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Microwave aging treatment method for cobalt-based rare earth permanent magnetic materials

A rare earth permanent magnet and aging treatment technology, which is applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of discontinuous cell wall phase, poor uniformity of cell structure, and destruction of cell structure, and achieve uniform cell structure Effect

Active Publication Date: 2014-12-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, by adjusting the alloy composition (Sm, Fe, Cu, Zr) to refine the Sm 2 co 17 The grain size of the R phase is often accompanied by the destruction of the cellular structure and leads to a significant reduction in magnetic properties
For example, Matthias et al. increased the content of Sm from 10.3% to 11.6%, and the Sm of the alloy 2 co 17 The size of the R phase is refined from 160nm to 60nm, but the uniformity of the cell structure becomes poor, and the cell wall phase is discontinuous, which will inevitably lead to a decrease in magnetic properties
On the other hand, the cellular structure can also be refined by shortening the aging time, but the existing short-term aging will lead to incomplete cellular structure and greatly reduce the coercive force

Method used

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  • Microwave aging treatment method for cobalt-based rare earth permanent magnetic materials
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  • Microwave aging treatment method for cobalt-based rare earth permanent magnetic materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of samarium cobalt rare earth permanent magnet material sintered billet: put the raw materials weighed in advance according to the stoichiometric ratio into an intermediate frequency induction furnace for smelting, wherein the mass fraction of Sm is 24.0%, Fe is 18.0%, and Co is 52.5% %, Zr is 1.5%, and Cu is 4%. The smelted alloy ingot is roughly crushed and ball-milled into alloy powder with an average particle size of 3-5 μm. The powder is oriented in a magnetic field of 1.5T, and is formed by means of vertical magnetic field steel molding. The formed blanks were pressed by isostatic pressing at a pressure of 300 MPa. The compact was pre-sintered in vacuum at 1190°C for 30min, then high-purity argon was introduced and the temperature was raised to the sintering temperature of 1225°C and kept for 2h. The sintered samples were solution-treated at 1190 °C for 2 h and then air-cooled.

[0035] (2) Put the solution-treated sample into the heat insulatin...

Embodiment 2

[0039] (1) Preparation of samarium cobalt rare earth permanent magnet material sintered billet: put the raw materials weighed in advance according to the stoichiometric ratio into the intermediate frequency induction furnace for smelting, wherein the mass fraction of Sm is 26.0%, Fe is 8.0%, and Co is 50.5% %, Zr is 3.5%, and Cu is 12.0%. The smelted alloy ingot is roughly crushed and ball-milled into alloy powder with an average particle size of 3-5 μm. The powder is oriented in a magnetic field of 1.5T, and is formed by means of vertical magnetic field steel molding. The formed blanks were pressed by isostatic pressing at a pressure of 200 MPa. The compacts were pre-sintered in vacuum at 1180°C for 30min, and then passed in high-purity argon and heated to a sintering temperature of 1201°C and kept for 2h. The sintered samples were solution-treated at 1180 °C for 2 h and then air-cooled.

[0040] (2) Put the solution-treated sample into the heat insulating body in the micr...

Embodiment 3

[0044] (1) Preparation of samarium cobalt rare earth permanent magnet material sintered blank: put the raw materials weighed in advance according to the stoichiometric ratio into the intermediate frequency induction furnace for smelting, wherein the mass fraction of Sm is 25.5%, Fe is 16.0%, and Co is 48.2% %, Zr is 2.3%, and Cu is 8.0%. The smelted alloy ingot is roughly crushed and ball-milled into alloy powder with an average particle size of 3-5 μm. The powder is oriented in a magnetic field of 1.5T, and is formed by means of vertical magnetic field steel molding. The formed blanks were pressed isostatically at a pressure of 250 MPa. The compact was pre-sintered in vacuum at 1190°C for 30min, and then high-purity argon was introduced and heated to a sintering temperature of 1215°C and kept for 2h. The sintered samples were solution-treated at 1190 °C for 2 h and then air-cooled.

[0045] (2) Put the solution-treated sample into the heat insulating body in the microwave ...

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Abstract

The invention provides a microwave aging treatment method for cobalt-based rare earth permanent magnetic materials. Cobalt-based rare earth permanent magnetic material sintered blanks prepared by a powder metallurgy method are treated in a second-stage artificial aging or multi-stage artificial aging manner after the heating and the heat preservation in a microwave manner; by utilizing the high-frequency electromagnetic field of microwaves, on one hand, the electron spin magnetic moment orientation of 3d casing layers of transition metals in alloys is affected, the bonding energy between the transition metals and rare earth metals is weakened, the nucleation potential barriers of new Sm2Co17R phrases and SmCo5 phrases are reduced, nanocrystalline particles containing the Sm2Co17R phrases and the SmCo5 phrases are beneficial to form, and high saturation magnetization intensity and high mechanical property can be obtained; on the other hand, the microwaves can be converted into the diffused energy of atoms, the diffused speed of the atoms is increased, the sintering progress is accelerated, and the cell-shaped structures are refined. For the rare earth permanent magnetic materials treated by the method, the cell-shaped structures can be small and uniform. The method can be applied to prepare rare earth permanent magnetic materials which contain Sm (samarium), Co (cobalt), Fe (ferrum), Cu (copper), Zr (zirconium) or Ti (titanium) and have good mechanical property and high mechanical property, so that the method is suitable for industrialized application.

Description

Technical field: [0001] The invention relates to microwave aging treatment of samarium cobalt-based rare earth permanent magnet materials, in particular to Sm 2 Co 17 The invention relates to a microwave aging treatment method for a rare earth permanent magnet material, belonging to the technical field of heat treatment of a samarium cobalt-based rare earth permanent magnet material. Background technique: [0002] Samarium cobalt rare earth permanent magnet is an indispensable important functional metal material in aerospace, microwave communication, instrumentation, electrical engineering, magnetic machinery and other fields. It is characterized by high magnetic energy product, coercive force, high Curie temperature, good corrosion resistance, and can work stably for a long time in high temperature and humid environment. The magnetic energy product (BH) of samarium cobalt rare earth permanent magnet max Usually at 25-30MGOe. However, the mechanical properties of rare ear...

Claims

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Application Information

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IPC IPC(8): C22F1/10H01F1/053
Inventor 李丽娅易健宏彭元东
Owner CENT SOUTH UNIV
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