SiCN monofilament-reinforced Composite with novel multi-metal matrix on the basis of new cost-effective technologies for high-temperature applications - SiMet

• Applicants: Dr. Günter Motz; Professor Dr. Guillermo Requena
• Subject Area: Glass, Ceramics and Derived Composites ; Metallurgical, Thermal and Thermomechanical Treatment of Materials
• Term: from 2011 to 2017
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 191994244

The intention of the renewal proposal SiCN monofilament-reinforced composite material with new multi-metal matrix based on new affordable technologies for high temperature applications (SiMet) is to continue the holistic approach for the development of a multi-metal matrix composite of the first proposal and to investigate still unsolved research issues. This concerns the preparation of thick SiCN fibres with improved mechanical properties, which requires the development of more flexible green fibers with less defects and a defined diameter but also to increase the pyrolysis temperature up to 1400 °C. According to the reviewer recommendation coating of the fibers is performed by the sub-contracted company TZO GmbH. The favoured coatings are well known for MMC applications (metallic and C-based coatings). The uncoated as well as the coated fibers will be characterized to investigate the influence of the coating on mechanical fiber properties but also to investigate the compatibility between the coating and the fiber as well as with the matrix. The matrix alloys have to adapt to the requirements of the whole system to improve the mechanical properties of the composite. This requires also the investigation of the interface between the primary matrix and the coated fibers. A pressure assisted infiltration process will be developed for a reduction of the pore content. To avoid parasitic brittle phases it is required to adjust the alloy composition of primary and secondary matrix. The composite based on new ceramic fibers and the developed matrix system will be investigated regarding mechanical properties, and finally evaluated with respect to the given requirements.

• DFG Programme: Research Grants