A method for preparing a sintered NdFeB magnet with high remanence and high coercivity
CN116230380BActive Publication Date: 2026-06-23HANGZHOU DIANZI UNIV +1
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HANGZHOU DIANZI UNIV
- Filing Date
- 2022-12-20
- Publication Date
- 2026-06-23
AI Technical Summary
Technical Problem
Existing technologies for preparing sintered NdFeB magnets with both high remanence and high coercivity suffer from high cost and complicated processes, and also have requirements on magnet size.
Method used
Sintered NdFeB magnets were prepared using RFeBTm matrix raw materials with a weight ratio of R 28wt%-33wt%, B 0.8wt%-1.2wt%, Tm 1wt%-3wt%, and the balance being Fe, combined with Tb-Al alloy powder, through steps such as melting, hydrogen crushing, air jet milling, orientation forming, isostatic pressing, and heat treatment.
Benefits of technology
High remanence and high coercivity sintered NdFeB magnets, which are not limited by magnet size, are prepared with reduced grain size, uniform microstructure, and improved magnetic properties.
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Smart Images
Figure CN116230380B_ABST
Abstract
The present application relates to sintered neodymium-iron-boron magnet technical field, especially relates to a kind of preparation method of sintered NdFeB magnet with high remanence and high coercivity.The method is first prepared neodymium-iron-boron alloy and Al2Tb alloy respectively, then the alloy is mixed after using two kinds of alloy, after airflow mill, orientation forming, isostatic pressing, sintering, heat treatment to obtain sintered NdFeB magnet.The magnet prepared using the method is a kind of sintered NdFeB magnet with high remanence and high coercivity;The grain size of the obtained magnet is significantly reduced, and the structure is uniform, and the realization of such ideal organizational structure finally improves the magnetic properties of the magnet.
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