Method and equipment for laser cladding of heavy rare earth wire on surface of neodymium iron boron

Abstract

The invention discloses a method and equipment for laser cladding of a heavy rare earth wire on the surface of neodymium iron boron, relates to the technical field of manufacturing of permanent magnet materials, and is mainly used for solving the problems that an existing method for coating the surface of a neodymium iron boron permanent magnet material with heavy rare earth elements is complex in process and uneven in distribution of the heavy rare earth elements. The method comprises the following steps of: S1, pretreating a neodymium iron boron permanent magnet material; S2, introducing the material into a vacuum chamber and a transition chamber; S3, guiding the treated material into a coating chamber, and coating a wire containing heavy rare earth elements by laser; and S4, performing cooling. The equipment structurally comprises a conveyor belt, and an acidification pool, an isostatic pressing chamber, a vacuum chamber, a transition chamber, a coating chamber and a cooling chamber which are sequentially arranged along the conveyor belt. According to the method and equipment for laser cladding of the heavy rare earth wire on the surface of the neodymium iron boron, the surface of the neodymium iron boron permanent magnet material can be uniformly coated with the heavy rare earth element by using a laser coating method, and meanwhile, the preparation process is also simplified.

Description

technical field [0001] The invention relates to the technical field of permanent magnet material production, in particular to a method and equipment for laser cladding heavy rare earth wire on the surface of NdFeB. Background technique [0002] NdFeB permanent magnet material is a kind of permanent magnet material with the best comprehensive magnetic properties at present. An important index to measure the performance of NdFeB permanent magnet materials is coercive force, and the common way to improve coercive force is to dope NdFeB permanent magnet materials with heavy rare earth elements, such as dysprosium (Tb), terbium (Dy) and holmium (Ho). However, the extraction of heavy rare earth elements is difficult, easy to pollute the environment, and the cost is high. Even if the amount of doped heavy rare earth elements is small, it still occupies a large part of the production cost. Therefore, how to reduce the usage of heavy rare earths under the premise of ensuring perfor...

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Problems solved by technology

However, these methods cannot guarantee that the powders have the same particle size, nor can they guarantee the number of powders in a unit space, so there is uneven distribution of heavy rare earth elements and poor bonding performance, which leads to the heavy rare earth coating layer being easy to change from NdFeB permanent The problem of the magnetic material matrix falling off

At the same time, the existing method also has the defect of complex process

In addition, none of the existing NdFeB permanent magnet material coating methods can coat irregular NdFeB permanent magnet materials with many surface defects.

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