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

由于抗热震性高，全球40%以上的防火产品都使用碳来调节其热机械和化学性能。为了开发“更清洁”的防火部件，避免碳排放，了解如何定制其他材料，即使在当今更高的热冲击应力下，也能达到类似的耐热冲击性是至关重要的。本项目为此做出了贡献，介绍了如何使用我们最近开发的无网格模拟来研究如何使用纳米级添加剂来优化防火陶瓷的耐热性和防止裂纹扩展。该项目的主要目标保持不变，即它旨在促进对热冲击引起的热断裂动力学和材料降解的更全面理解。损伤演化的建模对于高温陶瓷等先进材料的设计至关重要。特别是，它有助于选择合适的工艺参数和材料，以开发具有最佳机械性能的耐火陶瓷。重点研究了纳米级添加剂对减碳陶瓷抗热震性能的影响。具体而言，将考虑钛酸锆（ZrTiO4）、镁铝尖晶石（MgAl2O4）和渗碳体（fe30o）对碳含量约为10%的产品（如MgO-C）和碳含量约为30%的功能组分（如Al2O3-C）的微观结构的影响。这两种情况的建模对于理解碳含量对材料在热应力作用下的行为的影响具有重要意义。

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.