Method for preparing rare-earth permanent magnet powder

A rare earth permanent magnet and rare earth technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., to achieve the effect of eliminating the instability of the injection speed, suppressing the instability of the composition, and uniforming the injection speed

Inactive Publication Date: 2015-02-11
GRIREM ADVANCED MATERIALS CO LTD +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For TbCu 7 Nitride-type magnetic powder is generally prepared by rapid solidification. The preparation process generally includes steps such as rapid quenching, crystallization, and nitriding. The relationship between the speed of the quenching wheel and the speed of the quenching wheel is used to improve the preparation process so as to improve the preparation efficiency and magnetic properties of the material

Method used

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Effect test

Embodiment

[0031] The rare earth alloy is selected according to the composition ratio of the final rare earth permanent magnet powder to be obtained, and the alloy ingot is obtained by smelting. The ingot enters the melting chamber and undergoes induction smelting to obtain a molten alloy solution. The protective atmosphere is Ar, and the molten alloy solution enters through the nozzle. Quick quenching chamber.

[0032] The rapid quenching roller adopts Mo wheel, the protective atmosphere of the whole environment is Ar+He, where the volume percentage of He is η (%), the pressure difference formed by the melting chamber and the rapid quenching chamber is ΔP, and the cross-sectional area of ​​the nozzle is Φ, the speed of the quenching roller is V, and the relationship between the three is A=ΔP×Φ / V, where the unit of ΔP is kPa and the unit of Φ is mm 2 , The unit of V is m / s. A is in the range of 0.3 to 0.8, and rare earth alloy powder is obtained after rapid quenching.

[0033] The rare earth...

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Abstract

The invention provides a method for preparing rare-earth permanent magnet powder. The method includes that (1) rare earth alloy is melted at high temperature to obtain a melted rare earth alloy steel liquid; (2) the melted rare earth alloy steel liquid is sprayed through a spray nozzle to contact with a rotating water cooling roller for rapid quenching to obtain rare earth alloy powder; (3) the rare earth alloy powder is subjected to thermal treatment at the temperature of 650 DEG C to 850 DEG C; (4) the rare earth alloy powder after the thermal treatment is subjected to nitrogen treatment. Melting of the rare earth alloy and rapid quenching of the rare earth alloy steel liquid are performed in a melting chamber and a rapid quenching chamber respectively, the melting chamber and the rapid quenching chamber are connected through the spray nozzle, and environmental atmosphere of the rapid quenching chamber is mixed gas of argon and helium. By means of the method for preparing the rare-earth permanent magnet powder, performances of prepared materials can be effectively guaranteed, magnetic performances of the materials can be improved, and the rare-earth permanent magnet powder prepared by the method can be mixed with bonder for bonding to prepare a bonded magnet which is applied to a motor, a loudspeaker and a measuring instrument.

Description

Technical field [0001] The invention relates to a method for preparing rare earth permanent magnetic powder, and belongs to the technical field of rare earth magnetic materials. Background technique [0002] Bonded rare earth permanent magnet is a combination of rare earth permanent magnet powder and bonding material, which can be directly injected or molded into various permanent magnet devices as required. This type of magnet has the advantages of high dimensional accuracy, good magnetic uniformity, good corrosion resistance, high yield, and easy processing into complex shape devices. It is widely used in home appliances, micromotors, automated office equipment, instrumentation, medical devices, Cars, magnetic machinery and other devices and equipment. [0003] The key to the preparation of bonded rare-earth permanent magnets is the preparation of rare-earth permanent magnet powder. The performance of the magnetic powder directly determines the quality and market price of the bo...

Claims

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Application Information

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IPC IPC(8): H01F1/053H01F1/08B22F1/00
Inventor 李红卫罗阳于敦波李扩社闫文龙靳金玲谢佳君杨远飞张洪滨
Owner GRIREM ADVANCED MATERIALS CO LTD
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