Lanthanide rare earth permanent magnetic powder and manufacturing method thereof

Abstract

The invention discloses lanthanide rare earth permanent magnetic powder and a manufacturing method thereof. The lanthanide rare earth permanent magnetic powder is polycrystalline powder containing columnar crystals. The volume ratio of columnar crystals is larger than 60%, and the component is R-T-B, wherein R represents at least one of 15 lanthanide rare earth elements, the content of R is 30.0-33.0 wt%, B is boron and hydrogen, the content of B is 1.0-1.2 wt%, the content of hydrogen is 0.05-0.8 wt%, and the balance T represents at least one of Fe, Ti, Cr, Mn, Ni, Cu, Zn, Nb, Al, Ga, Ge, Sn, Pb, Mg and Ca. The manufacturing method includes the steps of preparing a precursor alloy cast strip to adsorb hydrogen and preparing a precursor alloy cast strip to adsorb hydrogen and remove hydrogen. The lanthanide rare earth permanent magnetic powder is magnetic powder containing a small amount of hydrogen, the oxygen content of the magnetic powder can be easily reduced, and the permanent magnetic powder has the advantages of being uniform in granularity distribution, high in columnar crystal proportion and the like. The manufacturing method developed for manufacturing the lanthanide rare earth permanent magnetic powder is another aim.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a lanthanide rare earth permanent magnet powder and a manufacturing method thereof. Background technique [0002] The advent of NdFeB permanent magnets has injected new vigor and vitality into the high-tech field of rare earths. NdFeB magnets have a high magnetic energy product and are known as the contemporary "king of permanent magnets". They are widely used in electronics, machinery and other industries due to their excellent performance. [0003] The preparation process of sintered NdFeB magnets generally includes five major steps: ingot / cast sheet→coarse crushing→jet milling→press molding→sintering, among which coarse crushing and jet milling belong to the powder making process. The performance of magnetic powder is crucial to the preparation of high-performance NdFeB magnets. Generally, it is required that the magnetic powder particles should be evenly distributed, ...

AI Technical Summary

Problems solved by technology

However, the coarse powder particles prepared by mechanical crushing are not evenly distributed, relatively discrete, and have high oxygen content.