Cerium-containing magnet with high coercivity and preparation method thereof

Abstract

The invention discloses a preparation method of a cerium-containing magnet with high coercivity. The method comprises steps that raw materials of the Ce-containing main alloy are blended; raw materials of the grain boundary optimization auxiliary alloy are blended; the raw materials of the Ce-containing main alloy and the raw materials of the grain boundary optimization auxiliary alloy are subjected to vacuum smelting and rapid hardening melt-spinning treatment correspondingly, and a Ce-containing main alloy rapid hardening sheet and a boundary optimization auxiliary alloy rapid hardening sheet are obtained; the Ce-containing main alloy rapid hardening sheet and the grain boundary optimization auxiliary alloy rapid hardening sheet are mixed according to a weight ratio of 1:x, then hydrogendecrepitation treatment and jet milling treatment are performed to obtain mixed powder, lubricating agent is added into the mixed powder and mixed to obtain mixture; magnetic field orientation compression of the mixture is performed, and isostatic cool pressing is performed to obtain a green body; sintering of the green body is performed, and then tempering heat treatment is performed to obtain acerium-containing magnet. The method is advantaged in that the preparation process is effectively simplified, and the risk that the auxiliary alloy is oxidized can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet preparation, and in particular relates to a high coercive force cerium-containing magnet and a preparation method thereof. Background technique [0002] Sintered NdFeB magnets have the characteristics of high magnetic energy product and high coercive force at the same time, and are widely used in electronic products, wind power generation, new energy vehicles, industrial motors and other fields. In sintered NdFeB magnets, rare earths such as praseodymium, neodymium, dysprosium, and terbium are crucial and irreplaceable core raw materials. Although China is the largest owner of rare earth mines in the world, since it supplies more than 90% of the world's demand for rare earth raw materials, it has brought enormous pressure and risks to the country's sustainable development of rare earth resources. The Baiyun Obo Mine in Inner Mongolia is the largest bastnaesite rare earth mine in the wor...

AI Technical Summary

Problems solved by technology

However, in the engineering batch production process, after the auxiliary alloy with high rare earth content is prepared into a fine powder below 4 μm, it is very easy to oxidize, and it is difficult to store for a long time. If the air is not properly isolated during the storage process, it may even occur fire accident

After the auxiliary alloy is oxidized and then mixed with the main alloy, it will not be able to modify the grain boundary, let alone improve the magnetic properties

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