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Rare earth permanent magnet material surface corrosion-resistant coating and preparation method thereof

A rare-earth permanent magnet and corrosion-resistant technology, which is applied in metal material coating process, permanent magnet manufacturing, coating, etc., can solve the problems of poor corrosion resistance of rare-earth permanent magnet materials, and avoid low-potential miscellaneous phases and micro-cracks , Improve the effect of corrosion resistance

Pending Publication Date: 2022-06-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcoming of poor corrosion resistance of rare earth permanent magnet materials, provide a kind of rare earth permanent magnet material surface corrosion resistant coating and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The rare earth oxide thin layer is formed on the surface of the NdFeB rare earth permanent magnet material by magnetron sputtering and in-situ oxidation treatment, which greatly improves the corrosion resistance of the rare earth permanent magnet material. The composition of NdFeB magnets, in mass percent, is (Pr 0.2 Nd 0.8 ) 30.2 Fe 67.8 (Cu 0.3 Ga 0.2 Al 0.35 Nb 0.15 ) 1 B 1 . The preparation method includes the following steps: (1) adopting the method of vacuum magnetron sputtering, selecting high-abundance light rare earth Nd and La metal targets, and the vacuum degree is 5×10 -4 Pa, deposit Nd / La double-layer film on the surface of NdFeB, that is, first deposit high abundance light rare earth Nd film (thickness 300nm), and then deposit high abundance light rare earth La film (thickness 500nm); (2) adopt atmosphere heat treatment The method of in-situ oxidation to form a surface corrosion-resistant coating, the temperature of the atmospheric heat treatment...

Embodiment 2

[0022] The rare earth oxide / nitride thin layer is formed on the surface of the high abundance rare earth permanent magnet material by magnetron sputtering and in-situ oxidation / nitridation treatment, which greatly improves the corrosion resistance of the rare earth permanent magnet material. The composition of the high-abundance rare earth permanent magnet material, in terms of mass percentage, is (Ce 0.5 Y 0.05 Pr 0.05 Nd 0.35 Gd 0.05 ) 30.8 Fe 66.7 (Cu 0.1 Co 0.4 Ga 0.1 Al 0.15 Zr 0.25 ) 1.5 B 1 . The preparation method includes the following steps: (1) adopting a vacuum magnetron sputtering method, selecting a high-abundance light rare earth Ce metal target, and the vacuum degree is 3×10 -3 Pa, deposit a Ce monolayer film (thickness 400nm) on the surface of NdFeB; (2) adopt the method of atmospheric heat treatment, in-situ oxidation / nitridation to form a surface corrosion-resistant coating, the temperature of atmospheric heat treatment is 500 ℃, and the tempera...

Embodiment 3

[0026] A rare earth nitride thin layer is formed on the surface of the 1:12 type rare earth permanent magnet material by magnetron sputtering and in-situ nitriding treatment, which greatly improves the corrosion resistance of the rare earth permanent magnet material. The composition of 1:12 type rare earth permanent magnet material, in mass percentage, is Sm 8 (Fe 0.8 Co 0.2 ) 73 Ti 8 V 8 Ga 1 Al 2 . The preparation method includes the following steps: (1) adopting the method of vacuum magnetron sputtering, selecting high-abundance light rare earth Nd and Ce metal targets, and the vacuum degree is 1×10 -4Pa, deposit Nd / Ce double-layer film on the surface of 1:12 rare earth permanent magnet material, that is, first deposit high abundance light rare earth Nd film (thickness 500nm), and then deposit high abundance light rare earth Ce film (thickness 800nm); ( 2) Using the method of atmospheric heat treatment, in-situ nitridation forms the surface corrosion-resistant coati...

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Abstract

The invention discloses a rare earth permanent magnet material surface corrosion-resistant coating and a preparation method thereof. A rare earth oxide / nitride thin layer is formed on the surface of a rare earth permanent magnet material through magnetron sputtering and in-situ oxidation / nitridation treatment. The preparation method comprises the following steps: (1) depositing a high-abundance light rare earth La / Ce / Y / Nd single-layer film or multi-layer composite film on the surface of the rare earth permanent magnet material by adopting a vacuum magnetron sputtering method; and (2) an atmosphere heat treatment method is adopted, and the surface corrosion-resistant coating is generated through in-situ oxidation / nitridation. According to the method, magnetron sputtering and in-situ oxidation / nitriding treatment are combined, a uniform, compact and stable coating is formed, the corrosion resistance of the rare earth permanent magnet material can be greatly improved, and the service life of the material is prolonged.

Description

technical field [0001] The invention relates to the field of corrosion protection, in particular to a corrosion-resistant coating on the surface of a rare earth permanent magnet material and a preparation method thereof. Background technique [0002] Rare earth elements are known as the "treasure house of new materials in the 21st century" because of their unique 4f electronic structure and excellent magnetic, optical, and electro-chemical properties, and are indispensable key strategic resources for the development of emerging high-tech industries and cutting-edge defense technologies. Rare earth permanent magnet materials formed by combining 4f rare earths with 3d transition metals, including the first generation of SmCo developed in the 1960s 5 system, the second generation Sm developed in the 1970s 2 Co 17 system and the third generation Nd developed in the 1980s 2 Fe 14 The B series exhibits excellent magnetic properties that are different from traditional permanent...

Claims

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Application Information

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IPC IPC(8): C23C14/16C23C14/35C23C14/58H01F41/02
CPCC23C14/35C23C14/165C23C14/5806C23C14/5853C23C14/586H01F41/026
Inventor 金佳莹俞钧耀缪之恺冯海龙谢清松严密
Owner ZHEJIANG UNIV
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