A surface anti-oxidation treatment method of low demagnetization rate NdFeB permanent magnet powder

Abstract

The invention discloses a surface anti-oxidation treatment method of low demagnetization rate NdFeB permanent magnet powder, which belongs to the technical field of magnetic powder surface treatment technology, and a surface anti-oxidation treatment method of low demagnetization rate NdFeB permanent magnet powder. treatment, magnetic powder cleaning treatment, pre-anti-oxidation treatment on the surface of magnetic powder, and anti-oxidation treatment on the surface of magnetic powder. Oxidation treatment, while the anti-oxidation treatment is sprayed with treatment agent A and treatment agent B to achieve double anti-oxidation protection on the surface of the magnetic powder, effectively improving the oxidation resistance of the magnetic powder, and at the same time during the anti-oxidation treatment process on the surface of the magnetic powder Placed in a high-temperature agitator and sprayed, effectively improving the uniformity of film formation on the surface of the magnetic powder, thereby effectively improving the film quality.

Description

technical field [0001] The invention relates to the technical field of surface treatment technology of magnetic powder, more specifically, to a surface anti-oxidation treatment method of low demagnetization rate NdFeB permanent magnet powder. Background technique [0002] With the rapid development of high-tech industries, NdFeB permanent magnet powder is widely used in aviation, aerospace, navigation, automobiles and various precision instruments, small and medium-sized, micro high-efficiency motors, computers and IT technology equipment, office automation equipment and many household appliances. Electrical appliances and other fields, and continue to expand. [0003] The characteristics of NdFeB permanent magnet powder are: good magnetic properties, low demagnetization rate, and good mechanical properties, but its chemical oxidation resistance is not good, so its application range is still limited to a certain extent. The magnetic powder will also derive many oxides durin...

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Problems solved by technology

[0003] The characteristics of NdFeB permanent magnet powder are: good magnetic properties, low demagnetization rate, good mechanical properties, but its chemical oxidation resistance is not good, so it still limits its application range to a certain extent

The magnetic powder will also derive many oxides during the production process. These oxides are mixed with the magnetic powder. When the magnetic powder mixed with oxides is made into a magnet, it will seriously affect the magnetic performance of the magnet; It is easy to be oxidized and rusted in the environment, and the magnetic performance is reduced or damaged due to the failure of oxidation and peeling, which seriously affects the service life of NdFeB permanent magnets and reduces the stability and reliability of the product.

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