Method for preparing rare-earth permanent magnet powder

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...

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