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Wednesday, June 2 • 10:25 - 10:50
Innovative stabilization oven concepts for carbon fiber production based on fiber bundle temperature measurements

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  • Stabilization
  • oven design
  • temperature measurements

Carbon fibers have excellent mechanical properties at a low density. Despite their outstanding strength-to-weight ratio, carbon fibers are not used in low-cost areas due to their high price. The production of carbon fibers is divided into a multi-zone stabilization and a multi-zone carbonization. Due to the high process time of up to 120 min, stabilization represents a significant share of the total cost.
During stabilization, the precursor is thermally converted into a thermoset state at temperatures between 200-300 °C. The stabilization reaction can be described by three exothermic reactions: cyclization, dehydrogenation and oxidation. These reactions mainly depend on the oven temperature and the degree of fiber stabilization. Thus, a fiber that has already been partially stabilized requires a higher temperature than an unstabilized fiber. An optimal stabilization profile is characterized by the fact that as many reactions as possible take place in a short time without fiber overheating and burning uncontrollably due to the exothermic nature of the reactions. Specially developed circulating air ovens are used for stabilization. A stabilization system consists of several ovens arranged behind each other with increasing oven temperature. Current stabilization ovens are especially designed with a view to homogeneous oven temperature distribution. However, the temperature of the fibre is not measured or considered since there is no commercial system for fibre temperature measurement.
The research results show measurements of the fiber temperature in different zones of stabilization. The fiber temperature is significantly higher than the oven temperature due to the exothermic reactions. Furthermore, the reactions do not take place uniformly over the entire stabilization due to the oven design. Thus, the results offer enormous potential for improving the oven design and the safety of industrial scale lines. In order to demonstrate the potential of an adapted oven design, initial tests were carried out and evaluated.

Speakers, Jury Members & Final...
avatar for Felix POHLKEMPER

Felix POHLKEMPER

Researcher, Institut für Textiltechnik of RWTH Aachen University
Felix Pohlkemper was born in Nordhorn, Germany, in 1990. In 2016 he graduated with distinction in mechanical engineering with a focus on automotive engineering and production engineering at RWTH Aachen University. During his studies he was working at the Institute of Textile Technology... Read More →


Wednesday June 2, 2021 10:25 - 10:50 CEST
Conferences (Hall 6 - Room 611)