Process of electroplating Dy thin film on neodymium iron boron

Abstract

The invention discloses a process of electroplating a Dy thin film on neodymium iron boron, belonging to the technical field of metal material plating. The process comprises the following steps: implementing acid pickling on selected coarse powder by using nitric acid, and then implementing pretreatment such as ultrasonic vibration deashing; implementing dysprosium plating treatment on the coarse powder by using a dysprosium chloride acidic dysprosium plating process to obtain a thin dysprosium layer with 0.05-0.1um of dysprosium plated on the surface, and dewatering and drying the electroplated coarse powder to obtain a sintering magnet with 3.2-3.6um of main phase crystal grains and continuously and smoothly distributed grain boundary phases. According to the process disclosed by the invention, Dy elements are plated on surfaces of the main phase crystal grains of sintered neodymium iron boron by adopting an electroplating process rather than adopting a method of adding heavy rare earths Dy and Tb in a smelting process, and thus the problem that the Br content is reduced because Dy and Tb enter a main phase can be avoided.

Description

technical field [0001] The invention belongs to the technical field of plating of metal materials, and in particular relates to a process for electroplating Dy thin films of neodymium iron boron. Background technique [0002] The application fields of sintered NdFeB permanent magnets are becoming wider and wider. In recent years, sintered NdFeB permanent magnets have made great breakthroughs in the fields of automotive motors, wind power generators, servo motors, and linear motors. [0003] However, since rare earths are national strategic resources, especially heavy rare earths such as Dy and Tb, there are not many reserves, a large gap, and relatively expensive prices. In order to meet the higher operating temperature of various motors, the current sintered NdFeB manufacturers have to add more heavy rare earth elements Dy and Tb, and are forced to face the huge challenge of shortage of raw materials and rising costs. At present, some manufacturers are trying to infiltrat...

AI Technical Summary

Problems solved by technology

[0003] However, since rare earths are national strategic resources, especially heavy rare earths such as Dy and Tb, there are not many reserves, the gap is large, and the price is relatively expensive

In order to meet the higher operating temperature of various types of motors, the current sintered NdFeB manufacturers have to add more heavy rare earth elements Dy and Tb, and are forced to face the huge challenge of shortage of raw materials and rising costs

At present, some manufacturers are trying to infiltrate dysprosium Dy, but due to the limitations of infiltrating dysprosium Dy, on the one hand, it cannot penetrate too deeply; It is very easy to cause the Dysprosium that has finally infiltrated to be ground off, making it difficult to promote and utilize it in practice