Carbon fiber material and surface cleaning method

With the continuous breakthroughs in manufacturing technology in aerospace, automotive and other fields, the requirements for materials are also developing in the direction of high strength, lightweight and other high performance. Although traditional metal or alloy materials have superior physical and mechanical properties, the advantages are no longer obvious and can not fully meet the needs of the development of new technology. polymer materials such as carbon fiber composites not only have high specific strength, high specific modulus and lightweight properties. And carbon fiber composites have high heat resistance, structural Designability, anti-fatigue, anti-corrosion, anti-vibration and electromagnetic shielding, which are more in line with the needs of industry development.

For example, the box of new energy battery should have the characteristics of electrical insulation, high heat dissipation and chemical stability, and the box is generally composed of upper and lower box and sealing system. The mass of the battery package accounts for 18% to 30% of the mass of the whole vehicle system, while the mass of the box accounts for about 10% to 20% of the total mass of the battery package. at present, metal is widely used as the material of the battery package, and the composite material has been paid more and more attention because of its excellent specific strength. The composites used in the battery box are mainly lightweight materials such as carbon fiber composites, glass fiber reinforced composites and SMC composites. Carbon fiber reinforced composites have the advantages of low density and high strength, so they have been widely used in battery boxes.

In the carbon fiber box, the metal joint is often used at the connection between the box body and the car body, and the joint and the main structure layer of the material are glued and fixed in the way of mixed connection. The mixed connection mode of “mechanical fixation and bonding” can also effectively improve the fatigue strength, torsional stiffness and crashworthiness of light components and car body structures, lighten the weight and make the connection have good stability.

In the process of carbon fiber bonding, it is often necessary to treat the cemented surface, and the surface treatment technology of carbon fiber composites is developing from the traditional treatment to the direction of high efficiency, intelligence and environmental protection. When the laser energy density is lower than the material damage threshold, the laser surface modified carbon fiber material will not cause the change of material surface micro-morphology; when the laser energy density is higher than the material damage threshold, laser can make the material melt, gasify, decompose and remove, resulting in the formation of protuberance, pits, porous-sponge, periodic structure and other micro-morphology on the material surface.

At present, the surface of carbon fiber can be cleaned by laser to increase the bonding ability. Without harming the material, laser cleaning is a suitable cleaning method at present, which is convenient and quick to operate, as long as the parameters are adjusted, there is no damage to the surface of the composite material.

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