‘Refractory Composites’ via vibration assisted casting, pressure slip casting and cold isostatic pressing on the base of conventional sintering without pressure

子项目2研究了基于子项目1的预合成颗粒的功能、粗晶耐火复合材料的制造。样品将通过振动辅助浇注、压力注浆浇注和冷等静压产生，粒度分布在1到5000微米之间。浇注料的流变性和流动以及压制块将是颗粒尺寸、粒度分布、颗粒形状、比表面以及它们在室温下变形的能力的函数。在调整特定粒度分布的基础上，还将与科学小组的其他子项目合作，研究细晶和粗晶对力学性能、热机械性能、化学性能和电学性能的影响。将研究以氧化铝为外壳，以金属/陶瓷复合材料为核心的芯/壳-夹层组件。在粗晶的帮助下，烧结过程中的收缩将控制在1%以下，从而在芯子和晶胞之间形成无微裂纹的界面。对于核/壳组件，a)将研究用于能源应用的无硅和无碱混合加热屏蔽体，以及b)将探索用于钢铁工业冶金应用的无碳混合挡板。火焰喷涂涂层可以提高金属/陶瓷复合芯材的抗氧化性。

Subproject 2 investigates the manufacturing of functional, coarse grained, refractory composites bases on the pre-synthesized grains of subproject 1. Samples will be generated via vibration assisted casting, pressure slip casting and cold isostatic pressing with the aid of a wide grain size distribution between 1 and 5000 µm. The rheology and the flowing of the castables as well as of the pressing masses will be a function of grain size, grain size distribution, grain shape, specific surface of the grains as well their ability to get deformed at room temperature. Based on the adjustment of specific grain size distributions the impact of fine and coarse grains on the mechanical, thermomechanical, chemical and electrical properties will be investigated in cooperation also with the other subprojects of the scientific group.Core/Shell-Sandwich components based on alumina on the outer side and metal/ceramic composite as a core material will be studied. With the aid of the coarse grains a shrinkage less than 1% during the sintering process will be aimed, so that a micro crack free interface between the core and the cell will be generated. For core/shell-components a) silica- and alkali-free hybrid heating shields will be investigated for energy applications as well as b) carbon free hybrid stoppers for metallurgical application in the steel industry will be explored. Flame sprayed coatings will improve the oxidation resistance of the metal/ceramic composite core material.