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Samarium cobalt permanent magnetic material and preparation method thereof

A permanent magnet material, samarium cobalt technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of not meeting the requirements of use, low temperature coefficient of remanence, low coercive force of magnets, etc., to save raw material costs, The effect of high magnetic properties and uniform distribution of alloy elements

Inactive Publication Date: 2013-09-25
湖南航天有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the magnetic properties and temperature characteristics of existing permanent magnet materials, the use temperature of AlNiCo permanent magnet materials can reach 520 ° C, but the coercive force of the magnet is very low at this temperature (the intrinsic coercive force of the high coercive force brand magnet h cj only about 120kA / m), the maximum energy product is only 80kJ / m 3 Therefore, it cannot be used to manufacture small and light components and devices, and it is difficult to meet the actual application requirements; the NdFeB system sintered permanent magnet material with the highest magnetic energy product, due to the low Curie temperature, the maximum operating temperature is only 100 ° C, through The adjustment of the composition and the improvement of the manufacturing process, the maximum service temperature does not exceed 250 ℃, and cannot meet the service requirements; and Sm 2 co l7 Due to the high magnetic properties of permanent magnets, the Curie temperature is above 820°C, and the temperature coefficient of remanence is low, so Sm 2 co l7 Permanent magnets become the first choice for high temperature magnets

Method used

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  • Samarium cobalt permanent magnetic material and preparation method thereof
  • Samarium cobalt permanent magnetic material and preparation method thereof
  • Samarium cobalt permanent magnetic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Weigh raw materials: mix raw materials according to mass percentage: samarium 25.5%, cobalt 52%, iron 10.5%, copper 8%, zirconium 4%;

[0025] (2) Alloy smelting: Melt the prepared raw materials in an intermediate frequency induction furnace, then heat and refine them at a temperature of 1400°C to 1500°C for 10min to 15min, and then pour the molten samarium cobalt alloy liquid into a water-cooled copper mold for rapid cooling , to obtain a samarium-cobalt alloy ingot;

[0026] (3) Preparation of magnetic powder: coarsely crush the alloy ingot into 100 μm coarse particles with a vibration mill, and further crush the coarsely crushed magnetic powder into 3 μm to 5 μm with a planetary ball mill;

[0027] (4) Orientation forming: the magnetic powder is oriented and pressed under a magnetic field of 1.5T-2.0T, and then subjected to cold isostatic pressing under a pressure of 200Mpa-300Mpa to obtain a samarium-cobalt blank;

[0028] (5) Sintering and solid solution: In a...

Embodiment 2

[0034] Raw materials: samarium, cobalt, iron, copper, zirconium;

[0035] The above raw materials are batched according to mass percentage: 24.5% samarium, 54.5% cobalt, 12% iron, 6.5% copper, 2.5% zirconium;

[0036] The preparation method of samarium cobalt permanent magnet material of the present invention is the same as embodiment 1.

[0037] The magnetic properties of the samarium cobalt permanent magnet sample test prepared by the present embodiment are as shown in table 2:

[0038] Table 2

[0039]

Embodiment 3

[0041] Raw materials: samarium, cobalt, iron, copper, zirconium;

[0042]The above raw materials are batched according to mass percentage: samarium 25%, cobalt 56%, iron 7.5%, copper 8%, zirconium 3.5%;

[0043] The preparation method of samarium cobalt permanent magnet material of the present invention is the same as embodiment 1.

[0044] The magnetic properties of the samarium cobalt permanent magnet sample test prepared by the present embodiment are as shown in table 3:

[0045] table 3

[0046]

[0047] It can be seen from the samples prepared in the above examples that the samarium cobalt permanent magnet material of the present invention has high coercive force and low temperature coefficient while reducing the production cost, and the demagnetization curve at 400° C. to 450° C. is a straight line, satisfying High temperature use requirements.

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Abstract

The invention discloses a samarium cobalt permanent magnetic material and a preparation method thereof. The samarium cobalt permanent magnetic material is prepared from the following chemical ingredients by mass percent: 24.5-26% of samarium, 52-56% of cobalt, 7.5-12% of iron, 6.5-8% of copper, and 2-4% of zirconium. The samarium cobalt permanent magnet disclosed by the invention has high coercivity and low temperature coefficient; the magnetic performance at the temperature of 400-450 DEG C is that the residual magnetism Br is 0.783-0.907 T; the intrinsic coercivity Hcj is 704-1092.5 kA / m; the maximal magnetic level (BH)max is 108.5-164 kJ / m<3>; the temperature coefficient alpha of the residual magnetism is -0.0368% / DEG C to -0.054% / DEG C; and the temperature coefficient beta of the intrinsic coercivity is -0.132% / DEG C to -0.198% / DEG C. Thus, the samarium cobalt permanent magnetic material is simple in process and low in manufacturing cost.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, and specifically relates to a samarium cobalt permanent magnet material with high coercive force and low temperature coefficient and a working temperature of 400°C to 450°C and a preparation method thereof. Background technique [0002] With the development of science and technology, high-temperature magnets with a working temperature of 400°C to 500°C and magnets with low temperature coefficients have been proposed in the fields of national defense and military industry. For example, in the engine system of a new generation of aircraft, high temperatures with a working temperature greater than 400°C are required. Magnets, as well as electronic components that replace the original hydraulic transmission system, improve the reliability of the aircraft and reduce the maintenance difficulty of the aircraft. Among the magnetic properties and temperature characteristics o...

Claims

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Application Information

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IPC IPC(8): H01F1/053B22F3/16
Inventor 罗明谭春林李彬
Owner 湖南航天有限责任公司
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