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Applications of plasma cleaning machine in aviation industry

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

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Glass plasma surface treatment

Glass plasma surface treatment

Glass has been used as a material for centuries. Due to the chemical inertia of the glass and its stable properties under the influence of the environment, the glass substrates are cleaned and dried by conventional cleaning methods, so it is difficult to completely remove the foreign bodies adsorbed on the surface. In addition, the surface will be exposed to the air during transportation and handling, which will inevitably adsorb the ambient gas, water vapor and particles. If left untreated, it will lead to insufficient binding force between the film layer and the substrate, resulting in pinholes and particles. After being cleaned and treated by plasma surface treatment machine, the glass material can enter into the next process immediately. Therefore, plasma surface treatment of glass is a stable and effective process.   Plasma surface treatment machine modification, the processing technology of glass has simple equipment, low raw material consumption, low cost, high value-added products, glass coating, adhesive, membrane process was optimized, the low temperature plasma surface treatment machine modified material has been widely used in capacitive, resistive touch screen mobile phone, such as some need to finish machining of glass. After plasma treatment, the glass can reach a point of 72 dyne or even higher, and the water drop Angle can be reduced to less than 10 degrees. It solves the difficulties of glass bonding, printing, electroplating and other problems.   In the plasma, as the glass substrate is bombarded by the charged energy particles (electrons) in the plasma, the ambient gas, water vapor and dirt adsorbed on the surface of the substrate are first bombarded to activate them, make the surface clean and improve the surface energy. When the substrate is deposited, the film atoms or molecules are immersed in the surface to increase van der Waals force. The second is that the surface of the glass substrate is impacted by the charge particles (electrons). Under such impact, many pits and pores will be formed on the surface of the glass substrate. In the deposition process, atoms or molecules in the film enter into these grooves and pores, thus generating mechanical locking force. In addition, the coarsening of the substrate surface increases the actual surface area, which is beneficial for increasing van der Waals forces (intermolecular forces), diffused adhesion, and electrostatic adhesion, thus increasing the total adhesion.   After plasma surface treatment of glass, the surface of the substrate can be cleaned and activated, and the surface can be improved. It can not only effectively remove the environmental gas molecules, water vapor and pollutants adsorbed on the substrate, but also form a clean and activated micro rough surface on the surface of the substrate, and avoid secondary pollution.

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Plasma cleaning machine Earphone cleaning

Plasma cleaning machine Earphone cleaning

The coil in the earphone constantly drives the diaphragm to vibrate through the signal current. The bonding effect between the coil, diaphragm, diaphragm and ear case directly affects the sound effect and service life of the earphone. If they are separated from each other, the sound will be broken, seriously affecting the sound effect and service life of the earphone.   The thickness of the diaphragm is very thin. To improve the bonding effect of the diaphragm, chemical treatment has a direct impact on the material of the diaphragm, thus affecting the effect of the diaphragm. Therefore, many manufacturers are using a new process of diaphragm processing, plasma cleaning machine surface treatment technology is one of them, plasma cleaning machine processing technology can effectively improve the bonding effect, meet the demand, and diaphragm materials will not change. Through the test, the plasma cleaning machine is used to process the earphone, the bonding effect between the components is obviously improved, in the long time of high pitch test will not appear broken and so on, the service life is greatly improved.   Using plasma cleaning technology, on the one hand, can make the electroacoustic device in the process of dispensing encapsulation process covering surface roughness, increase the coating surface roughness, improving coating on the surface of the binding energy, greatly improve its hydrophilicity, favorable to the flow of adhesive solution and smooth, improve the bonding effect, reduce the formation of air bubbles in the process of adhesive is good for wire, solder joint and substrate, the joint between the, on the other hand, in the tin wire welding process at the same time for physical and chemical reaction, plasma cleaning machine can effectively eliminate many times during the curing reaction of baking surface oxidation and organic pollutants, improve the bonding force of tin wire welding line, Increase the welding strength between lead, solder joint and substrate, thus improving yield and production efficiency.   Plasma cleaning machine technology has a thorough stripping cleaning, no pollution, no residue and other characteristics, compared with the wet chemical cleaning, not only can reduce the production cost of enterprises, improve production efficiency, and can effectively use green resources, is conducive to environmental ecological construction.

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Functions and USES of plasma cleaning machine

Functions and USES of plasma cleaning machine

As its name suggests, the plasma cleaning machine is a cleaning equipment, if only from the literal meaning of understanding the plasma cleaning machine function will be a bit one-sided. Because the plasma cleaning machine can not only clean the surface cleaning role, but also a series of applications such as surface modification activation. When it comes to the role of the plasma cleaning machine, can not say magic plasma, it is no exaggeration to say that the role of the plasma cleaning machine can be said to be the role of the plasma.   To clearly understand the function and purpose of the plasma cleaning machine, we must begin by understanding the plasma. So, what is a plasma? Plasma is a state of matter, we know that the state is usually solid, liquid, gas, but in some special cases, can also be a fourth state, such as the surface of the sun, and the earth's atmosphere in the ionosphere material. This state is called the plasma state, or the fourth state of matter.   The following substances are present in plasma: high-speed electrons, excited neutral atoms, molecules, and atomic groups (free radicals); Ionized atoms, molecules, and molecules dissociated by ultraviolet light; An unreacted molecule, atom, etc., but a matter as a whole remains electrically neutral.   The plasma cleaning mechanism mainly relies on the "activation" of the active particles in the plasma to remove the surface stains. In terms of mechanism, plasma cleaning generally includes the following processes: excitation of inorganic gases into plasma; Adsorb the gaseous phase to the solid surface; The adsorption group reacts with the solid surface molecule to form the product molecule. The molecule of the product is resolved into the gas phase. Get the reaction residue off the surface.   The general functions of plasma cleaning machine are as follows: 1. Plasma surface activation/cleaning; 2. Improved bonding ability after plasma treatment; 3. Plasma etching/activation; 4. Plasma rubber removal; 5. Plasma coating (hydrophilic and hydrophobic); 6. Strengthen the state character; 7. Plasma coating; 8. Plasma surface modification, etc.

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Influence of H2 on methane conversion reaction under plasma action

Influence of H2 on methane conversion reaction under plasma action

In the reaction of methane conversion by dc discharge plasma at atmospheric pressure, the amount of H2 added has an influence on the conversion rate of methane, the selectivity of C2 hydrocarbons and the yield of C2 hydrocarbons. With the increase of the amount of H2 added, XCH4, SC2 and YC2 all show an upward trend. When the addition of hydrogen is 80%, XCH4 is 55.1%, YC2 is 42.4%, and SC2 is 82.7%. Spectrum analysis results show that, with H2, with the increase of adding amount of spectral peak intensity H and C2 species increased, analysis the reason may be the H2 cracking generates a large amount of hydrogen plasma activity, active hydrogen atom inelastic collision with methane, prompting generate methane dissociation CHx (x = 1 ~ 3), therefore the conversion of methane is gradually increasing.   At the same time, the spectrum peak strength of CH also gradually increased, indicating that with the increase of the amount of H2 added, the amount of CH generated by methane dissociation increased, and the free radical coupling generated C2 hydrocarbon, so the yield of C2 hydrocarbon increased gradually. In addition, the spectral line strength of C remained basically unchanged, while the selectivity of C2 hydrocarbons in the reaction increased. The analysis was attributed to the fact that the presence of a large number of active hydrogen atoms in plasma inhibited the decomposition and dehydrogenation of C2 hydrocarbons, and the C generated in the reaction system was reduced to CH free radicals, which were coupled to generate C2 hydrocarbons, thereby reducing carbon deposition. The reduction of carbon deposition on the reactor wall and electrode was also observed during the experiment.

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Does plasma cleaning work on blind hole

Does plasma cleaning work on blind hole

Due to the small aperture of THE HDI plate, the traditional chemical cleaning process cannot meet the cleaning requirements for the blind hole structure, and the liquid surface tension makes it difficult for the liquid to penetrate into the hole, especially when the laser is drilled into the microblind hole, its reliability is poor. At present, the technology used for microburied blind hole cleaning is mainly ultrasonic cleaning and plasma cleaning of plasma cleaning machine. Ultrasonic cleaning is mainly to achieve the purpose of cleaning according to the bubble effect, belongs to wet treatment, cleaning time is longer, and depends on the cleaning fluid decontution performance, increasing the difficulty of disposing waste liquid.   At present widely used technology is the plasma cleaning machine plasma cleaning process, the plasma treatment process is simple, environmental protection, cleaning effect is obvious, for the blind hole structure is very effective. Plasma cleaning refers to the gas-solid chemical reaction of highly activated plasma with the borehole dirt on the borehole wall through directional motion under the action of electric field, and at the same time, some unreacted gas and particles are discharged through the air pump.   When cleaning the HDI plate blind hole, the plasma is generally divided into three stages. In the initial stage, the plasma is produced with high purity N2, while the printed plate is preheated, so that the polymer material is in a certain activated state. In the second stage, O2 and CF4 are used as the original gas. After mixing, O and F plasma is generated, which reacts with acrylic acid, PI, FR4 and glass fiber to achieve the purpose of cleaning drilling and fouling. In the third stage, O2 is used as the original gas, and the generated plasma and reaction residue make the hole wall clean.   In addition to plasma chemical reaction, the cleaning process of plasma cleaning machine also has physical reaction with material surface. Plasma particles can shoot down atoms on the surface of the material, or knock atoms off the surface of the material, which is conducive to cleaning the etching reaction. With the development of materials and technology, the structure of buried blind hole will become more and more miniaturized and refined. It will be more and more difficult to electroplate fill the blind hole with traditional chemical degumming method, but plasma-treated degumming method can overcome the shortcomings of wet degumming method, and achieve good cleaning of the blind hole and small hole, so as to ensure a good effect in the electroplating fill process of burying the blind hole.   Plasma cleaning machine cleaning is a dry cleaning, mainly depends on the active ion in the plasma "activation" to remove the object surface stains. This treatment can also be applied to the cell, can effectively remove the cell pole pole end face of dirt, dust, etc., for the battery welding in advance to prepare, to reduce welding defects.

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