Rare earth permanent magnet produced by using abundant rare earth La and preparation method thereof

Abstract

The invention discloses a rare earth permanent magnet produced by using abundant rare earth La and a preparation method of the rare earth permanent magnet. The method is a novel craft concept based on grain boundary reconstruction by atomic percentage, the main alloying component is (Nd1-x-yLaxREy) uFe100-u-v-wMvBw, the grain boundary auxiliary alloying component is R100-zM'z, the design of main alloying component and the craft of powder process aim at promoting phasing and stability of La2Fe14B, high potential elements, higher HA rare earth elements and nanometer powder are added in the compound design of main alloying component so as improve intrinsic corrosion resistance and comprehensive magnetic performance, wherein motive power of intergranular corrosion is reduced by the high potential elements, a hard magnetizing shell layer encircling the main phase boundary is formed by the higher HA rare earth elements in following sintering and technology of heating processing, and a grain boundary phase is modified by the nanometer powder. The rare earth permanent magnet produced by using the abundant rare earth La is capable of reducing cost effectively, and higher comprehensive magnetic performance and corrosion resistance performance of the magnet are guaranteed so as to satisfy market requirements.

Description

technical field [0001] The invention relates to a rare earth permanent magnet produced by using high-abundance rare earth La and a preparation method thereof. Background technique [0002] The reserve of La in the earth's crust ranks third among rare earth elements, second only to Ce and Nd, and is a high-abundance rare earth element; at the same time, La is not in the same period as Sc and Y, and the adjacent Ce is generally positive 4 The valence of La is stable, and it is separated from rare earth elements such as Pr and Nd by Ce. These factors provide convenience for the separation and purification of La; therefore, La is a low-cost and high-abundance rare earth element, and it is mainly used in petroleum sulfidation cracking catalysts. , optical glass for prisms, nickel metal hydride batteries, flints, anti-bending magnesium alloys and other fields. [0003] From the perspective of the application of permanent magnet materials, NdFeB and ferrite have nearly 2 / 3 and 1 / 3...

AI Technical Summary

Problems solved by technology

The La-rich phase is easily oxidized, resulting in insufficient densification during the sintering process. In order to increase the densification, the sintering temperature needs to be increased, but this will lead to further growth of the main phase grains, resulting in deterioration of magnetic properties (Tang, W.H., S .Zhou,et al.PREPARATION AND MICROSTRUCTURE OF LA-CONTAINING R-FE-B PERMANENT-MAGNETS.Journal of Applied Physics.1989,65,3142-3145)