Thermo-oxidative crosslinking of carbon fiber reinforced PEEK (Polyetheretherketone) for additive manufactured ceramic matrix composites

Titelangaben

Freudenberg, Wolfgang ; Wich, Felix ; Best, Jalena ; Moukhina, Elena ; Scherzer, Tim ; Ruckdäschel, Holger ; Langhof, Nico ; Schafföner, Stefan:
Thermo-oxidative crosslinking of carbon fiber reinforced PEEK (Polyetheretherketone) for additive manufactured ceramic matrix composites.
In: Advanced Manufacturing : Polymer & Composites Science. Bd. 10 (2024) Heft 1 . - 2387422.
ISSN 2055-0359
DOI: https://doi.org/10.1080/20550340.2024.2387422

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Abstract

Carbon fiber reinforced polyetheretherketone (CF PEEK)1 samples were fabricated using material extrusion. These additive manufactured green bodies are later processed to their final application as ceramic matrix composites (CMC)² by the liquid silicon infiltration (LSI)³ route. Past studies revealed that the application of material extrusion for the fabrication of CMC requires an additional stabilization-step after 3D-printing in order to prevent the remelting of CF PEEK during the high temperature process of pyrolysis. The thermally induced crosslinking of the CF-PEEK parts ensured shape accuracy and avoided remelting during the pyrolysis afterwards but is limited by the melting temperature of PEEK (Tm ~ 343 °C). On the other hand, a certain temperature must be reached to initiate the reaction mechanism of the CF PEEK. Besides the final thermal annealing temperature, the crosslinking is also affected by time. Based on the analytical results from differential scanning calorimetry (DSC)4, a kinetic model was proposed in the temperature range of 315 °C – 335 °C, and an annealing time of 6 h – 48 h was deduced. Rheological and shape stability investigations of thermally annealed specimens verified the analytic results.