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At the department of ceramic composite structures at DLR (German Aerospace Center), Institute of Stuctures and Design, ceramic matrix composites (CMC) have been developed since the late 1980s. These materials exhibit damage tolerant fracture behavior, good thermal shock resistance and insensitivity towards cyclic fatigue. So called C/C-SiC materials are manufactured via liquid silicon infiltration (LSI), a robust process based on three characteristic steps: (1) Manufacture of a CFRP preform; (2) Pyrolysis, resulting in a porous C/C preform; (3) Siliconization by capillary infiltration of Si in the C/C preform and chemical reaction of Si with C, building up a SiC matrix. Each step comprises of certain parameters which have influence over the macroscopic properties of the material. The aim of this work is to study the influence of different fibre preforms such as unidirectional layers, woven fabric and wound fabric over the crack evolution in the matrix during the pyrolysis step. Ultimately, the models will be validated with the help of the microscopic images of the microstructure of the material.
The work will comprise:
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Institute of Structures and Design
Phone: +49 711 6862-693