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A method for preparing samarium cobalt permanent magnet

A permanent magnet, samarium cobalt technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of inability to take into account the working temperature and comprehensive magnetic performance, low remanence and maximum magnetic energy product, etc.

Inactive Publication Date: 2019-01-25
HUNAN AEROSPACE MAGNET & MAGNETO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The maximum working temperature of samarium cobalt permanent magnet materials can reach 300~500 ℃, but samarium cobalt permanent magnet materials have the disadvantages of low remanence and maximum energy product, especially the low temperature coefficient series of samarium cobalt permanent magnet materials, the remanence Br It is 0.9~1.02T (9~10.2kGs), and the maximum magnetic energy product (BH)max is 20~25MGOe. Although the working temperature is high, the comprehensive magnetic performance is sacrificed, and the working temperature and comprehensive magnetic performance cannot be considered.

Method used

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  • A method for preparing samarium cobalt permanent magnet

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Embodiment 1

[0046] This embodiment includes the following steps:

[0047] (1) Ingredients: weigh the raw materials samarium, cobalt, iron, copper, zirconium; mix the raw materials according to the following mass percentages: samarium 26.5%, cobalt 49.2%, iron 14.6%, copper 6.8%, zirconium 2.9%; the prepared The raw materials are smelted in an intermediate frequency induction furnace with a smelting frequency of 40Hz; then the frequency is lowered to 15Hz, kept at 1520°C for 5 minutes, and then poured into a cooling mold for rapid cooling to obtain a samarium-cobalt alloy ingot;

[0048] (2) Coarse crushing of alloy ingots: the samarium-cobalt alloy ingots obtained in step (1) are sequentially crushed by a jaw crusher and a secondary crusher into coarse particles with a particle size of 20-100 microns (μm) to obtain samarium cobalt alloy coarse particles;

[0049] (3) Jet mill powder: the coarse particles are further pulverized to 3-5 μm by jet mill to obtain jet mill magnetic powder;

...

Embodiment 2

[0055] The only difference between this embodiment and embodiment 1 is: in step (5), the sintering temperature is 1230°C. All the other are with embodiment 1.

[0056] The magnetic properties of the samarium cobalt permanent magnet samples prepared in this embodiment were tested, and the test results are shown in Table 1.

Embodiment 3

[0058] The only difference between this embodiment and embodiment 1 is: in step (5), the sintering temperature is 1240°C. All the other are with embodiment 1.

[0059] The magnetic properties of the samarium cobalt permanent magnet samples prepared in this embodiment were tested, and the test results are shown in Table 1.

[0060] Table 1

[0061]

[0062] From the comparison of the properties of the samples prepared in the above examples and the comparative examples, it can be seen that the samarium cobalt permanent magnet material prepared in the present invention has both high comprehensive magnetic properties and high working temperature, and can be applied to a high temperature environment of 400°C.

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Abstract

A method for preparing samarium cobalt permanent magnet comprises the following steps: (1) smelting the prepared raw materials containing samarium, cobalt, iron, copper and zirconium, refining at reduced frequency and heat preservation, and quenching to obtain samarium-cobalt alloy ingots; (2) coarsely crushing the samarium-cobalt alloy ingot into coarse particles with the particle size of 20 to 100 microns; 3) that coarse particle of the samarium-cobalt alloy are further crushed by a jet mill; 4) orient that jet mill powder unde a magnetic field, pressing and shaping, and cold isostatic pressing to obtain a samarium cobalt compact; 5) sequentially vacuum pre-sinter that samarium-cobalt blank, sintering by filling inert gas, cooling and solid solution, and air cooling to room temperature to obtain the sintered blank; 6) perform aging treatment to obtain a samarium cobalt permanent magnet. As that formula and the sinter process are adjust, the samarium-cobalt permanent magnet can overcome the shortcoming that the high comprehensive magnetic property and the high working temperature of the samarium-cobalt permanent magnet cannot be taken into account, and the samarium-cobalt permanent magnet with excellent comprehensive property and the high working temperature can be obtained.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular to a preparation method of a samarium cobalt permanent magnet. Background technique [0002] In recent years, sintered samarium cobalt permanent magnet materials have developed rapidly due to their high temperature resistance, and are widely used in motors, instruments, sensors, detectors, engines, radars and other high-tech fields. The method of industrial preparation of samarium-cobalt permanent magnet materials is mainly powder metallurgy. The general production process is: batching → smelting → powder making → molding → sintering → aging → magnetic testing → post-processing → surface treatment → inspection → finished product. [0003] The maximum working temperature of samarium cobalt permanent magnet materials can reach 300~500 ℃, but samarium cobalt permanent magnet materials have the disadvantages of low remanence and maximum energy product, espe...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/055
CPCH01F1/0556H01F1/0557H01F41/0266
Inventor 王琛刘超王玄罗明
Owner HUNAN AEROSPACE MAGNET & MAGNETO
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