Recovery and reuse of thermosetting carbon fibre reinforced composites

Abstract

With the widespread application of carbon fibre composites in sectors such as automotive, aerospace, and construction, recycling and reusing these materials have become crucial for reducing environmental impact and resource waste. This article summarises the potential of recycled carbon fibres in additive manufacturing by describing the main techniques, tools, and benefits and drawbacks of mechanical, thermal, and chemical recycling of carbon fibre composites. Notably, oxidation in air at 400450C for 15-20 minutes can greatly improve the tensile characteristics of thermally treated carbon fibres, offering promise for thermal recycling. In terms of chemical recycling, using recyclable subcritical and supercritical fluids can improve carbon fibre recovery rates and result in smoother-surfaced, higher-performing fibres. Additionally, recycled carbon fibres show potential in additive manufacturing due to their lightweight, high strength, and high stiffness. The purpose of this study is to accelerate the widespread use of carbon fibre composites across industries by providing an overview of carbon fibre recycling methods. Research and innovation in this field are crucial for sustainability and the circular economy.