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Preparation method of anisotropic samarium-cobalt magnetic powder

An anisotropic, samarium cobalt technology, applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve the problems of samarium cobalt particles cracking without breaking, difficulty in hydrogen absorption, and low hydrogen absorption characteristics of samarium cobalt , to achieve the effect of uniform hydrogen absorption and high degree of orientation

Active Publication Date: 2021-03-05
杭州智宇磁业科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Publication No. 105304249A, Publication No. 105489331A, and Publication No. 106531383A use the hydrogen breaking process to prepare sintered samarium cobalt magnets, but the hydrogen absorption characteristics of samarium cobalt are much lower than that of neodymium iron boron
Only some characteristic components of samarium cobalt are easily damaged by hydrogen absorption, such as formulas with high iron content and high rare earth content, but it is still very difficult for samarium cobalt materials with general formulas (lower iron content and less rare earth content) to absorb hydrogen
In addition, even if the ingot or slab of samarium cobalt is conducive to hydrogen absorption and fragmentation due to the existence of 1:5 phase, 2:7 phase and 1:3 phase which are easy to absorb hydrogen, if samarium cobalt is sintered, solid solution and After aging, the 1:5 phase, 2:7 phase and 1:3 phase that are easy to absorb hydrogen almost completely disappear. At this time, it is more difficult to absorb hydrogen. Insufficient hydrogen absorption will cause the samarium cobalt particles to crack but not broken. At this time, it is necessary to use Other external forces to help break

Method used

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  • Preparation method of anisotropic samarium-cobalt magnetic powder
  • Preparation method of anisotropic samarium-cobalt magnetic powder

Examples

Experimental program
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Effect test

Embodiment 1

[0058] The preparation method of anisotropic samarium cobalt magnetic powder in this embodiment is as follows:

[0059] (1) Melting and casting: The samarium-cobalt cast sheet is made by the quick-setting process, and the molecular formula of the samarium-cobalt alloy is Sm(Co bal Fe 0.25 Cu 0.06 Zr 0.02 Si 0.01 Ti 0.01 ) 7.8 , the quick-setting process adopts a copper roller cooling process, the linear speed of the copper roller is 0.5m / s, and the thickness of the samarium cobalt cast sheet is 0.8mm;

[0060] (2) Aging treatment: Place the samarium-cobalt cast piece in an inert gas environment, keep it at 830°C for 20h, then cool slowly to 400°C at a rate of 0.7°C / min and hold it for 5h, and finally at a rate of 50°C / min Cool to room temperature;

[0061] (3) Powder making: first place the samarium cobalt cast piece in a hydrogen absorbing device with a capacity of 300kg, put small steel balls with a weight of 100g / piece in the hydrogen absorbing device, the total weig...

Embodiment 2

[0063] The preparation method of anisotropic samarium cobalt magnetic powder in this embodiment is as follows:

[0064] (1) Melting and casting: The samarium-cobalt cast sheet is made by the quick-setting process, and the molecular formula of the samarium-cobalt alloy is Sm(Co bal Fe 0.20 mn 0.05 Cu 0.06 Zr 0.02 Ga 0.01 f 0.01 ) 7.4 , the quick-setting process adopts a copper roller cooling process, the linear speed of the copper roller is 0.5m / s, and the thickness of the samarium cobalt cast sheet is 0.8mm;

[0065] (2) Aging treatment: Place the samarium cobalt cast piece in an inert gas environment, keep it at 830°C for 25h, then slowly cool it to 400°C at a rate of 0.5°C / min and hold it for 5h, and finally at a rate of 50°C / min Cool to room temperature;

[0066] (3) Powder making: first place the samarium cobalt cast piece in a hydrogen absorbing device with a capacity of 300kg, put small steel balls with a weight of 100g / piece in the hydrogen absorbing device, the...

Embodiment 3

[0068] The preparation method of anisotropic samarium cobalt magnetic powder in this embodiment is as follows:

[0069] (1) Melting and casting: the samarium-cobalt cast sheet is made by the quick-setting process, and the molecular formula of the samarium-cobalt alloy is (Sm 0.8 Ce 0.2 )(Co bal Fe 0.22 Cu 0.06 Zr 0.02 V 0.01 f 0.01 ) 7.5 , the quick-setting process adopts a copper roller cooling process, the linear speed of the copper roller is 0.5m / s, and the thickness of the samarium cobalt cast sheet is 0.8mm;

[0070] (2) Aging treatment: place the samarium-cobalt cast piece in an inert gas environment, keep it at 830°C for 20h, then cool slowly to 400°C at a rate of 0.5°C / min and hold it for 5h, and finally at a rate of 50°C / min Cool to room temperature;

[0071] (3) Powder making: first place the samarium cobalt cast piece in a hydrogen absorbing device with a capacity of 300kg, put small steel balls with a weight of 200g / piece in the hydrogen absorbing device, ...

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Abstract

The invention relates to a preparation method of anisotropic samarium-cobalt magnetic powder, and belongs to the technical field of bonded magnet materials. The method comprises the following steps: (1) casting: preparing samarium-cobalt alloy into a samarium-cobalt casting piece through a rapid hardening process, wherein the samarium-cobalt alloy is 2: 17 type samarium-cobalt alloy, the components of the samarium-cobalt alloy contain T2 element, and the T2 element is one or more of Si, Hf, Ti, V and Ga; (2) aging treatment: carrying out aging treatment on the samarium-cobalt cast sheet; (3) powder preparation: preparing the samarium-cobalt cast sheet subjected to aging treatment into magnetic powder. The preparation method is simple in preparation process, uniform in powder and convenientfor large-scale preparation.

Description

technical field [0001] The invention relates to a preparation method of anisotropic samarium cobalt magnetic powder, belonging to the technical field of bonded magnet materials. Background technique [0002] Bonded rare-earth permanent magnet material is a new type of composite functional material, which refers to a magnet made of rare-earth permanent magnet powder and a certain proportion of binder according to a certain processing technology. The preparation process generally includes three processes of magnetic powder preparation, powder granulation and molding. Powder granulation refers to the process of mixing magnetic powder and binder with each other in a certain proportion to obtain mixed powder. The final size and shape of the bonded magnet is obtained at a certain temperature under a magnetic field or without a magnetic field. According to the final shape of bonded magnets, it can be divided into rigid rare earth bonded magnets and flexible rare earth bonded magne...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/055
CPCH01F41/0253H01F41/0273H01F41/0266H01F1/0553
Inventor 卜海飞楼思浩
Owner 杭州智宇磁业科技有限公司
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