Carbon Fiber-Reinforced Silicon Carbide (C/C-SiC) Fabrication Derived From Polyetherketoneketone (PEKK) as an Alternative Thermoplastic Carbon Precursor

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00008993
URN to cite this document: urn:nbn:de:bvb:703-epub-8993-7

Title data

Moos, Melissa ; Best, Jalena ; Flauder, Stefan ; Nutt, Steve R. ; Langhof, Nico ; Schafföner, Stefan:
Carbon Fiber-Reinforced Silicon Carbide (C/C-SiC) Fabrication Derived From Polyetherketoneketone (PEKK) as an Alternative Thermoplastic Carbon Precursor.
In: Journal of Polymer Science. Vol. 63 (2025) Issue 21 . - pp. 4587-4599.
ISSN 2642-4169
DOI der Verlagsversion: https://doi.org/10.1002/pol.20250057

	Format: PDF Name: Journal of Polymer Science - 2025 - Moos - Carbon Fiber‐Reinforced Silicon Carbide C C‐SiC Fabrication Derived From.pdf Version: Published Version Available under License Creative Commons BY 4.0: Attribution
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Abstract

This study shows the first successful fabrication of a carbon fiber-reinforced silicon carbide (C/C-SiC) via the liquid silicon infiltration process using two thermoplastic polyetherketoneketone (PEKK) powders as carbon precursors. Samples are analyzed after each processing step and compared to polyetheretherketone (PEEK)-derived reference samples. The carbon yield was above 65% for PEKK and 54% for PEEK, possibly due to the greater crosslinking potential of PEKK. Rheological measurements showed a higher melt viscosity of PEKK 60/40 (which consists of 60% terephtalic and 40% isophtalic moieties) than PEEK. The higher viscosity of PEKK 60/40 affected the carbon fiber-reinforced plastic (CFRP) microstructure because it resulted in more matrix pores and some partly saturated fiber tows in the PEKK 60/40-derived CFRP. The incomplete infiltration of fiber tows by PEKK in the CFRP state led to the undesirable reaction of the single carbon fibers during final siliconization. However, the effect was of minor influence, and the microstructure and phase composition remained unaffected. Mechanical testing of PEEK- and PEKK-derived C/C-SiC showed excellently comparable properties with a mean flexural strength above 200?MPa and a strain to failure above 0.55%. Thus, PEKK-derived C/C-SiC is a suitable alternative thermoplastic polymer for C/C-SiC fabrication.

Further data

Item Type:	Article in a journal
Keywords:	mechanical testing; microstructural analysis; PEEK; PEKK; thermoplastic-derived C/C-SiC
DDC Subjects:	500 Science
Institutions of the University:	Faculties > Faculty of Engineering Science > Chair Ceramic Materials > Chair Ceramic Materials - Univ.-Prof. Dr.-Ing. Stefan Schafföner Research Institutions > Central research institutes > Bayreuth Center for Material Science and Engineering - BayMAT Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI) Faculties Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Ceramic Materials Research Institutions Research Institutions > Central research institutes Research Institutions > Affiliated Institutes
Language:	English
Originates at UBT:	Yes
URN:	urn:nbn:de:bvb:703-epub-8993-7
Date Deposited:	17 Mar 2026 09:40
Last Modified:	17 Mar 2026 09:41
URI:	https://epub.uni-bayreuth.de/id/eprint/8993

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