Method and equipment for laser cladding heavy rare earth wire on NdFeB surface

Abstract

The invention discloses a method and equipment for laser cladding heavy rare earth wire on the surface of NdFeB, relates to the technical field of permanent magnet material production, and is mainly used to solve the problem of coating heavy rare earth elements on the surface of existing NdFeB permanent magnet materials The method has the problems of complicated process and uneven distribution of heavy rare earth elements. The method includes the following steps: S1, pretreatment of NdFeB permanent magnet materials; S2, introduction into a vacuum chamber and a transition chamber; S3, introduction into a coating chamber, and laser coating of wires containing heavy rare earth elements; S4, cooling. Its structure includes: a conveyor belt, an acidification tank, an isostatic pressure chamber, a vacuum chamber, a transition chamber, a coating chamber and a cooling chamber arranged sequentially along the conveyor belt. A method and equipment for laser cladding heavy rare earth wire on the surface of NdFeB provided by the present invention, using the laser coating method, can evenly coat heavy rare earth elements on the surface of NdFeB permanent magnet materials, and at the same time simplify Preparation Process.

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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