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Low-coercive-force samarium-cobalt magnet and preparation method thereof

A samarium-cobalt magnet and chemical composition technology, applied in the direction of magnetic objects, inductors/transformers/magnets, magnetic materials, etc., can solve the problem of deteriorating samarium-cobalt magnet performance, reducing the coercive force of samarium-cobalt magnets, and low-coercive force samarium-cobalt magnets Magnets and other issues, to meet customer requirements, improve overall performance, and easily saturate the effect of magnetization work

Active Publication Date: 2016-02-24
CHENGDU GALAXY MAGNETAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem that the high-coercivity samarium-cobalt magnets in the prior art are not suitable for assembly first and then magnetized, and the addition of cerium will deteriorate the performance of the samarium-cobalt magnets, and provide a low-coercivity samarium-cobalt magnet , and a method for reducing the coercive force of a samarium cobalt magnet, or a method for preparing the above-mentioned low coercive force samarium cobalt magnet

Method used

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  • Low-coercive-force samarium-cobalt magnet and preparation method thereof
  • Low-coercive-force samarium-cobalt magnet and preparation method thereof
  • Low-coercive-force samarium-cobalt magnet and preparation method thereof

Examples

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Embodiment 1

[0040] 1) According to the mass percentage: (Sm1-z RE z ) a co (1-a-b-c-d) Cu b Fe d Zr c , the value of a is: 25% and 28%, the value of Z is 0, the content of copper is 8%, the content of zirconium is: 3%, the content of iron is: 15%, and the rest is cobalt to prepare low coercive force samarium Cobalt magnet raw materials are respectively named formula 1 (a=25%) and formula 2 (a=28%) according to the difference of a value.

[0041] 2) Melting the prepared raw materials in a vacuum or protective gas environment to make alloy ingots or slabs with a thickness of 0.2-0.5mm.

[0042] 3) Coarsely crushing the alloy ingots or flakes to produce particles with a size of less than 1mm, and then ball milling the powder into 4-7μm powders under protective gas.

[0043] 4) The powder is pressed into a powder in a magnetic field greater than 1.5T, and then isostatically pressed under a pressure of 250 MPa to form a green body.

[0044] 5) Put the green body into the sintering furna...

Embodiment 2

[0052] According to mass percentage: (Sm 1-z RE z ) a co (1-a-b-c-d) Cu b Fe d Zr c , the value of a is: 28%, the value of RE is Nd, the value of Z is 0% and 17.86%, the content of copper is 8%, the content of zirconium is: 3%, the content of iron is: 15%, and the rest is cobalt. Raw materials for low coercivity samarium cobalt magnets. The difference between Example 2 and Example 1 is that the composition and dosage of RE are different. The added Nd content is used as the difference point, and they are divided into two groups, which are recorded as formula 3 (adding 5% Nd: Z=17.86%, replacing with Nd The total amount is 5% Sm, the same below), formula 2 (not added). All the other preparation processes are the same as in Example 1.

[0053] The samarium-cobalt magnets prepared according to formula 3 and formula 2 in Example 2 were sampled and tested, and the magnetic properties of the products are shown in Table 2.

[0054] Table 2 Changes in magnetic properties after...

Embodiment 3

[0058] According to mass percentage: (Sm 1-z RE z ) a co (1-a-b-c-d) Cu b Fe d Zr c , the value of a is: 28%, RE is MM, and MM is mixed rare earth, which is the 194025A grade specified in GB / T4153-2008. The value of Z is 0% and 20%, the content of copper is 8%, the content of zirconium is 3%, the content of iron is 15%, the rest is cobalt, and the raw material of low coercivity samarium cobalt magnet is prepared. Taking the amount of MM added as a difference point, they were divided into two groups, which were recorded as formula 4 (add 20% MM, Z=20%, that is, replace 20% Sm with MM quality, the same below), and formula 2 (not added). The preparation process of the samarium cobalt magnet is the same as that in Example 1.

[0059] The corresponding samarium cobalt magnet samples were prepared by repeating the formula 4 and formula 2 for many times, and these samarium cobalt magnets were sampled and tested to test their intrinsic coercive force. The results are shown in T...

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Abstract

The invention discloses a low-coercive-force samarium-cobalt magnet and a preparation method thereof. The chemical component of the samarium-cobalt magnet is as follows: (Sm1-zREz)aCo(1-a-b-c-d)CubFedZrc, wherein RE is at least one of Nd, Gd and MM; a is equal to 25%-29%, b is equal to 6%-9%, c is equal to 2%-3% and d is equal to 13%-17%; and z is equal to 0-0.4. The samarium-cobalt magnet takes the samarium-cobalt magnet at the ratio of 2 to 17 as a basis; the element composition and the component ratio are finely adjusted so that the intrinsic coercive force Hcj of a samarium-cobalt magnet product is greatly reduced and the technical requirements that a magnetizing magnetic field is relatively low under special conditions and saturated magnetization is needed are met very well.

Description

technical field [0001] The invention relates to the field of rare earth permanent magnet materials, in particular to a low-coercivity samarium-cobalt magnet, and simultaneously the invention also relates to a preparation method of the samarium-cobalt magnet. Background technique [0002] The mass production process of high coercivity samarium cobalt magnets is relatively mature. Because the Hcj (intrinsic coercive force) always increases monotonously with the prolongation of the aging time at high temperature, by setting the aging time a little longer, Hcj can go up after all. However, the higher the intrinsic coercive force, the more stable the use, but the larger the magnetizing magnetic field must be. Some samarium cobalt magnets are often magnetized after assembly, limited by the equipment conditions of the assembly manufacturer or the limitation of product space, the magnetization magnetic field is relatively small, and the intrinsic coercive force is too high to ensur...

Claims

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Application Information

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IPC IPC(8): H01F1/055H01F41/02B22F3/02B22F3/10B22F3/24
CPCB22F3/02B22F3/10B22F2003/248H01F1/055H01F1/0551H01F41/0266
Inventor 王晓松朱玲旭冯进
Owner CHENGDU GALAXY MAGNETAB
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