Researchers innovate advanced method for carbon fiber recycling

Researchers at Waseda University have introduced a groundbreaking direct discharge electrical pulse method for recycling carbon fiber-reinforced polymers (CFRPs). This innovative technique enables the efficient and sustainable separation of CFRPs, recovering high-quality carbon fibers while significantly reducing environmental impact.

CFRPs are widely used in aerospace, automotive, and sports equipment due to their lightweight and high-strength properties. Despite their advantages, recycling CFRPs poses a major challenge, with traditional methods relying on high-temperature or chemical processes that are costly and environmentally harmful. Electrohydraulic fragmentation has been explored as a promising alternative, using shockwave impulses to separate composite materials, but researchers sought a more efficient solution.

Led by Professor Chiharu Tokoro, the Waseda University team developed the direct discharge electrical pulse method, inspired by previous studies on shock wave generation in water. The technique utilizes Joule heating, thermal stress, and plasma expansion to separate materials without the need for heat or chemicals. Compared to electrohydraulic fragmentation, this method achieves superior results, recovering longer, stronger carbon fibers with minimal resin residue and structural degradation.

The new method is also significantly more energy-efficient, improving energy usage by a factor of at least 10 compared to conventional recycling processes. By reducing environmental impact and enabling effective resource recovery, the technology has the potential to transform waste management for industries like aviation, automotive, and renewable energy.

“Our findings have broad applications, from recycling aircraft components to automotive waste and wind turbine blades,” said Professor Tokoro. “This innovation supports sustainability by improving resource utilization and reducing environmental harm, paving the way for a more sustainable future.”