Composite zinc and gadolinium added neodymium iron boron bonded magnet powder and preparation method thereof

Abstract

The invention relates to the technical field of permanent magnet material processing, and particularly relates to composite zinc and gadolinium added neodymium iron boron bonded magnet powder and a preparation method thereof. The magnet powder comprises the following elements: 10-11% of Nd, 1.0-2.6% of Gd, 6-7% of B, 0.2-0.5% of Zn, and the balance Fe. According to the composite zinc and gadolinium added neodymium iron boron bonded magnet powder, zinc and gadolinium are added, so that the temperature coefficients of a magnet can be reduced; the alpha-Fe crystallizing temperature increases; alpha-Fe and Nd2Fe14B can be synchronously separated out while rapidly-quenched NdFeB alloy is crystallized, so that alpha-Fe can be prevented from being separated out and growing firstly; crystal seeds are refined; the exchanging and coupling effects of crystal seeds are improved; effective nailing positions are increased, and the Hcj and Hk of the bonded magnet powder can be effectively increased; in addition, zinc and gadolinium coordinately act, the internal and external combination is realized, and the corrosion resistance of the prepared bounded magnet powder can be improved. With the adoption of the method, the parameters such as the smelting temperature, the vacuum degree, the quenching speed and the crystallizing temperature are limited, and the comprehensive performances of the magnet powder are further improved.

Description

Technical field [0001] The invention relates to the technical field of permanent magnet material processing, in particular to a neodymium iron boron bonded magnetic powder compounded with zinc and gadolinium and a preparation method thereof. Background technique [0002] NdFeB permanent magnet materials have received extensive research and attention due to their high magnetic energy product and coercivity. They have been widely used in electronics, electricity, machinery, medical equipment and other fields, but due to their hard magnetic phase Nd 2 Fe 14 The Curie temperature of B is relatively low, and the temperature coefficient of remanence and coercivity are relatively large, which limits its application in some areas of higher working temperature. [0003] Both theory and practice show that adding certain alloying elements can not only improve the magnetic properties of the product, but also significantly improve the temperature characteristics of the neodymium-iron-boron perma...

AI Technical Summary

Problems solved by technology

However, due to the different crystallization behaviors of different metal elements, the various effects and mechanisms of NdFeB permanent magnet materials are also different. Usually, multiple metal elements are required to be added in combination to improve the comprehensive performance of NdFeB permanent magnet materials. Moreover, the addition amount of metal elements has a decisive effect on the performance modification of NdFeB permanent magnet materials. If the addition amount is not selected properly, it may even lead to adverse effects. Therefore, how to choose the appropriate metal elements and the appropriate addition amount to achieve Increasing the Curie temperature of NdFeB at low cost, improving its heat resistance and comprehensive magnetic properties has become a technical problem to be solved urgently.