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Institute of Energy and Climate Research

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Ceramic Matrix Composites

Additionally to the TBCs and EBCs activities, we develop also Ceramic Matrix Composites (CMCs) for gas turbine components and/or other systems that operate under high temperature and harsh environmental conditions. The novelty of these composites is that the matrices are based on MAX phases, a novel family of layered materials that bridge the gap between ceramics and metals. Due to their ceramic character, MAX phases present low density, high elastic modulus, and good oxidation and corrosion resistance at high temperature, whereas as their metal character, they exhibit high electric and thermal conductivity, readily machinability, good thermal shock and damage tolerance. As a result, MAX phases are new and potential candidates for high-temperature applications. Among all the MAX phases, we are mainly focused on Cr2AlC, Ti3SiC2, Ti2AlC, and Ti2AlN. Regarding the fibers, short SiC, C, and Al2O3 fibers are used as reinforced phase.

WDS: MAX phase CMC microstructure and MAX phaseMAX phase CMC microstructure and MAX phase

The CMC team has patented a process to synthesize large amount (kilograms) of high pure MAX phases (> 98%) since highly pure powders are not commercially available. Processing of the composites by different techniques (such as infiltration, tape casting, injection molding, additive manufacturing, etc.) and sintering (i.e. by pressureless sintering, HP, FAST/SPS, HIP) are the main activities of the group. Furthermore, the dense monolithic MAX phases, as well as the CMCs, are tested under environmental conditions at high temperature. The group is financially supported by BMBF (“Bundesministerium für Bildung und Forschung”) under the MAXCOM project (03SF0534).