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Preparation method of submicron anisotropic samarium iron nitrogen magnetic powder and hybrid bonded magnet thereof

An anisotropic, bonded magnet technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of not finding the best ratio method of samarium-iron-nitrogen weight ratio, samarium-iron-nitrogen anti-oxidation, Strong corrosion resistance, SmFeN magnetic powder does not emphasize the particle size characteristics, etc., to achieve the effect of improving mechanical properties and corrosion resistance, strong oxidation resistance, and small particle size

Active Publication Date: 2021-04-13
NINGXIA MAGVALLEY NOVEL MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In addition, in the existing manufacturing method of composite magnets with SmFeN as one of the components, the selected SmFeN magnetic powder does not emphasize its particle size characteristics, and the optimal ratio of SmFeN weight ratio to magnet performance has not been found. method, which does not reflect the characteristics of strong anti-oxidation and corrosion resistance of samarium iron nitrogen in the manufacturing process, and further research is needed

Method used

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  • Preparation method of submicron anisotropic samarium iron nitrogen magnetic powder and hybrid bonded magnet thereof
  • Preparation method of submicron anisotropic samarium iron nitrogen magnetic powder and hybrid bonded magnet thereof
  • Preparation method of submicron anisotropic samarium iron nitrogen magnetic powder and hybrid bonded magnet thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Example 1 Preparation of anisotropic SmFeN magnetic powder with submicron-sized single crystal particles

[0068] Mix other raw material components except nitrogen, which contains rare earth elements Sm, Nd, Ce, and iron Fe, Co, Nb, and the atomic percentage of the mixture is Sm 8.5 Nd 1.5 Ce 1.0 Fe 76 co 8 Nb 5 .

[0069] A samarium-iron alloy with good single-phase properties was prepared by custom-made equipment and quick-setting thin-section technology. The speed of the quick-setting rotor is 1-4 meters per second, and a thin slice with a thickness of 0.1-0.5 mm and a width of 1-5 mm is obtained. No annealing treatment is required.

[0070] The above-mentioned quick-setting flakes were placed in nitrogen to carry out gas-solid phase reaction, the nitriding temperature was 500°C, and the reaction time was 6 hours. Comparison of X-ray diffraction images of samarium-iron quick-setting thin slices before and after nitriding figure 1 shown. figure 1 It shows ...

Embodiment 2

[0075] Example 2 Preparation of anisotropic SmFeN magnetic powder with submicron-sized single crystal particles

[0076] The composition of master alloy is identical with embodiment 1, but adds C on this basis 5 , that is, the atomic percentage is Sm 8.5 Nd 1.5 Ce 1.0 Fe 76 co 8 Nb 5 C 5. Other techniques for producing magnetic powder are the same as in Example 1. When interstitial atoms replace N with C part and add master alloy through quick-setting flake technology, the Curie temperature and anisotropic field strength of magnetic powder are significantly enhanced, as shown in Table 3, which is a powerful measure to improve the temperature performance of magnetic powder.

[0077] table 3:

[0078] Element Tc(K) Ha(kOe) Example 1 750 120 Example 2 780 135

Embodiment 3

[0079] Example 3 Preparation of anisotropic SmFeN magnetic powder with submicron-sized single crystal particles

[0080] The composition of the master alloy is the same as that in Example 1, but after jet milling and / or ball milling the SmFeN alloy, anisotropic SmFeN single crystal magnetic powders with different average particle sizes can be obtained, and the coercive force is sensitively dependent on the magnetic powder particle size.

[0081] Table 4:

[0082] The average particle size iHc(kOe) 3μm 6.5 1.5μm 9.5 1.0μm 12.5 0.8μm 14.0 0.6μm 15.3 0.2μm 16.0

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Abstract

The invention discloses a preparation method of submicron anisotropic samarium-iron-nitrogen magnetic powder and a hybrid bonded magnet thereof. Prepare samarium-iron alloys by quick-setting flake technology, and make them undergo gas-solid phase reaction in nitrogen or a mixed gas of nitrogen and hydrogen to form samarium-iron-nitrogen alloys, followed by jet milling and / or ball milling to obtain particle sizes between 0.01 and 3 μm Anisotropic SmFeN single crystal particle magnetic powder. Further, SmFeN single crystal particle magnetic powder is used as the first component and the second component composed of permanent magnet ferrite, rapidly quenched isotropic NdFeB, anisotropic NdFeB, SmCo and / or NdFeN The two components are mixed into hybrid magnetic powder, and the hybrid bonded magnet is prepared by calendering, molding, extrusion or injection after adding processing aids. The samarium-iron-nitrogen magnetic powder prepared by the present invention has high magnetic energy product, residual magnetism and intrinsic coercive force, low cost, small particle size, and the corresponding hybrid bonded magnet can play the advantages of different component magnetic powders, and has high forming degree and mechanical strength. , and good temperature performance.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and relates to a technology for manufacturing anisotropic samarium-iron-nitrogen magnetic powder with submicron single crystal particles and a hybrid bonded magnet using it as a component. Background technique [0002] The field of magnetic materials includes sintered magnets and bonded magnets. With the continuous development of the consumer electronics field, especially the trend of miniaturization, light weight and high performance of electrical appliances and motors, the market demand for bonded magnets is increasing. [0003] The leading products in the current bonded magnet market are bonded magnets with permanent magnet ferrite or isotropic NdFeB magnetic powder as the main component, and different manufacturing processes are adopted according to the different binders added, mainly for injection, Calendering, extrusion and molding methods. [0004] The magnet with permanent ferrite as t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04H01F1/053H01F41/02
Inventor 程本培陈海英王心安
Owner NINGXIA MAGVALLEY NOVEL MATERIALS TECH CO LTD
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