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Method for improving magnetic performance of samarium-cobalt permanent magnet material

A technology of permanent magnetic materials and magnetic properties, which is applied in the manufacture of magnetic materials, magnetic objects, inductors/transformers/magnets, etc. Magnetic energy product and other issues, to achieve the effect of regulating and optimizing element distribution, ensuring diffusion temperature, and improving production efficiency

Active Publication Date: 2020-12-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the cellular structure of samarium-cobalt permanent magnet materials with high saturation magnetization is difficult to form uniformly, and there is no complete cellular structure near the grain boundary. The defects of the cellular structure make the pinning field of the magnetic domain wall weak, and it is difficult to obtain High coercive force, which seriously hinders the application of magnets
A large number of research and analysis have found that the formation of cellular structure of samarium-cobalt permanent magnet materials with high saturation magnetization is extremely sensitive to the composition fluctuation of the magnet. Traditional alloy melting, double alloy and other processes cannot achieve fine composition control, and it is difficult to obtain high correction. Coercivity and Magnetic Properties
In the patent CN102568807A, the double alloy method is used to mix copper powder and samarium cobalt jet mill powder evenly, and then sintering solid solution and aging treatment can significantly improve the coercive force of the magnet, but the addition of a large amount of non-magnetic copper elements significantly reduces the magnet's coercive force. Remanence and magnetic energy product cannot be used in the preparation of high-performance samarium-cobalt magnets, and conventional solid solution and aging heat treatment control processes have limited improvement in the magnetic properties of samarium-cobalt magnets. Therefore, a simple and efficient samarium-cobalt permanent magnet material with magnetic properties has been developed. It is particularly important to improve the method

Method used

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preparation example Construction

[0032] In some more specific embodiments, the preparation method includes:

[0033] Put the base material with the low melting point phase diffusion source in a vacuum of 1×10 -1 ~1×10 -5 The thermal diffusion treatment is carried out under the condition of Pa.

[0034] Further, the preparation method includes: under an inert atmosphere with a pressure of 0.02-0.15 MPa, performing thermal diffusion treatment on the base material applied with a low melting point phase diffusion source, or performing a thermal diffusion treatment on the base material applied with a low melting point phase diffusion source A pressure of 5-20N is applied and thermal diffusion treatment is performed.

[0035] Further, the thermal diffusion treatment includes: under vacuum or pressurized conditions, the temperature is raised to 350-450°C at a rate of 5-7°C / min, heat preservation treatment is performed for 1.5-2.5h, and then the temperature is increased at a rate of 5-7°C / min Cool down to 750-850°...

Embodiment 1

[0056] Diffusion treatment under vacuum conditions:

[0057] (1) Select 4μm rare earth-transition alloy Sm 0.3 Cu 0.7 (melting point at 600°C) low melting point powder as low melting point phase diffusion source, weigh 10g of alloy powder and alcohol in a mass ratio of 3:1 and mix thoroughly to form a suspension, wherein the viscosity of the suspension is 50-700mPa.s ;

[0058] (2) The samarium cobalt green body Sm(Co 0.7 Fe 0.05 Cu 0.05 Zr 0.05 ) 7 Processed into 20mm × 20mm × 1mm matrix sheet (i.e. powder oriented green body) after isostatic pressing, coated with a 0.4mm thick diffusion source on the surface layer of the matrix sheet, after that in 3 × 10 -2 Dry at 50°C for 30 minutes under a vacuum environment of Pa, and then put it into a high vacuum sintering furnace;

[0059] (3) Vacuumize the sintering furnace, when the vacuum degree reaches the required set value of 4×10 -3 Start heating at Pa, heat up to 400°C at a rate of 6°C / min, heat preservation treatment...

Embodiment 2

[0063] The preparation method of Example 2 is basically the same as that of Example 1, except that the low melting point phase diffusion source in step (1) of Example 1 is changed to Pr with an average particle size of 4 μm 0.3 Cu 0.7 Low melting point alloy powder (different from Sm in example 1 0.3 Cu 0.7 ), and its alloy melting point is 710°C.

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Abstract

The invention discloses a method for improving the magnetic performance of a samarium-cobalt permanent magnet material. The method comprises the steps: providing a samarium-cobalt permanent magnet asa base material, and the chemical formula of the base material as a powder orientation forming green body being Sm(CoxFeyCuzZrm)n, wherein x is larger than 0.5 and smaller than 0.9, y is larger than 0.01 and smaller than 0.1, z is larger than 0.01 and smaller than 0.1, m is larger than 0.01 and smaller than 0.1, and n is larger than 6 and smaller than 9; applying a low-melting-point phase diffusion source to the surface of the base material in a coating and / or cladding manner, and then performing vacuum and / or pressurized thermal diffusion treatment on the obtained base material; and carryingout sintering densification and aging treatment on the base material subjected to thermal diffusion treatment to prepare the samarium-cobalt permanent magnet material. According to the method providedby the invention, the magnetic performance of the samarium-cobalt permanent magnet material is effectively improved, and the application field of the samarium-cobalt rare earth permanent magnet material is expanded.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet materials, and in particular relates to a method for improving the magnetic properties of samarium cobalt permanent magnet materials. Background technique [0002] 2:17 SmCo permanent magnet materials are widely used in aerospace, high-speed motors, military products and other fields due to their excellent heat resistance, oxidation resistance and high Curie temperature (>800 °C). Compared with permanent magnet materials such as NdFeB and AlNiCo, 2:17 SmCo rare earth permanent magnets play an irreplaceable role in high temperature and high stability applications. [0003] The microstructure of 2:17 SmCo magnet consists of 2:17R intracellular phase with rhombohedral structure, cell wall phase with hexagonal structure and Zr-rich flake phase. Studies have shown that the cellular structure of samarium-cobalt permanent magnet materials with high saturation magnetization is difficult to fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/055
CPCH01F41/0293H01F1/0557
Inventor 杨棋棋刘壮陈仁杰张超越王广庆闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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