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Method for preparing sintered samarium-cobalt magnet

A samarium-cobalt magnet and samarium-cobalt technology are applied in the direction of magnetic objects, magnetic materials, and inorganic materials, which can solve the problems of poor consistency of sintered samarium-cobalt magnets, incompatibility of preparation methods, and increased production costs of enterprises. High consistency, stable process effect

Active Publication Date: 2013-04-24
NINGBO YUNSHENG +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the preparation methods of various types of sintered samarium cobalt magnets are incompatible, the production cost of the enterprise is greatly increased, and the production capacity of vacuum induction melting furnaces is usually 20-30kg per furnace. For sintered samarium cobalt magnets, the demand is much greater than that of a single furnace. For magnets, enterprises cannot produce according to the "one-to-one correspondence" mode, which will inevitably lead to poor consistency of sintered samarium cobalt magnets

Method used

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  • Method for preparing sintered samarium-cobalt magnet
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  • Method for preparing sintered samarium-cobalt magnet

Examples

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Embodiment 1

[0025] Embodiment 1: a method for preparing a sintered samarium cobalt magnet, comprising the following steps:

[0026] ① Preparation of the first samarium-cobalt alloy A1 and the second samarium-cobalt alloy B1; the specific process is:

[0027] ①-1 Ingredients: The material ratio of the first samarium-cobalt alloy A1 is: Sm: 26.69% (weight percent), Zr: 2.26% (weight percent), Fe: 19.43% (weight percent), Cu: 4.74% (weight percent percentage) and Co: 46.88% (weight percentage); the material ratio of the second samarium-cobalt alloy B1 is: Sm: 23.88% (weight percentage), Zr: 3.48% (weight percentage), Fe: 10.65% (weight percentage) , Cu: 8.07% (weight percent) and Co: 53.92% (weight percent);

[0028] ①-2 Put the raw material of the first samarium-cobalt alloy A1 and the raw material of the second samarium-cobalt alloy B1 configured in step ①-1 into the vacuum induction melting furnace respectively, and start vacuuming;

[0029] ①-3 When the vacuum degree in the vacuum indu...

Embodiment 2

[0037] Embodiment 2: This embodiment is basically the same as Embodiment 1, the only difference is that in this embodiment, the first samarium-cobalt alloy primary crushing magnetic powder and the second samarium-cobalt alloy primary crushing magnetic powder are put into the ball mill tank according to the weight ratio of 9:11 ball milled.

Embodiment 3

[0038] Embodiment 3: This embodiment is basically the same as Embodiment 1, the only difference is that in this embodiment, the first samarium-cobalt alloy primary crushing magnetic powder and the second samarium-cobalt alloy primary crushing magnetic powder are put into the ball mill tank according to the weight ratio of 1:4 ball milled.

[0039] The sintered samarium cobalt magnets prepared by single alloy technology in the prior art and the sintered samarium cobalt magnets obtained in Examples 1 to 3 of the present invention were tested for relevant magnetic property parameters, and their magnetic properties are shown in Table 1.

[0040] Table 1

[0041]

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Abstract

The invention discloses a method for preparing a sintered samarium-cobalt magnet. The method comprises the following steps of: preparing a first samarium-cobalt alloy and a second samarium-cobalt alloy; performing primary crushing on the first samarium-cobalt alloy and the second samarium-cobalt alloy; mixing first samarium-cobalt alloy primarily crushed magnetic powder and second samarium-cobalt alloy primarily crushed magnetic powder, and performing fine crushing, so that primarily crushed mixed magnetic powder is refined, and components are homogenized; and performing magnetic field orientation forming, cold isostatic pressing, sintering, solid solution treatment and ageing treatment on samarium-cobalt magnetic powder obtained by fine crushing in sequence. The method has the advantages that the first samarium-cobalt alloy has high remanence component characteristic, the second samarium-cobalt alloy has high coercivity component characteristic, the sintered samarium-cobalt magnets with various magnetic properties can be obtained by adjusting the mixing ratio of the first samarium-cobalt alloy primarily crushed magnetic powder to the second samarium-cobalt alloy primarily crushed magnetic powder, and the process is stable and low in cost.

Description

technical field [0001] The invention relates to a method for preparing a samarium-cobalt magnet, in particular to a method for preparing a sintered samarium-cobalt magnet. Background technique [0002] As the third generation rare earth permanent magnet material, NdFeB permanent magnet material has high remanence B r , high coercive force H cj and high maximum energy product (BH) max And other characteristics, are widely used in nuclear magnetic resonance, computers, hybrid vehicles, various electric motors and wind generators and other fields. However, in recent years, the government has strengthened the supervision of rare earth resources, which has led to a sharp increase in the price of raw materials such as praseodymium, dysprosium and terbium for the production of NdFeB magnets. At the same time, the Curie temperature of NdFeB permanent magnet materials is low and corrosion resistance Poor performance limits the application of the third generation rare earth permane...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/053H01F1/08B22F3/16
Inventor 周晓庆张民沈国迪侯绍滕丁勇吕向科
Owner NINGBO YUNSHENG
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