metal material and cast the alloy ingot by rotating the cooling roller wall. The first melting stage Use an infrared thermometer to continuously monitor the temperature of the material in the crucible,...

Embodiment 2

[0069] Embodiment 2 of the present invention also provides the following examples and comparative examples:

[0070] Wherein, embodiment and comparative example all adopt the magnet composition as shown in table 8:

[0071] Table 8

[0072] element Sm(at%) Co(at%) Fe(at%) Cu(at%) Zr(at%) Proportion 11.6 53.5 28 5.5 1.4

[0073] Embodiment and comparative example all adopt following preparation method, specifically comprise the following steps:

[0074] (1) Batching: batching according to the magnet composition designed in Table 8;

[0075] (2) Smelting and casting: the method of intermediate frequency induction melting is adopted to go through the first melting stage, the second melting stage and the third melting stage in sequence to melt the metal material and cast the alloy ingot by rotating the cooling roller. In the first melting stage, Fill in Ar gas to keep the vacuum degree of the smelting chamber at 12kPa, use an infrared thermomete...

Embodiment 3

[0101] The third embodiment of the present invention also provides the following examples and comparative examples:

[0102] Wherein, embodiment and comparative example all adopt the magnet composition as shown in table 14:

[0103] Table 14

[0104] element Sm(at%) Co(at%) Fe(at%) Cu(at%) Ti(at%) Proportion 11.65 58.25 23.5 4.5 2.1

[0105] Adopt following preparation method, specifically comprise the following steps:

[0106] (1) Batching: batching according to the magnet composition in Table 14;

[0107] (2) Smelting and casting: the method of medium frequency induction melting is adopted to go through the first melting stage, the second melting stage and the third melting stage in turn to melt the metal material and cast the alloy ingot by rotating and cooling the ring wall. The first melting stage , filled with Ar gas to keep the vacuum degree of the smelting chamber at 12kPa, and continuously monitored the temperature of the material i...

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Abstract

The invention relates to the technical field of permanent magnet materials, in particular to a samarium cobalt rare earth magnet and a preparation method thereof. The smelting process in the preparation method of the samarium cobalt rare earth magnet comprises a first smelting stage, a second smelting stage and a third smelting stage, the vacuum degree of the first smelting stage is 10 kPa to 15 kPa, the smelting temperature is increased to T1 from a normal temperature, the T1 ranges from 1050 DEG C to 1100 DEG C; the vacuum degree of the second smelting stage ranges from 40 kPa to 50 kPa, the smelting temperature is increased to T3 from T2, the T2 ranges from 1050 DEG C to 1100 DEG C, and the T3 ranges from 1250 DEG C to 1350 DEG C; the vacuum degree of the third smelting stage ranges from 70 kPa to 90 kPa, the smelting temperature is increased to T5 from T4, the T4 ranges from 1250 DEG C to 1350 DEG C, and the T5 ranges from 1500 DEG C to 1600 DEG C. According to the samarium cobalt rare earth magnet and the preparation method thereof, the volatilization amount of samarium in the smelting process is reduced by adopting a segmented pressurization smelting mode, so that a high-performance samarium cobalt magnet is obtained.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to a samarium cobalt rare earth magnet and a preparation method thereof. Background technique [0002] Samarium cobalt magnet is a kind of rare earth magnet. It is a kind of magnetic functional material made of samarium, cobalt and other metal rare earth materials through proportioning, melting into alloy, crushing, pressing and sintering. Among them, high performance samarium Because of its excellent high-temperature magnetic properties, cobalt materials have important applications in military fields such as aerospace and civilian fields such as automobiles and high-speed rail drive motors. [0003] For example, the publication number is CN109859945A, the publication date is June 7, 2019, and the samarium cobalt permanent magnet material disclosed in the patent document titled "Preparation Method of High Temperature Samarium Cobalt Permanent Magnet Material" firs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22C1/02B22F3/16H01F1/055H01F41/02
CPCC22C19/07C22C1/02B22F3/16H01F1/0556H01F1/0557H01F41/0266
Inventor 吴茂林师大伟王国雄傅忠伟
Owner 福建省长汀卓尔科技股份有限公司
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