Geometry-dependent numerical and experimental investigations in the production of C/C-SiC-composites via LSI-route and injection molding as a molding process.

• Applicants: Professor Dr.-Ing. Andreas Seefried, since 3/2024; Professor Dr.-Ing. Guntram Wagner
• Subject Area: Plastics Engineering ; Polymeric and Biogenic Materials and Derived Composites ; Primary Shaping and Reshaping Technology, Additive Manufacturing
• Term: since 2023
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 522184191

The overall objective of the project is to develop a fundamental understanding of the complex interactions of the 3-step LSI process in the production of short-fiber-reinforced C/C-SiC composites with a focus on shaping through thermoset injection molding. Experimental Investigation of the mold filling behavior of panels of different thicknesses and of a complex component with carbon fiber reinforced thermoset matrix in injection molding serve to explore the process-structure-property relationship as well as its simulative mapping. A sub-objective of the project is the prediction of the fiber orientation as a function of component geometry and processing parameters. Based on this, conclusions are drawn about the predictive accuracy of the mechanical properties of the manufactured components. The fiber orientation that occurs in injection molding currently leads to unpredictable material behavior in the ceramization process and therefore does not allow any conclusions about the properties of the final composite. Particularly for the individual processes of annealing, pyrolysis and silicon infiltration, systematic correlations between the geometry of the molded part, the fiber orientation in the CFRP composite in combination with process parameters and the properties of the C/C and C/C-SiC composites are to be investigated and transferred to new models. The aim is to reliably predict and improve the microstructural and mechanical properties of fiber-reinforced composites. In a last step, the knowledge gained in the main areas of processing, simulation and ceramization will be brought together. The aim is to analyze the effects of component geometry and fiber orientation on shrinkage and warpage properties throughout the entire production chain.

• DFG Programme: Research Grants
• Ehemaliger Antragsteller: Professor Dr.-Ing. Michael Gehde, until 3/2024 (†)