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Plasma cleaning of composite materials to improve the surface bonding performance

Plasma cleaning of composite materials to improve the surface bonding performance

Since the emergence of plasma cleaning technology, its application has been increasingly extensive with the rapid development of electronics and other industries. At present, plasma cleaning has been widely used in semiconductor and optoelectronic industry, and has been widely promoted in many technical fields such as automobile, aerospace, medical treatment, decoration and so on. In recent years, plasma cleaning technology has been widely used in polymer surface activation, electronic device manufacturing, plastic bonding treatment, improvement of biocompatibility, prevention of biological contamination, microwave control, precision machinery parts cleaning and other fields. To improve the bonding performance of the composite material surface: Continuous fibers such as carbon fiber and aramid fiber are characterized by light weight, high strength, excellent thermal stability and fatigue resistance. The products used to enhance thermosetting and thermoplastic resin matrix composites have been widely used in aircraft, automobiles, sports, electrical appliances and other fields. But commercial fibrous materials usually have an organic coating on their surface, which is used to make composites. The weak interfacial layer is formed during the processing process, which seriously affects the interfacial bond between resin and fiber. Therefore, before preparing the composite material, it is necessary to remove it by certain treatment means. Plasma cleaning technology can effectively avoid the damage of chemical solvents to the properties of the material itself, introduce a variety of active functional groups to the surface of the material, increase the surface roughness, improve the surface free energy of the fiber, effectively strengthen the interface between the resin and fiber, and improve the comprehensive properties of the composite material. The interlaminar shear strength of aramid fiber was compared by solvent and plasma washing methods. The results show that the plasma washing method can improve the interfacial properties of the composites more obviously under better conditions.

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Plasma cleaning technology to improve the manufacturing process performance of composites

Plasma cleaning technology to improve the manufacturing process performance of composites

The liquid molding technology of composite materials mainly includes resin transfer mold (RTM), vacuum assisted resin transfer mold (VARTM), vacuum assisted resin injection mold (VARI) and resin film penetration mold (RFI). The common characteristic of this process is that the fiber preformed body is put into the mold cavity, and then the liquid resin is injected under the action of pressure, so that it is fully impregnated with the fiber, and then through curing, demoulding and other processes, the required products are produced with less investment, high efficiency and good quality. However, the problem to be solved is that in LCM process, there are a large number of resins that are not ideal for fiber impregnation, and there are holes in the product and dry spots on the surface. It is indicated that the wetting property of resin on fiber surface will directly affect the molding process and product properties of LCM. May be considered by plasma cleaning technology to improve the physical and chemical properties of fiber surface, improve the preforming of the fiber surface free energy in the body, make the resin in the same process conditions (pressure field, temperature field, etc.) can more fully impregnated fiber surface, improve the dipping uniformity, improves performance of the composite material liquid molding process.

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Plasma surface treatment technology to improve the surface coating performance of composite materials

Plasma surface treatment technology to improve the surface coating performance of composite materials

In the molding process, need to use release agent, to ensure that it can be effectively separated from the mold after curing molding, but the use of release agent will inevitably make the patch surface residual too much release agent, resulting in pollution, weak interface layer, so that the coating is easy to fall off. The conventional cleaning method is to wipe with acetone and other organic solvents or remove the residual release agent after grinding. These release agents remain on the surface of composite material products. However, these two methods not only introduce the use of organic solvents, but also produce a lot of dust pollution in the grinding process, which has a serious impact on the environment and also endangers the personal safety of the operator. By plasma surface treatment technology of green cleaning, the composite coating has reached the better conditions for the coating, coating to improve reliability, effectively avoid the defects such as peeling coating, problems, coating surface smooth, continuous, no flow mark, porosity and other defects, compared with the conventional cleaning, coating adhesion obviously improved after plasma surface treatment, through the GB/T9286 test results of grade 1, satisfies the requirement of engineering application.

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Plasma technology to improve the bonding properties of multiple components of composite materials

Plasma technology to improve the bonding properties of multiple components of composite materials

In certain applications, it is necessary to connect multiple composite parts into a whole through adhesive bonding process. In this process, it is difficult to complete the bonding process between composite parts by adhesive coating, because the surface of the composite material has dirt, is smooth or is chemically inert. Using the method of physical grinding, the surface roughness of the composite parts is increased, so as to improve the bonding performance between the composite parts. However, this method is difficult to achieve the purpose of uniformly increasing the surface roughness of the parts while producing dust pollution to the environment, which is easy to cause the deformation and damage of the surface of the composite parts, and then affect the performance of the adhesive interface of the parts. Therefore, the simple and easily controlled plasma technology can be considered to effectively clean the surface contaminants of composite material products, and improve the surface physical and chemical properties, so as to achieve a good bonding effect. Application of plasma cleaning technology to clean composite material, whether it is used to improve the interface of the composite performance, improve the wettability on the surface of the liquid molding process of the fibers in the resin to, or used to clean up the dirt layer on the surface of the parts, to improve the coating performance, or to improve the bonding performance between multiple parts, its reliability mainly depends on the low temperature plasma on the improvement of material surface physical and chemical properties, or used to remove the weak interface layer, or used to increase the roughness, improve the chemical activity, thus improve the infiltration and bonding performance between the two surfaces. With the growing maturity of low-temperature plasma technology and the development of cleaning equipment, especially atmospheric on-line continuous plasma equipment, the cleaning cost is constantly reduced and the cleaning efficiency is further improved. Plasma cleaning technology itself has the advantages of convenient processing of various materials, green and environmental protection. With the gradual improvement of people's understanding of fine production, the application of advanced cleaning technology in the field of composite materials will be widely promoted.

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Application of Medical Plasma Cleaning Machine on PEEK Biomaterials

Application of Medical Plasma Cleaning Machine on PEEK Biomaterials

PEEK, as the main component of polyether ether ketone, has been widely used in medical nonmetallic implant materials due to its good biocompatibility, dimensional stability and elastic modulus between cortical bone and cancellous bone. Such as human skeleton, spinal implant, wound repair, temporary stents in oral medicine, healing caps, occlusal rods in orthodontic applications, etc. Without the surface treatment process of medical plasma cleaning machine, PEEK material is difficult to be widely used in the biomedical field. Next, we will discuss the application of medical plasma cleaning machine in bipeek material processing. 1. Necessity of ionization of biomedical PEEK materials. Due to the low surface energy and hydrophobic property of PEEK material, the interface bonding force is low when it is combined with the composite resin, which affects the bonding property of the material. Therefore, it is usually necessary to adopt certain treatment technology to improve the surface property of PEEK material. The treatment of concentrated sulfuric acid and silicon coating can effectively improve the binding strength of PEEK material and resin, but this treatment method is not suitable for clinical application. Plasma cleaning machine is used to treat PEEK material, which can not only effectively improve the binding strength, but also meet the requirements of clinical application. 2. Corrosion and coarsening effect of medical plasma cleaning machine on PEEK material treatment. When PEEK material is processed by plasma cleaning machine, particles in the plasma will collide with PEEK material, resulting in sputtering corrosion, and chemical active substances in the plasma will also produce chemical etching on its surface. Due to different corrosion rates, the PEEK material surface will produce small concave and convex, and the corroded material in the plasma will be excited and decomposed into gas components, and reverse diffusion to the material surface. At the same time of erosion and repolymerization, PEEK material surface will produce a large number of protrusions, which make the surface rough, increase the contact area of the bond, improve the bond performance, improve product quality, and ensure the safety and reliability of clinical use of medical devices. 3. Medical plasma cleaning machine improves the hydrophilicity and biocompatibility of PEEK material. Plasma cleaning machine is used to treat PEEK material with inactive chemical properties and poor surface hydrophilicity. Many physical and chemical changes can take place on the surface of PEEK material. In addition to erosion, dense correlation layer can be formed on the surface of PEEK material, and polar groups can be introduced on the surface of the material to improve the hydrophilicity and biocompatibility of PEEK material. In a word, treating PEEK and its composites with medical plasma cleaning machine is an effective way to improve the adhesion performance of PEEK. In addition, due to the different hardness of different materials, the surface treatment of PEEK material can obtain different etching effect and roughness. Therefore, in order to obtain the ideal bonding strength and hydrophilic effect, the processing parameters of the plasma cleaning machine need to be adjusted according to the actual situation.

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What are the collisions between particles in the plasma cleaning machine

What are the collisions between particles in the plasma cleaning machine

The plasma produced by the plasma cleaner contains a variety of different particles, whose motion rules determine the properties of the plasma environment. Today we will discuss the types of particle collisions. The collision between particles in plasma can be roughly divided into two kinds: elastic collision and inelastic collision. 1. Elastic collision. In the process of plasma collision, the momentum and total kinetic energy of particles are conserved, and the internal energy of the particles involved in the collision remains unchanged. No new particles or photons are generated, but the velocity of the particles will be changed, and the conversion of momentum and kinetic energy will take place. This kind of collision is called elastic collision. 2. Inelastic collision. In the collision process of plasma, the total momentum of particles is conserved, the total kinetic energy is not conserved, and the internal energy of at least one particle changes, such as the companion of new particles and the companion of photons. This kind of collision is called inelastic collision. Because the internal energy of the plasma particle in the plasma cleaning machine changes, the state of the particle will also change, sometimes accompanied by radiation, and even produce new particles, such as the excitation, ionization and fusion process in the plasma. The following table lists the types of inelastic collisions. In the inelastic collision between electrons and atoms, the kinetic energy of electrons can be converted into the internal energy of atoms with high efficiency, and the energy can be completely converted when the energy is high. In an inelastic collision between an ion and an atom, the electron's kinetic energy is low, and at high levels it is only half of its energy. Therefore, as long as the energy of the electron in the plasma cleaning machine is greater than the excitation energy and ionization energy of the atom, the atom is likely to be excited or ionized, and the ion must have twice the excitation energy or ionization energy of the atom, it can be excited or ionized. In fact, when the energy of the ion in the plasma cleaner is several times that of the ionization energy, the probability of inelastic collision is still very small. Only when the ion speed is the same as the electron speed, the probability of inelastic collision can be compared with that of the electron.

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