CN-224232425-U - Neodymium iron boron magnet

Abstract

The utility model provides a neodymium-iron-boron magnet which comprises a neodymium-iron-boron substrate, a metal layer and an organic film layer which are sequentially arranged, wherein the metal layer comprises a substrate layer and a rough layer close to one side of the organic film layer, and the roughness Ra of the surface of one side of the rough layer close to the organic film layer is 0.25-0.38 mu m. The utility model can improve the binding force between the organic film layer and the metal layer and the corrosion resistance of the NdFeB magnet while not penetrating through the electroplated metal layer.

Inventors

• ZHANG LONG
• ZHANG XINGONG
• HE YUANHUI
• YU HAIHUA
• BAI XIAOGANG
• PAN GUANGHUI

Assignees

• 天津三环乐喜新材料有限公司

Dates

Publication Date

20260512

Application Date

20250508

Claims (9)

1. 1. The neodymium-iron-boron magnet is characterized by comprising a neodymium-iron-boron substrate, a metal layer and an organic film layer which are sequentially arranged; Wherein the metal layer comprises a substrate layer and a rough layer close to one side of the organic film layer; the NdFeB matrix and the rough layer are completely isolated by the matrix layer; The roughness Ra of the surface of the rough layer, which is close to one side of the organic film layer, is 0.25-0.38 mu m.
2. 2. The neodymium-iron-boron magnet according to claim 1, wherein the thickness of the metal layer is 3-10 μm.
3. 3. Neodymium-iron-boron magnet according to claim 1 or 2, characterized in that the thickness of the neodymium-iron-boron matrix is 1-10 mm.
4. 4. The neodymium-iron-boron magnet according to claim 1, wherein the thickness of the organic film layer is 10-20 μm.
5. 5. The neodymium-iron-boron magnet according to claim 1, wherein the thickness of the rough layer is 1-2 μm.
6. 6. The neodymium-iron-boron magnet according to claim 1, wherein the roughness Ra of the surface of the rough layer, which is close to the side of the organic film layer, is 0.28-0.38 μm.
7. 7. A neodymium-iron-boron magnet according to claim 1, wherein the roughened layer completely covers the base layer.
8. 8. A neodymium-iron-boron magnet according to claim 1, wherein said metal layer comprises a copper layer.
9. 9. A neodymium-iron-boron magnet according to claim 1, wherein said organic film layer comprises an epoxy layer.

Description

Neodymium iron boron magnet Technical Field The utility model relates to the technical field of neodymium-iron-boron magnets, in particular to a neodymium-iron-boron magnet. Background The magnetic material has wide application in the strategic fields of aviation, aerospace, military industry, electronic components and the like, and the permanent magnetic material is that the external magnetic field is removed after the magnet is magnetized by the external magnetic field, and the magnet still keeps strong magnetism. The permanent magnetic material mainly comprises five main types of permanent magnetic ferrite, iron-chromium-cobalt permanent magnetic material, aluminum-nickel-cobalt permanent magnetic material, rare earth permanent magnetic material and composite permanent magnetic material. NdFeB is used as a third-generation rare earth permanent magnet material, and is widely applied in various fields due to rich raw material resource storage, mature and simple processing technology and low cost. The magnetic field energy product, coercive force and energy density are extremely high, meanwhile, the magnetic field energy product, coercive force and energy density are good in stability on heat and time, the capability of resisting the interference of an external magnetic field is high, and the excellent performances enable the neodymium-iron-boron magnet to have a large market in the production of modern industrial electronic components and parts, and the magnetic field energy product can be used for various thin, small and light motors, magnetic separation instruments, meters and other equipment. However, under the external environment, the neodymium iron boron permanent magnet material is easy to generate oxidation and hydrogen absorption reaction to be corroded, and is generally corroded by adopting an alloying or surface treatment method, the corrosion resistance and the insulation performance of the matrix are improved by forming an epoxy film layer on the surface of the neodymium iron boron matrix in the prior scheme, but the wear resistance of the epoxy film layer is poor, and the corrosion resistance of the matrix is reduced after the epoxy film layer is damaged, so that a metal backing film layer can be formed on the surface of the matrix, and the corrosion resistance of the matrix is further ensured. However, the formed metal backing film layer is generally performed in an electroplating manner, and the surface of the metal backing film layer is smooth, for example, an epoxy film layer is formed on the surface of the electroplated metal layer by adopting a spraying process, so that the bonding force between the epoxy film layer and the metal backing film layer is poor, and the situation that the epoxy film layer falls off easily occurs. Therefore, there is a need to improve the layer structure of neodymium-iron-boron magnets to improve corrosion resistance. Disclosure of utility model Aiming at the defects existing in the prior art, the utility model aims to provide the neodymium iron boron magnet, which can ensure that a substrate layer which is completely covered on the surface of a neodymium iron boron substrate is formed by forming a rough layer on the surface of a metal layer, and the roughness Ra of the rough layer is moderate, so that the binding force of an organic film layer and the metal layer can be enhanced, and the corrosion resistance is improved. To achieve the purpose, the utility model adopts the following technical scheme: The utility model provides a neodymium-iron-boron magnet which is characterized by comprising a neodymium-iron-boron substrate, a metal layer and an organic film layer which are sequentially arranged, wherein the metal layer comprises a substrate layer and a rough layer close to one side of the organic film layer, the neodymium-iron-boron substrate and the rough layer are completely isolated by the substrate layer, the roughness Ra of one side surface of the rough layer close to the organic film layer is 0.25-0.38 mu m, for example, 0.25 mu m, 0.27 mu m, 0.28 mu m, 0.3 mu m, 0.31 mu m, 0.33 mu m, 0.34 mu m, 0.36 mu m, 0.37 mu m or 0.38 mu m and the like, and other non-enumerated values are applicable in the range. According to the neodymium-iron-boron magnet provided by the utility model, as the metal layer is provided with the matrix layer and the rough layer close to one side of the organic film layer, the rough layer can obviously increase the binding force with the organic film layer, and the matrix layer can ensure the corrosion resistance of the neodymium-iron-boron matrix, so that the application prospect of the neodymium-iron-boron magnet in various fields such as automobile industry, electronic products, wind power, elevators, industrial robots, aerospace and the like can be expanded. The rough layer and the substrate layer both belong to metal layers, wherein the rough layer is obtained by performing sand blasting treatment on an electroplated metal la