Vacuum smelting and quick-setting equipment with material tank, permanent magnet alloy and manufacturing method of permanent magnet

Abstract

The invention discloses a vacuum smelting quick-setting equipment with a material tank. The vacuum smelting quick-setting equipment comprises a melting crucible, a tundish, a first rotating roller, a crushing device, and a receiving tank; the melting crucible, the tundish, the first A rotating roller is set in the vacuum shell, and a rotary mechanical crushing device is set under the first rotating roll. A valve is set under the mechanical crushing device. One end of the valve is connected with the vacuum shell, and the other end is connected with the receiving tank. The material tank is provided with a cooling device, and the cooling medium is one of water, refrigerant, argon, and nitrogen. The invention also discloses a method for producing neodymium-iron-boron rare-earth permanent magnet alloys and rare-earth permanent magnets by using the equipment of the invention.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnets, and in particular relates to a vacuum smelting quick-setting equipment with a material tank, a method for manufacturing rare earth permanent magnet quick-setting alloys, and a method for manufacturing rare earth permanent magnets; the equipment of the invention can also be used for rare earth storage Production of hydrogen alloys and vacuum quick-setting alloys. Background technique [0002] NdFeB rare earth permanent magnet materials, with their excellent magnetic properties, have been used more and more, and are widely used in medical nuclear magnetic resonance imaging, computer hard drives, audio, mobile phones, etc.; with the requirements of energy saving and low-carbon economy , NdFeB rare earth permanent magnet materials have begun to be used in auto parts, household appliances, energy saving and control motors, hybrid vehicles, wind power generation and other fields. [0003] I...

AI Technical Summary

Problems solved by technology

[0004] U.S. Patent No. 7,585, the manufacture method of the disclosed neodymium-iron-boron rare earth permanent magnet vacuum quick-setting alloy of 378, this method is as figure 1 As shown, the NdFeB raw material is melted in the crucible 1 and cast into the tundish 2, and the alloy liquid overflowing from the tundish is cooled and quickly solidified by the cooling roller 3 to form an alloy sheet 4, and the alloy sheet 4 is thrown to the rotating drum 5 with a heater , the temperature of the alloy sheet in the rotating cylinder is kept at 700-900°C; then the alloy sheet is cooled; the feature of the invention is that the alloy is rapidly cooled to 700-900°C, and then the alloy sheet is kept at 700-900°C, and the holding time is from More than 15 seconds to less than 600 seconds; Compared with the previous single-roller quick-setting technology and double-roller quick-setting technology, this invention diffuses the heavy rare earth element Dy into the main phase through heat preservation, which improves the coercive force of the magnet. The solidification temperature is higher than 700°C, the grain boundary phase is a liquid phase, the change of the grain boundary phase will cause abnormal growth of grains, and it is difficult to form uniform grains, from the contact roll surface with the cooling roll to the free surface grains From small to large, unable to control consistency

[0005] Chinese patent CN97,217,372.2 discloses the vacuum quick-setting equipment of twin-stick cooling, as figure 2 As shown, the alloy liquid of the equipment is cast into the gap between the cooling roll 7 and the cooling roll 8 through the funnel 6 to form an alloy sheet 9; The temperature of the alloy sheet after roll rolling is higher than 800°C. Although the double-roll rolling solves the problem of double-sided cooling, it cannot meet the requirements of refining grains, improving grain consistency, and thus increasing coercive force; In order to improve the shortcomings of the aforementioned patents, Chinese patent CN01,241,237.6 discloses the technology of adding a cooling roll under the twin-rollers on the basis of twin-roll rolling. Although this invention improves the performance of the aforementioned patents, the production of alloy sheets The thickness is increased, but it is still double-rolled, which cannot solve the problem that the temperature of the alloy sheet leaving the cooling roll is lower than 700 ° C, and cannot achieve the purpose of reducing the amount of heavy rare earth

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