Reduktion der Stabilisierungszeit bei der Herstellung von PAN-basierten Carbonfasern

  • Reduction of stabilization time in the production of PAN-based carbon fibers

Pursche, Franz Gerhard; Gries, Thomas (Thesis advisor); Pfeifer, Herbert (Thesis advisor)

Düren : Shaker Verlag (2020)
Book, Dissertation / PhD Thesis

In: Textiltechnik/Textile Technology
Page(s)/Article-Nr.: III, 276 Seiten : Illustrationen, Diagramme

Dissertation, RWTH Aachen University, 2019


Despite their outstanding mechanical properties and low weight, carbon fibers are rarely used in mass applications today. One main reason is the high average price of 20 €/kg, which is due to the time-consuming and energy-intensive production process. A bottleneck is the process of thermal stabilization at high temperatures up to 300 °C and long residence times of up to 100 minutes. This process step accounts for more than 25 % of the total production costs. The aim of this thesis is to reduce the stabilization process time to less than 50 minutes. The basic requirement is that no additional investment costs are necessary for the implemention of the development. This minimizes possible market entry barriers. The benchmark for mechanical properties is the standard industrial fiber type Torayca® T300 from Toray Industries, Inc. (Tokyo, Japan) with a breaking stress of 3.5 GPa and a Young’s modulus of 230 GPa. To reduce the stabilization time, process profiles are developed that are adapted to the chemical properties of the precursor material. The manufacturing process is cascaded and optimized step by step. The process parameters temperature, residence time and draw ratio are optimized on every production step. The mechanical properties are maximized by optimizing the carbonization process step. The central result is a minimum stabilization time of 24 minutes with a breaking stress of 4.0 GPa and a Young’s modulus of 235 GPa. The benchmark is exceeded. When implemented, the savings potential in the production process is 4 €/kg. The economic effects are calculated on the basis of the case study off-shore wind energy to 1,240 million €.