Hybrid film coating method of neodymium iron boron rare earth permanent magnet device

Abstract

The invention discloses a hybrid film coating method of a neodymium iron boron rare earth permanent magnet device. According to the method, firstly, alloy smelting is carried out, alloy in a molten state is cast onto a rotary copper roller with a water cooling effect for being cooled to be manufactured into an alloy sheet, then, the alloy sheet is subjected to hydrogen decrepitation, material mixing and airflow powder grinding, next, materials are mixed by a material mixing machine and are then sent to a nitrogen gas protection magnetic field orientation pressing machine to be formed, the mixed materials are subjected to isostatic pressing after being encapsulated in a protection box, then, the sintering and the aging are carried out, a neodymium iron boron rare earth permanent magnet blank is prepared, the blank is subjected to machining, a neodymium iron boron rare earth permanent magnet is prepared, next, the neodymium iron boron rare earth permanent magnet is subjected to film coating, the neodymium iron boron rare earth permanent magnet device is formed, the film coating comprises three layers, the first layer and the second layer are magnetron sputtering coatings, and the second layer is a magnetron sputtering and multi-arc ion plating hybrid coating. The hybrid film coating is adopted as a surface treatment work procedure of the rare earth permanent magnet device, the anti-corrosion capability of the rare earth permanent magnet device is improved, and meanwhile, the magnetic performance of the rare earth permanent magnet device is also improved.

Description

technical field [0001] The invention belongs to the field of permanent magnet devices, in particular to a hybrid coating method for NdFeB rare earth permanent magnet devices. 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] The surface treatment process of rare earth permanent magnet devices in the prior art mainly includes electroplating Ni-Cu-Ni, electroplating Zn, electrophoresis, spraying and other technologies, and there is also a method of vacuum aluminum plating, such as Chinese patent ZL9619212...

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Problems solved by technology

[0005] The existing technology uses evaporation coating, the bonding force between the film layer and the substrate is poor, and there are deficiencies in improving the corrosion resistance of rare earth permanent magnet devices; there are also existing technologies that use magnetron sputtering coating, due to the low efficiency of magnetron sputtering, It is not suitable for low-cost mass production, and some have not solved the card installation technology, which is not easy to install, and the production is troublesome; some existing technologies use multi-arc ion coating, because there are large particles in the multi-arc ion coating, it cannot reach rare earth permanent magnet devices Corrosion resistance requirements; In order to solve the shortcomings of multi-arc ion plating, some people in the prior art thought of using multi-arc ion plating and magnetron sputtering mixed coating, but none of them solved the problem of high efficiency, low cost, mass production technology , there are deficiencies in the equipment structure; especially the electroplating chemical treatment process of the rare earth permanent magnet device in the prior art, the energy consumption is high and there is pollution, requiring expensive water treatment equipment, improper treatment has a serious impact on the ecological environment, because the production process of the present invention The process is carried out in a vacuum, without using environmental pollutants, and will not pollute the ecological environment. At the same time, it also eliminates the influence of the "battery" effect on the reduction of magnetic properties in the electroplating process.

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