Method for modifying metal material surface through dielectric barrier discharge at atmospheric pressure and cold plasma jet

A dielectric barrier discharge and cold plasma technology, applied in the direction of plasma, metal material coating process, electrical components, etc., can solve the problems of difficult preparation, inability to change the surface structure, inconvenient for precise processing, etc., and achieve the concentration of modified areas. , the effect of high modification efficiency and simple operation

Active Publication Date: 2017-06-13
DALIAN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, this method cannot change the surface structure when modifying the surface of the material, resulting in the rapid recovery of the wettability of the modified material surface in a short period of time due to reactions such as desorption and dissociation.
In addition, this method only provides a modification method for superhydrophobic materials and hydrophobic materials, and fails to realize the modification of superoleophobic materials, and it is difficult to prepare devices such as microfluidic chips that can be used for organic droplet manipulation.
The gas used in this method also has certain limitations. Only reactive gases such as nitrogen, oxygen, and air can be used as working gases, and inactive gases (such as helium, argon, etc.) The range is wide, and it is not convenient to accurately process the local area of ​​the material

Method used

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  • Method for modifying metal material surface through dielectric barrier discharge at atmospheric pressure and cold plasma jet
  • Method for modifying metal material surface through dielectric barrier discharge at atmospheric pressure and cold plasma jet
  • Method for modifying metal material surface through dielectric barrier discharge at atmospheric pressure and cold plasma jet

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Embodiment 1

[0035] Surface modification of superoleophobic aluminum sheet by atmospheric pressure dielectric barrier discharge cold plasma jet can significantly improve its surface energy and wettability, and realize the transformation from superoleophobic to superoleophilic. When the voltage is lower, its surface structure is not changed.

[0036] The cold plasma jet generator 4 adopts an insulated quartz glass tube, and the high-voltage electrode 5 is wound on 4 . The high-voltage power supply 6 adopts a sine wave AC power supply with an output frequency of 30-100 kHz and an output voltage of 0-30 kV; the high-voltage output end of the high-voltage power supply 6 is connected to the high-voltage electrode 5 on the cold plasma jet generator 4, and the low-voltage output end is grounded. The gas in the working gas source 1 is high-purity helium. After connecting the equipment, the distance between the outlet of the cold plasma jet generator 4 and the processed metal material 8 (aluminum-...

Embodiment 2

[0038] The surface modification of superoleophobic aluminum sheet was carried out by atmospheric pressure dielectric barrier discharge cold plasma jet to realize the transformation from superoleophobic to superoleophilic. When the voltage is higher, its surface structure can be changed to achieve long-term lyophilic modification.

[0039] The cold plasma jet generator 4 adopts an insulating PTFE (polytetrafluoroethylene) tube, and adopts the high-voltage power supply described in the specific embodiment 1. The connection mode of the jet generator and the high-voltage power supply is the same as that of the specific embodiment 1. Turn on the gas source processing device 2, adjust the gas mass flow controller 3 to make the helium flow reach 3SLM; turn on the high-voltage power supply 6, adjust the output frequency to 56kHz, and gradually increase the output voltage to 30kV. At this time, the dielectric barrier discharge cold plasma jet 7 acts on the surface of the superoleophobi...

Embodiment 3

[0041] Surface modification of superhydrophobic aluminum sheet by atmospheric pressure dielectric barrier discharge cold plasma jet can significantly improve its surface energy and wettability in a short time, and realize the rapid transformation from superhydrophobic to superhydrophilic.

[0042] The cold plasma jet generator 4 adopts an insulating alumina ceramic tube. The high-voltage power supply and its connection with the jet generator are the same as those in the specific embodiment 1, and the operation steps and methods are also the same. As shown in Figure 7, the water contact angle of the superhydrophobic aluminum surface before treatment is about 157°, and after only 1 s treatment, the contact angle becomes 20°, which is hydrophilic. After 3 s of treatment, the contact angle was 0°. It can be seen that this modification method can realize the rapid modification of superhydrophobic aluminum sheets.

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Abstract

The invention provides a method for modifying metal material surface through dielectric barrier discharge at atmospheric pressure and cold plasma jet, and belongs to the technical field of material surface processing. According to the method, through dielectric barrier discharge at atmospheric pressure, a large quantity of active particles are generated to mutually react with the metal material surface, oxidation, etching, cross-linking and other physical and chemical reactions happen, and the metal surface is modified. The cold plasma jet is generated by a cool plasma generator with a charging form being dielectric barrier discharge. When charging voltage is low, the cold plasma jet can conduct lyotropic modification on the metal material surface quickly, and the surface structure of the surface is not changed; when the charging voltage is high, the jet can quickly conduct modification, and change a microstructure of the surface at the same time, and thus the lyotropic modification effect is kept for long. The method for modifying the metal material surface through the dielectric barrier discharge at the atmospheric pressure and the cold plasma jet is high in processing efficiency, free of vacuum equipment, low in cost, simple and flexible in operation and free of pollution to environment, and is a novel green surface modification method.

Description

technical field [0001] The invention relates to a method for surface treatment of metal materials by using atmospheric pressure dielectric barrier discharge to generate cold plasma jets, and belongs to the technical field of material surface treatment. Background technique [0002] With the rapid development of the manufacturing industry, the application fields of metal materials are becoming wider and wider, and different application fields have correspondingly different requirements for the surface properties of materials. Wettability is one of the important characteristics of metal materials. According to different applications, it is of great significance to reasonably control the wettability of the surface of metal materials. At present, the methods for surface modification of materials mainly include wet chemical method, ultraviolet irradiation method, low temperature plasma treatment method, laser treatment, photolithography and so on. Among them, the low temperature...

Claims

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Application Information

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IPC IPC(8): H05H1/24C23F4/00C23C8/36
CPCC23C8/36C23F4/00H05H1/2406
Inventor 刘新刘硕刘吉宇陈发泽宋金龙孙晶
Owner DALIAN UNIV OF TECH
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