Mikrostruktursimulationen für die systematisch orientierte Entwicklung von thermoschockbeständigen Werkstoffen mit reduziertem Kohlenstoffgehalt

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Due to the resulting high thermal shock resistance, carbon is used in more than 40% of all fire-proof products worldwide to adjust their thermomechanical and chemical properties. For the development of “cleaner” fire-proof parts and the consequential avoidance of carbon, it is essential to understand how other materials can tailored to reach a comparable thermal shock resistance even under today’s higher thermal shock stresses. This project contributes to this by presenting first steps on how to use recently by ourselves developed meshless simulations to study how nanoscale additives can be used to optimize the thermal shock resistance of fire-proof ceramics and prevent crack propagation. The main goal of this project remains unaltered, i.e. it aims to contribute to a more comprehensive understanding of the thermo-fracture dynamics and materials degradation due to thermal shock. The modeling of a damage evolution is crucial for design of advanced materials such as high temperature ceramics. In particular, it helps for a suitable choice of per process parameters and material for the development of refractory ceramics with optimal mechanical properties. The specific focus is on a simulation-based study of impact the nanoscale additives on the thermal shock resistance of ceramics with carbon reduced content. Specifically, the influence of zirconium titanates (ZrTiO4), magnesium aluminum spinel (MgAl2O4) and cementite (Fe3O) on the microstructure in products containing about 10% percent carbon, such as MgO–C one hand, and also functional components with about 30% of carbon,for example Al2O3–C other hand, will be considered. Modeling of both cases are important for understanding influence of carbon content on the behavior of materials under thermal stress.