US researchers use laser surface preparation of high-quality carbon fiber, this process is low cost and high flexibility, because the surface layer of material by laser before bonding can improve the contact performance, and for high-volume automated use offers the possibility. According to experts, a few days ago the United States Oak Ridge National Laboratory (ORNL) researchers developed for automotive lightweight carbon fiber composite materials and other materials bonded laser surface treatment is expected to replace the grinding sand, grit blasting and Hand-processed materials surface technology that is environmentally harmful solvents will help provide higher quality carbon fiber.
Sabau, ORNL Fellow and R & D Team Leader, said: "Our technology is far superior to traditional surface preparation methods and this approach adds to the automotive industry's use of this lightweight high-strength material in view of the significant cost savings of carbon fiber polymer composites Applications while reducing the weight of cars and trucks by 750 lb. "The surface treatment of aluminum and carbon fiber polymer composites is a key step in the bonding process and will have a direct impact on the quality of the seams. During the rolling process, the aluminum surface tends to form oil layers and other contaminants, while carbon fiber surfaces often contain many release materials.
"These surface contaminants can affect the surface energy and the bonding quality, so removing them is crucial," explains Sabau. According to experts, in addition, the laser penetrates into the top resin layer, allowing individual carbon fibers to be exposed for direct bonding to the adhesive for higher quality bonding. The joints prepared by laser-structured surfaces absorb about 200% more energy than the conventionally prepared baseline joints. Sabau said the process also doubles the energy absorption of the joint and can therefore be used to crash safety gear and armored vehicles.
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