A submicron anisotropic samarium iron nitrogen magnet powder and a method for preparing a hybrid bonded magnet therefrom

An anisotropic, bonded magnet technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of SmFeN magnetic powder without emphasizing particle size characteristics, SmFeN anti-oxidation and anti-corrosion capabilities Strong, no problems such as the optimal proportioning method of samarium iron nitrogen weight ratio have been found, to achieve the effect of improving mechanical properties and corrosion resistance, strong oxidation resistance, and small particle size

Active Publication Date: 2017-01-11
NINGXIA MAGVALLEY NOVEL MATERIALS TECH CO LTD
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  • Abstract
  • Description
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  • 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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  • A submicron anisotropic samarium iron nitrogen magnet powder and a method for preparing a hybrid bonded magnet therefrom
  • A submicron anisotropic samarium iron nitrogen magnet powder and a method for preparing a hybrid bonded magnet therefrom
  • A submicron anisotropic samarium iron nitrogen magnet powder and a method for preparing a hybrid bonded magnet therefrom

Examples

Experimental program
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Effect test

Embodiment 1

[0067] Example 1 Preparation of anisotropic samarium-iron-nitrogen magnetic powder with submicron single crystal particles

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

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

[0070] The quick-setting flakes are placed in nitrogen for gas-solid phase reaction, the nitriding temperature is 500°C, and the reaction time is 6 hours. The X-ray diffraction comparison chart of the samarium iron quick-solidified flakes before and after nitriding is as follows figure 1 Shown. figure 1 It shows that after nitrogen absorption, s...

Embodiment 2

[0075] Example 2 Preparation of anisotropic samarium-iron-nitrogen magnetic powder with sub-micron single crystal particles

[0076] The composition of the master alloy is the same as in Example 1, but C is added 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 . The other process technology for manufacturing the magnetic powder is the same as in the first embodiment. When the interstitial atoms partially replace N with C, and the master alloy is added through the rapid-solidification flake technology, the Curie temperature and anisotropic field strength of the magnetic powder are significantly enhanced, as shown in Table 3. This is a powerful measure to improve the temperature performance of the magnetic powder.

[0077] table 3:

[0078] ingredient Tc(K) Ha(kOe) Example 1750120 Example 2780135

Embodiment 3

[0079] Example 3 Preparation of anisotropic samarium-iron-nitrogen magnetic powder with submicron single crystal particles

[0080] The composition of the master alloy is the same as in Example 1, but when the samarium-iron-nitrogen alloy is jet milled and / or ball milled, anisotropic samarium-iron-nitrogen single crystal particle magnetic powders with different average particle sizes can be obtained. The coercivity sensitivity depends on the magnetic powder. 的particle size.

[0081] Table 4:

[0082] The average particle size iHc(kOe) 3μm6.5 1.5μm9.5 1.0μm12.5 0.8μm14.0 0.6μm15.3 0.2μm 16.0

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Abstract

The invention provides a submicron anisotropic samarium iron nitrogen magnet powder and a method for preparing a hybrid bonded magnet therefrom. Samarium-iron alloy is prepared by using a quick setting sheet technology; the samarium-iron alloy is made to perform gas-solid phase reaction in nitrogen or mixed gas of nitrogen and hydrogen to form samarium-iron-nitrogen alloy; then airflow milling and / or ball milling is performed to obtain anisotropic samarium iron nitrogen single-crystal particle magnet powder with a particle size of 0.01-3 [mu]m. Further, the samarium iron nitrogen single-crystal particle magnet powder, as a first ingredient, is mixed with a second ingredient consisting of permanent magnetic ferrite, rapid quenching isotropic neodymium iron boron, anisotropic neodymium iron boron, samarium cobalt and / or neodymium iron nitrogen to form hybrid magnetic powder; processing agents are added; a hybrid bonded magnet is prepared by using a rolling, mould pressing, extrusion or injection method. The prepared samarium iron nitrogen magnet powder are high in magnetic energy product, residual magnetism and intrinsic coercive force, is low in cost and small in particle size; the corresponding hybrid bonded magnet exploits the advantages of different magnetic powder ingredients, is high in shaping degree and mechanical strength and is good in temperature performance.

Description

Technical field [0001] The invention belongs to the field of magnetic materials, and relates to a technology for manufacturing submicron single crystal particle anisotropic samarium-iron-nitrogen magnetic powder and a hybrid bonded magnet using it as one of the components. 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 increasingly miniaturized, lightweight, and high-performance electrical appliances and motors, the market demand for bonded magnets is increasing. [0003] The leading product in the current bonded magnet market is a bonded magnet with permanent ferrite or isotropic NdFeB magnetic powder as the main component. According to the different binders added, different manufacturing processes are adopted, mainly injection, Calendering, extrusion and molding methods. [0004] Magnets with permanent ferrite as the main componen...

Claims

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Application Information

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Patent Type & Authority Applications(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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