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Applications of plasma cleaning machine in aviation industry

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Published on:

21 Nov,2020

Applications of plasma cleaning machine in aviation industry:

 

Along with the development of the aviation industry, refined production consciousness gradually increase, the need for advanced plasma cleaning machine technology research to replace the traditional solvent cleaning process, so as to further ensure product cleaning effect, indirectly improve the quality of product of life and appearance, at the same time to reduce or avoid solvent volatilization, the harm to human body. By analyzing the principle of plasma cleaning machine, this cleaning method can be extended to the convenience of coating pretreatment of aviation products, surface cleaning of adhesive products and composite material manufacturing.

 

1. Treatment of aluminum alloy skin cover:

 

In aerospace manufacturing industry, the cover is made of aluminum alloy. In order to improve its tightness, the sealing part of the cover is made of NBR vulcanization process. However, after vulcanization, rubber often spills too much rubber, contaminating the surface of the coating, resulting in reduced adhesion of the coating, coating is easy to fall off after being coated. Traditional cleaning methods can not completely remove the pollution caused by the rubber, thus affecting the normal use of the lid. Plasma cleaning before coating, coating adhesion increased significantly, compared with conventional cleaning, more in line with the standard requirements of aviation coating.

 

2. Aerospace electrical connection:

 

The requirements of electrical connectors in aerospace field are very strict. The bonding effect between insulation and wire sealing body without surface treatment is poor. Even if special formula adhesive is used, the bonding effect cannot meet the requirements. In addition, if the bonding between the insulator and the sealer is not tight, electrical leakage may occur, resulting in a reduction in the voltage resistance of the electrical connector. This has seriously affected the development of domestic electrical connectors. Now the domestic specialized production aviation electric connector manufacturer is gradually promoting the application of plasma cleaning machine technology to clean the surface of the connector, through the plasma cleaning, not only can remove the surface of the connector oil, but also can enhance the activity of the surface, so that the connector glue is very uniform, the bonding effect is significantly improved. After being used by several large factories in China, the tension resistance of the electric connectors cleaned by plasma has been doubled and the pressure resistance has been significantly increased.

 

3. Production process of composite materials:

 

The high performance continuous fiber (such as carbon fiber, aramid fiber, PBO fiber, etc.) has strong thermosetting property, but also has the high quality and the high stability thermoplastic resin matrix composite material, has been widely used in the aviation, aerospace, military and other fields, has become the indispensable material. However, this kind of reinforced fiber generally has some disadvantages, such as smooth surface, low chemical activity, difficult to establish physical anchoring and chemical bonding between fiber and resin matrix, and poor interfacial adhesion, which affect the comprehensive performance of composite materials. In addition, there are also organic coatings and dust on the surface of commercial fiber materials. These pollutants mainly come from the preparation, sizing, transportation and storage process of fiber, which will affect the interface bonding performance of composite materials. Before preparation of resin matrix composites, fiber material through processing means, such as plasma cleaning on the surface etching, in removing organic coating and pollutants at the same time, the polarity and reactive group is introduced into the fiber surface, and form some active group, thus further caused by grafting and crosslinking reaction, thus by cleaning, etching, activated, grafting, crosslinking and integrated role to improve the surface state of physical and chemical fiber, so as to achieve the purpose of the interaction of reinforcing fiber and resin matrix.

 

4. Clean the surface of aramid fiber parts:

 

Aramid fiber material has low density, high strength, good toughness, high temperature resistance and easy processing and molding. It is widely used in aviation industry. In some applications, after forming, aramid still needs to bond with other parts, but its material surface is smooth and chemically inert, the surface of its formed parts is not easy to glue. In order to obtain a good bonding effect, it is necessary to carry out surface treatment, and the main surface activation treatment is plasma modification technology. The surface activity of the treated kevlar fiber is enhanced, and the bonding effect is obviously improved. With the continuous optimization of plasma processing parameters, the bonding effect will be further improved, and the application scope will be more and more extensive.

 

In addition, when the aramid fiber composite is finished, its surface must be sealed with epoxy varnish and primer to prevent failure due to moisture absorption. In the process of composite materials production, need stripping treatment on its surface, can be achieved to a smooth separation, parts and mould release agent after processing are still remaining on the surface, can't effectively remove by conventional cleaning method, causes the coating adhesion is poor, coating the phenomenon that falls off easily, affect the normal use of parts. Therefore, plasma cleaning machine technology can be considered to remove the contaminant in the mold release agent economically and effectively.

 

5. Other applications:

 

In aviation manufacturing industry, plasma cleaning machine technology can also be used for the following treatment:

To treat the door and window seals to improve the sealing performance;

The instrument panel shall be treated before painting to prevent the phenomenon of paint dropping;

The control panel is precoated to improve the bonding strength.

Clean the precision parts to remove residual oil contaminants from the processed surfaces.

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