Directional solidifying crystallization method of metal alloy magnet and device for implementing same

Abstract

The invention discloses a directional solidifying crystallization method of a metal alloy magnet and a device for implementing the same. The method specifically comprises the following steps: enabling the bottom end of the metal alloy magnet to be contacted with a cooling liquid surface, and heating the metal alloy magnet on the cooling liquid surface by high-frequency induction heating equipment; allowing the metal alloy magnet to enter cooling liquid at a steady rate along the fixed movement direction for solidifying crystallization; and applying a constant longitudinal magnetic field to the metal alloy magnet entering the cooling liquid in the cooling liquid, wherein, the direction of the longitudinal magnetic field is parallel to the movement direction of the metal alloy magnet. Compared with the prior art, the invention has the advantages of promoting grain orientation of the metal alloy magnet, improving crystallization orientation degree and enhancing anisotropy. In addition, the preferred method of the invention overcomes the problems of gravity segregation of alloy melt and too small and uncontrolled temperature gradient in the prior art.

Description

technical field [0001] The invention relates to the technical field of magnetic material preparation, in particular to a method for directional solidification and crystallization of a metal alloy magnet and a device for implementing the method. Background technique [0002] Among magnetic materials, high-performance magnetic materials have become the research focus of scientific and technological workers in various countries because of their wide application value. [0003] Directional solidification crystallization is one of the core factors to improve magnetic properties. At present, countries around the world often use out-of-furnace crystallization method, power reduction method and power reduction method to prepare directionally solidified metal alloy magnet materials. [0004] The out-of-furnace crystallization method is to pour molten metal alloy liquid into a mold whose top is covered with exothermic agent and cooled at the bottom, so that the casting is solidified f...

AI Technical Summary

Problems solved by technology

The grain size obtained by this method is smaller, the grain boundary is straighter than the previous two methods, and the columnar grain size is longer than them, but there is a problem of large temperature difference between the surface and the core of the metal alloy magnet and uneven cooling.

[0007] In addition, there are problems such as the specific gravity segregation of the metal alloy liquid in the above method, and the degree of crystal orientation of the metal alloy in the directional solidification and crystallization process needs to be improved.

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