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Multi-layer composite magnet and preparation method thereof

A multi-layer composite, magnet technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem that the single-phase permanent magnet preparation process cannot be completely matched, cannot meet the use requirements in high temperature fields, and is prone to mutual diffusion and other problems, to achieve the effect of simple and feasible preparation method, low cost, and improved coercivity

Active Publication Date: 2016-03-02
NINGBO STAR MATERIALS HI TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this hot pressing method has two technical difficulties: first, the preparation process of the two single-phase permanent magnets cannot be completely matched; Anisotropic products, such as Sm 2 Fe 14 B and NdCo 5 , will greatly reduce the coercive force, which cannot meet the requirements for the use of magnets in high temperature fields

Method used

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  • Multi-layer composite magnet and preparation method thereof
  • Multi-layer composite magnet and preparation method thereof
  • Multi-layer composite magnet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] According to the composition and mass percentage of the NdFeB magnet as follows, the composition and mass percentage of the NdFeB magnet are: Nd: 27.00%, B: 2.20%, Si: 1.00%, Ga: 0.18%, Dy: 0.25% , V: 0.25%, the balance is Fe;

[0037] The NdFeB magnet blank was obtained by smelting, ingot casting, hydrogen crushing, jet milling, and compression molding of the ingredients. The NdFeB magnet blank was sintered at 1210°C for 0.6 hours, then dissolved in solid solution at 1170°C for 2 hours, and quickly air-cooled to room temperature to obtain For sintered compact, heat the sintered compact from room temperature to 815°C for 14 hours at a heating rate of 25°C / min, then cool slowly to 405°C at a cooling rate of 2°C / min, and hold for 3 hours to obtain a central layer NdFeB magnet ;

[0038] The middle layer of α-Fe and the outer layer of SmCo were sequentially deposited on the two sides of the central layer NdFeB magnet. 5 , the formed sandwich structure is the multilayer c...

Embodiment 2

[0040] According to the composition and mass percentage of the NdFeB magnet as follows, the composition and mass percentage of the NdFeB magnet are: Nd: 26.00%, B: 2.50%, Si: 0.80%, Ga: 0.20%, Dy: 0.10% , V: 0.30%, the balance is Fe;

[0041] The NdFeB magnet blank was obtained by smelting, ingot casting, hydrogen crushing, jet milling, and compression molding of the ingredients. The NdFeB magnet blank was sintered at 1220°C for 0.3 hours, then dissolved in solid solution at 1180°C for 2 hours, and quickly air-cooled to room temperature to obtain For sintered compact, heat the sintered compact from room temperature to 820°C for 12 hours at a heating rate of 30°C / min, then cool slowly to 420°C at a cooling rate of 3°C / min, and hold for 2 hours to obtain a central layer NdFeB magnet ;

[0042] The middle layer of α-Fe and the outer layer of SmCo were sequentially deposited on the two sides of the central layer NdFeB magnet. 5 , the formed sandwich structure is the multilayer c...

Embodiment 3

[0044] According to the composition and mass percentage of the NdFeB magnet as follows, the composition and mass percentage of the NdFeB magnet are: Nd: 28.00%, B: 1.80%, Si: 1.20%, Ga: 0.15%, Dy: 0.30% , V: 0.20%, the balance is Fe;

[0045] The NdFeB magnet blank was obtained by smelting, ingot casting, hydrogen crushing, jet milling, and compression molding of the ingredients. The NdFeB magnet blank was sintered at 1200°C for 0.4 hours, then dissolved in solid solution at 1160°C for 2.5 hours, and quickly air-cooled to room temperature to obtain For sintered compact, heat the sintered compact from room temperature to 810°C for 13 hours at a heating rate of 20°C / min, then cool slowly to 410°C at a cooling rate of 2°C / min, and hold for 2.5 hours to obtain a central layer NdFeB magnet ;

[0046] On the surface of both sides of the central NdFeB magnet, the Cu intercalation layer, the middle layer α-Fe, the Cu intercalation layer, and the outer layer of SmCo were sequentially ...

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Abstract

The invention relates to a multi-layer composite magnet, and belongs to the technical field of magnetic materials. The multi-layer composite magnet comprises a center layer composed of an NdFeB magnet; middle layers composed of alpha-Fe are arranged on two sides of the center layer respectively; outer layers composed of SmCo5 are arranged on the outer sides of the two middle layers respectively; a sandwich structure of CmCo5, alpha-Fe, NdFeB, alpha-Fe and SmCo5 in sequence is formed; and the mass percentages in the multi-layer composite magnet of the outer layer SmCo5, the middle layer alpha-Fe, the center layer NdFeB magnet, the middle layer alpha-Fe and the outer layer SmCo5 in the sandwich structure are 10% to 30%, 10% to 20%, 30% to 50%, 10% to 20% and 10% to 30% respectively. According to the multi-layer composite magnet disclosed by the invention, the NdFeB magnet with reasonable compatibility is taken as the center layer of a hard magnetic phase, the middle layers of soft magnetic phase alpha-Fe are additionally arranged on two sides of the center layer, the hard magnetic phase SmCo5 is additionally arranged on the outer side of the alpha-Fe, and a Cu penetrating layer is arranged between the hard magnetic phase and each soft magnetic phase, so that the magnetic performance of the magnet is further improved through the structural levels of the magnet and a reasonable manufacturing method, particularly the coercive force of the magnet is improved, and the production cost is also reduced.

Description

technical field [0001] The invention relates to a multilayer composite magnet and a preparation method thereof, belonging to the technical field of magnetic materials. Background technique [0002] Sintered NdFeB rare earth permanent magnet is the most magnetic permanent magnet material so far. It is widely used in many fields such as electronics, electromechanical, instrumentation and medical treatment. It is the fastest growing permanent magnet material with the best market prospect in the world today. The NdFeB type magnet has high saturation magnetization, low thermal stability (low coercive force at high temperature), and its Curie temperature is about 580K, which limits its application at high temperature. With the rapid development of electric vehicles and hybrid vehicles, the working temperature of permanent magnets is required to be above 200°C. Therefore, higher requirements are put forward for the high-temperature magnetic properties of NdFeB magnets. [0003] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F7/02H01F41/02C22C38/12
Inventor 潘道良苏广春关井和胡剑
Owner NINGBO STAR MATERIALS HI TECH
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