Sintered neodymium-iron-boron magnet with high toughness and manufacturing method thereof

Abstract

The invention provides a sintered neodymium-iron-boron magnet with high toughness and a manufacturing method thereof, and the manufacturing method comprises the following steps: respectively preparing a main phase alloy consisting of 9-16 wt% of Nd, 3-6 wt% of Pr, 5-16 wt% of Ce, 0.95-1.1 wt% of B, 0.8-4.8 wt% of a metal mixture consisting of at least two of Gd, Co, Ga and Zr and the balance of Fe, and a main phase alloy consisting of 40-55 wt% of Nd, 3-6 wt% of Pr, 5-16 wt% of Ce, 0.95-1.1 wt% of B, 0.8-4.8 wt% of a metal mixture consisting of at least two of Gd, Co, Ga and Zr and the balance of Fe, the preparation method comprises the following steps: respectively smelting the main phase alloy and the auxiliary phase alloy, carrying out melt-spinning casting on the main phase alloy and the auxiliary phase alloy to obtain cast sheets, mixing the cast sheets of the main phase alloy and the cast sheets of the auxiliary phase alloy according to the mass percent of 90-97% and the mass percent of 3-10%, and carrying out hydrogen decrepitation and jet milling, so as to obtain the high-strength alloy. And performing magnetic field orientation compression molding, vacuum isostatic pressing, vacuum sintering and heat treatment to prepare the sintered neodymium-iron-boron magnet with high toughness and strong impact resistance.

Description

technical field [0001] The invention relates to the technical field of sintered NdFeB magnets, in particular to a sintered NdFeB magnet with high toughness and a manufacturing method thereof. Background technique [0002] Sintered NdFeB magnet is a rare earth iron permanent magnet functional material, and its comprehensive magnetic properties are the most excellent among the permanent magnet materials discovered so far. The market of sintered NdFeB magnets covers many fields such as computers, communications, electroacoustics, new energy, aerospace, automobiles, industrial servo motors, and household appliances. Since the sintered NdFeB magnet contains about 30% metal Nd (neodymium), this kind of rare earth metal is a relatively rare and expensive material. Due to cost considerations, for some low-performance grades of sintered NdFeB magnets in the industry, relatively low-priced metal Ce (cerium) is usually used to partially replace metal neodymium. However, the addition ...

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Problems solved by technology

[0003] The technical problem to be solved by this technical solution is how to improve the impact toughness of sintered NdFeB magnet materials, so as to avoid a large number of defective products produced by sintered NdFeB magnet materials in the subsequent processing of finished products, so as to ensure that the processed products have higher The qualified rate, and to a certain extent, reduce the waste of resources, and can improve the production profit of the enterprise

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