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Method for strengthening metal protective coating based on high-repetition-frequency ultrashort pulse laser

A technology of ultra-short pulse laser and metal protection, which is applied in the direction of metal material coating process, coating, vacuum evaporation plating, etc., and can solve problems such as weak coating adhesion, coating surface ablation, and obvious heat-affected zone , to achieve the effect of reducing surface roughness, refining surface grains and improving high temperature oxidation resistance

Pending Publication Date: 2022-06-24
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the general laser strengthening technology, there are microcracks on the surface of the remelting strengthening layer, the heat affected zone is obvious, there is an obvious gap between the remelting layer and the substrate, the coating is weak, and there are problems such as ablation of the coating surface.

Method used

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  • Method for strengthening metal protective coating based on high-repetition-frequency ultrashort pulse laser
  • Method for strengthening metal protective coating based on high-repetition-frequency ultrashort pulse laser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The metal protective coating NiCoCrAlY with an initial roughness of 3.5 μm and a thickness of 40 μm prepared by arc ion plating was sequentially cleaned by acetone, alcohol and deionized water, and then the surface was dried. The dried coating was placed in the processing chamber, and Ar gas was introduced into the processing chamber at an air flow rate of 20 L / min. After the processing chamber was filled with Ar gas, the processing was carried out. Focus the ultrashort pulse laser on the surface of the sample to be processed, and adjust the relevant corresponding laser processing parameters: the repetition frequency is 20MHz, the pulse width is 250fs, the spot diameter is 20μm, the laser wavelength is 1030nm, and the laser single pulse energy density is 0.2 J / cm 2 , the scanning speed of the galvanometer is 40mm / s, the processing path is horizontal, the scanning distance is 15μm, and the number of scanning is 1 time. On the surface of the processed coating, it can be ...

Embodiment 2

[0026] A metal protective coating NiCrAlY with an initial roughness of 5 μm and a thickness of 50 μm was prepared by arc ion plating using acetone, alcohol and deionized water in turn. Surface cleaning treatment followed by surface drying. The dried coating was placed in the processing chamber, and Ar gas was introduced into the processing chamber at an air flow rate of 15 L / min. After the processing chamber was filled with Ar gas, the processing was performed. Focus the ultrashort pulse laser on the surface of the sample to be processed, and adjust the relevant corresponding laser processing parameters: the repetition frequency is 20MHz, the pulse width is 300fs, the spot diameter is 20μm, the laser wavelength is 1030nm, and the laser single pulse energy density is 0.16 J / cm 2 , the scanning speed of the galvanometer is 50mm / s, the processing path is horizontal, the scanning distance is 20μm, and the number of scanning is 1 time.

[0027] On the surface of the processed coa...

Embodiment 3

[0030] A metal protective coating NiAlY with an initial surface roughness of 3.8 μm and a thickness of 60 μm was prepared by arc ion plating using acetone, alcohol and deionized water in turn. Surface cleaning treatment followed by surface drying. The dried coating was placed in the processing chamber, and Ar gas was introduced at an airflow rate of 18 L / min, and the processing chamber was filled with Ar gas before processing. Focus the ultrashort pulse laser on the surface of the sample to be processed, and adjust the relevant corresponding laser processing parameters: the repetition frequency is 20MHz, the pulse width is 1ps, the spot diameter is 20μm, the laser wavelength is 1030nm, and the laser single pulse energy density is 0.38 J / cm 2 , the scanning speed of the galvanometer is 20mm / s, the processing path is horizontal, the scanning distance is 20μm, and the number of scanning is 1 time.

[0031] On the surface of the processed coating, it can be observed that the thi...

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Abstract

The invention relates to the technical field of metal protective coating surface strengthening, in particular to a method for strengthening a metal protective coating based on high repetition frequency ultrashort pulse laser. According to the method, the metal protective coating prepared through arc ion plating is subjected to surface strengthening treatment through high-repetition-frequency ultra-short pulse laser, a compact remelting strengthened layer is formed on the surface of the metal protective coating, and the beneficial effects that the surface of the coating is polished and purified, the surface microstructure is regulated and controlled, and grains are refined are achieved; and the surface wear resistance, the high-temperature oxidation resistance and the corrosion resistance of the metal coating are effectively improved.

Description

technical field [0001] The invention relates to the technical field of surface strengthening of metal protective coatings, in particular to a method for strengthening metal protective coatings based on high repetition frequency ultrashort pulse laser. [0002] technical background [0003] Metal protective coatings, such as NiCrAlY, NiCoCrAlY, NiAlHf, are widely used in various high-temperature hot-end components, as well as bonding layer materials in thermal barrier coating systems due to their excellent high-temperature oxidation resistance and corrosion resistance. As a coating preparation technology widely used in industrial production, arc ion plating has attracted more and more attention in the preparation of high temperature protective coatings. The advantages of this technology are mainly reflected in the following aspects: First, the vacuum preparation environment can improve the cleanliness of the coating surface and prevent the coating from being polluted during th...

Claims

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Application Information

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IPC IPC(8): C23C14/32C23C14/58C23C14/14
CPCC23C14/325C23C14/5813C23C14/14
Inventor 钱伟花银群蔡杰
Owner JIANGSU UNIV