A method for optimizing microstructure of neodymium-iron-boron magnet rapid solidified flakes using ultrasound

By simulating the resonant state and treating the copper roller with ultrasound, the problem of coarse dendritic crystals and uneven distribution of the second phase in the rapid solidification sheet was solved, the columnar crystals were refined and well-oriented, and the magnetic properties of the NdFeB magnet were improved.

CN122500179BActive Publication Date: 2026-09-04NORTHWESTERN POLYTECHNICAL UNIV +1
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Patent Information

Application Number
CN202610991968.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-07-06
Publication Date
2026-09-04
Estimated Expiration
2046-07-06

AI Technical Summary

Technical Problem

Existing rapid solidification sheet technology suffers from problems such as coarse dendritic crystals and uneven distribution of the second phase, making it difficult to achieve uniform refinement and good orientation of columnar crystals.

Method used

By simulating the resonant state of the copper roller, selecting appropriate vibration modes and frequencies, installing an ultrasonic wave introduction device, and applying ultrasonic waves to the surface of the copper roller, the ultrasonic parameters are adjusted in real time to optimize the nucleation rate and suppress coarse grain growth, thereby obtaining a refined columnar crystal structure.

Benefits of technology

It significantly improved the nucleation rate, refined the columnar crystals, enhanced the microstructure uniformity and thickness consistency of the rapidly solidified sheets, improved the orientation of the magnetic phase, and improved the overall performance of the magnet.

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Abstract

The application provides a method for optimizing microstructure of a neodymium-iron-boron magnet rapid solidification sheet by using ultrasonic waves, and belongs to the technical field of neodymium-iron-boron alloy rapid solidification casting sheet. The application applies ultrasonic vibration on a copper roller by using an ultrasonic wave introduction device while the copper roller is rotating, then neodymium-iron-boron alloy melt is cast onto the surface of the copper roller to obtain a neodymium-iron-boron magnet rapid solidification sheet; the initial driving frequency of the copper roller is accurately designed and the amplitude is limited during the casting process, so that the nucleation rate of the magnetic phase grains near the roller surface of the rapid solidification sheet is increased, the growth of the magnetic phase grains in the direction from the near roller surface to the far roller surface is promoted, the magnetic phase columnar crystals are effectively refined, and the uniformity of the microstructure and the thickness consistency of the rapid solidification sheet are significantly improved, so that the effects of improving the nucleation rate and inhibiting the growth of coarse crystals are achieved, and finally the rapid solidification sheet with refined columnar crystals and good orientation is obtained.
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