Rare earth permanent magnet powder, preparation method thereof, bonded permanent magnet containing same and device

Abstract

The invention discloses rare earth permanent magnet powder, a preparation method thereof, a bonded permanent magnet containing the same and a device. The rare earth permanent magnet powder is composed of Fe<100-x-y-z>Nd<y>Q<z>N<x>, wherein the Q is B or B and C, the x is larger than or equal to 0.8 and smaller than or equal to 3.5, the y is larger than or equal to 5 and smaller than or equal to 15, and the z is larger than or equal to 4 and smaller than or equal to 10. The main phase of the rare earth permanent magnet powder is of an Nd<2>Fe<14>B structure, and one or more of the coercive force and the maximum magnetic energy product of the rare earth permanent magnet powder are over 95% of the performance of a corresponding magnet without nitrogen elements. According to the rare earth permanent magnet powder, the preparation method thereof, the bonded permanent magnet containing the same and the device, the main phase structure of the rare earth permanent magnet powder is the Nd<2>Fe<14>B phase, and it can be guaranteed that the rare earth permanent magnet powder has certain residual magnetism and the coercive force; the N elements are introduced, and it is defined that one or more of the coercive force and the maximum magnetic energy product of the rare earth permanent magnet powder are over 95% of the performance of a corresponding magnet without nitrogen elements, so that influences on the Nd<2>Fe<14>B structure of introduction of the N is lowered, the anti-corrosion property of the rare earth permanent magnet powder is improved without greatly lowering the magnetic performance, and the stability of the magnet is guaranteed.

Description

technical field [0001] The invention relates to the field of rare earth permanent magnet materials, in particular to a rare earth permanent magnet powder, a preparation method thereof, a bonded magnet containing the same and a device. Background technique [0002] Neodymium-iron-boron (NdFeB) rare earth permanent magnet materials have become an irreplaceable basic material in many fields, and are widely used in many fields such as electronics, automobiles, and computers, driving the development of various industries. NdFeB series rare earth permanent magnet materials are generally required to work at a certain temperature and environment, and are required to maintain the integrity of their dimensions and the stability of their magnetic properties during the long-term work process. However, due to the poor corrosion resistance of the material, the composition and structure of the local area of ​​the surface will change after corrosion, which will affect the stability of its a...

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Problems solved by technology

[0007] In order to improve the poor anticorrosion performance of existing rare earth permanent magnets, the present invention aims to start from the magnetic powder used in bonded magnets, and provide a rare earth permanent magnet powder, its preparation method, bonded magnets and devices including it, without greatly reducing the On the basis of magnetic properties, the corrosion resistance of rare earth permanent magnet powder is improved, thereby ensuring the stability of the magnet

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