Novel approach for ceramic matrix composites - Cf/PEEK hybrid yarn-based C/C-SiC

To fabricate a C/C-SiC (Carbon fiber-reinforced Silicon Carbide) with favorable mechanical properties via the Liquid Silicon Infiltration process, it is crucial to focus on the first fabrication step, the creation of a CFRP (carbon fiber-reinforced plastic). Hence, the selection of a fitting polymer is essential. Besides thermosets, thermoplastics can be used as matrix material. Nevertheless, the high melt viscosity of thermoplastics leads to problems regarding the fiber bundle infiltration. This study shows for the first time that this problem can be avoided by using C/C-SiC based on a novel short fiber Cf/PEEK fiber hybrid yarn. The yarn was warm pressed into a CFRP, pyrolyzed and infiltrated with C/C-SiC. The product of each processing step was characterized with a focus on the analysis of the microstructure. Additionally, for the C/C-SiC, three-point bending tests were conducted. Those results were simular compared to reference literature.

Automated summary

This study solves the problem of high melt viscosity of thermoplastics leading to fiber bundle infiltration by using C/C-SiC based on a novel short fiber Cf/PEEK fiber hybrid yarn. The fabricated C/C-SiC material exhibits favorable mechanical properties.