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Surface protection method for samarium-cobalt magnet workpiece

A workpiece surface, samarium cobalt magnet technology, applied in electrical components, metal material coating process, inductance/transformer/magnet manufacturing and other directions, can solve problems such as magnetic performance attenuation, to improve magnetic performance attenuation, excellent high temperature stability, The effect of improving the protective performance

Active Publication Date: 2016-04-27
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a method for protecting the surface of a samarium-cobalt magnet workpiece, depositing a Ni-based thin film on the surface of the pretreated samarium-cobalt magnet workpiece, so as to improve the problem that the samarium-cobalt magnet workpiece will be oxidized in a high-temperature environment and cause magnetic performance attenuation

Method used

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  • Surface protection method for samarium-cobalt magnet workpiece
  • Surface protection method for samarium-cobalt magnet workpiece

Examples

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Embodiment 1

[0037] In this embodiment, a NiCrAlY protective film is deposited on the surface of a samarium-cobalt magnet workpiece by magnetron sputtering, and the composition of the protected samarium-cobalt magnet is Sm(Co 0.68 Fe 0.22 Cu 0.08 Zr 0.02 ) 7.2 . Including the following steps

[0038] (1) Choose two Ni 30 Cr 8 Al 0.5 The Y alloy target is installed on the magnetron sputtering source in the vacuum chamber;

[0039] (2) Polish the surface of the samarium-cobalt magnet workpiece with SiC water sandpaper according to 280#, 600#, 1200#, 2000# in sequence, and then polish it with aluminum oxide solution on the flannelette; then use alcohol and acetone to ultrasonically clean the workpiece in turn 10min;

[0040] (3) Place the samarium cobalt magnet workpiece on the sample turntable after drying;

[0041] (4) First use the mechanical pump to pre-evacuate to less than 20Pa, then turn on the molecular pump to evacuate, so that the vacuum degree in the vacuum chamber reache...

Embodiment 2

[0046] figure 1 It is a flow chart of the method for protecting the surface of a samarium-cobalt magnet workpiece in this embodiment.

[0047] In this embodiment, the magnetron sputtering method is used to deposit NiCrAlY+Al on the surface of the samarium cobalt magnet workpiece. 2 o 3 Protective film, the composition of the protected samarium cobalt magnet is Sm(Co 0.68 Fe 0.22 Cu 0.08 Zr 0.02 ) 7.2 . Including the following steps:

[0048] (1) Choose two Ni 30 Cr 8 Al 0.5 The Y alloy target is installed on the magnetron sputtering source in the vacuum chamber;

[0049] (2) Two Al targets are selected and installed on the magnetron sputtering source in the vacuum chamber

[0050] (3) Polish the surface of the samarium-cobalt magnet workpiece with SiC water sandpaper according to 280#, 600#, 1200#, 2000# in sequence, and then polish it with aluminum oxide solution on the flannelette; then use alcohol and acetone to ultrasonically clean the workpiece 10min;

[005...

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Abstract

The invention discloses a surface protection method for a samarium-cobalt magnet workpiece. The surface protection method comprises the following steps: depositing an Ni-based thin film on the surface of a pretreated samarium-cobalt magnet workpiece; and then carrying out vacuum heat treatment to obtain a surface protected samarium-cobalt magnet. In the surface protection method, the Ni-based thin film of a compact structure is obtained through the deposition on the surface of the samarium-cobalt magnet, so that oxidizing media can be effectively isolated; a protective film is redeposited on the surface of the Ni-based thin film, so that the protective performance of the thin film can also be improved furthermore; the deposited Ni-based thin film and Al2O3 thin film are of excellent high-temperature stability, so that samarium cobalt can be effectively protected under a high temperature, and then the problem that the samarium-cobalt magnet workpiece can be oxidized in a high-temperature environment to cause magnetic performance degradation is improved.

Description

technical field [0001] The invention relates to the field of surface protection of magnets, in particular to a method for surface protection of samarium cobalt magnet workpieces. Background technique [0002] Samarium-cobalt magnets have high Curie temperature (800-850°C), high magnetic energy product (22-32MGOe), strong oxidation resistance and corrosion resistance, and good temperature stability. It has been widely used in the field of defense and national defense, but the oxidation of samarium cobalt magnets in the high-temperature aerobic environment above 300 ℃ forms surface oxidation regions, and the phenomenon of Sm removal occurs at the same time, which makes the magnetic properties of samarium cobalt magnets drop sharply. [0003] The use of surface protection technology is an effective method to improve the high temperature oxidation resistance of samarium cobalt magnets and reduce the magnetic loss of permanent magnets. In recent years, there are not many studies...

Claims

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Application Information

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IPC IPC(8): H01F41/02C23C14/22C23C14/18C23C14/06
Inventor 宋振纶冒守栋晏敏胜聂霞张丽娇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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