A UK consortium has launched a new family of yarns and fabrics made from recycled carbon fibers that offer properties rivaling those of virgin carbon fibers but cost less.
The six consortium members -- Advanced Composites Group (part of Umeco Composites Structural Materials), Exel Composites UK, NetComposites, Sigmatex, Tilsatec, and the University of Leeds -- debuted the family of materials at the recent Composites Engineering Show in Birmingham.
The materials are the result of the consortium's recently concluded FibreCycle collaborative project, which developed technology for recovering waste carbon fibers, blending them with resins such as PET, and converting them into different types of materials. It recovered carbon fiber from all stages of manufacturing, and it developed reprocessing techniques within a representative supply chain.
Carbon-fiber/PET composites offer 50 percent of the tensile strength and 90 percent to 100 percent of the tensile modulus of an equivalent composite based on virgin fibers.
The new carbon-fiber materials are continuous, highly aligned reinforcements, including yarns, woven textiles, noncrimp fabrics, prepreg tapes, and preconsolidated sheets. Like other commingled and blended materials, the fabrics are molded under pressure and pass through a heating and cooling cycle. Several demonstrator products, including press-molded automotive parts, have been produced. The commercial members of the consortium serve multiple industries, including automotive, aerospace, and industrial.
Composite laminates made from 50 percent recycled carbon and 50 percent recycled PET, measured by weight, can deliver at least 90 percent of the tensile modulus, or stiffness, and 50 percent of the tensile strength of an equivalent composite made from virgin fibers.
"The properties achieved mean that" the materials are "suitable for many applications, especially in the automotive, aerospace, sports and leisure, medical and energy sectors," Dr. Sophie Cozien-Cazuc, FiberCycle project director and collaborative R&T project manager for Umeco Composites Structural Materials, said in a press release. Though these new fibers and fabrics have almost the same stiffness as virgin materials, the carbon-fiber feedstock on which they are based costs less than virgin fibers and fabrics would.