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

由于所产生的高抗热震性，全球40%以上的防火产品都使用碳来调整其热机械和化学性质。为了开发“更清洁”的防火部件并因此避免碳排放，了解其他材料如何定制以达到类似的抗热震性是至关重要的，即使在当今更高的热震压力下。该项目通过介绍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抗热震性和防止裂纹扩展，从而为此做出了贡献。该项目的主要目标保持不变，即旨在促进更全面地了解热震引起的热破裂动力学和材料降解。损伤演化的模拟对于高温陶瓷等先进材料的设计是至关重要的。特别是为开发具有最佳力学性能的耐火陶瓷提供了合理的工艺参数和材料选择。重点研究了纳米添加剂对低碳陶瓷抗热震性能影响的模拟研究。具体地，将考虑钛酸锆(ZrTiO4)、镁铝尖晶石(MgAl2O4)和渗碳体(Fe3O)对含碳量约10%的产品的微观结构的影响，例如一方面是MgO-C，另一方面是含碳约30%的功能组分(例如Al_2O_3-C)。这两种情况的建模对于理解碳含量对材料在热应力下的行为的影响是重要的。

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.