‘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研究基于子项目1的预合成颗粒的功能性粗颗粒耐火复合材料的制造。样品将通过振动辅助铸造、压力粉浆铸造和冷等静压成型，并借助1至5000 µm之间的宽粒度分布。浇注料以及压制料的流变性和流动性将是颗粒尺寸、颗粒尺寸分布、颗粒形状、颗粒的比表面积以及它们在室温下变形的能力的函数。通过调整特定的晶粒尺寸分布，研究细晶粒和粗晶粒对机械、热机械、化学和电学性能的影响，并与科学小组的其他子项目合作。将研究以氧化铝为外层材料、以金属/陶瓷复合材料为芯材的芯/壳-夹层结构部件。借助于粗晶粒，烧结过程中的收缩率将小于1%，从而在芯和电池之间产生无微裂纹的界面。对于芯/壳组件，a）将研究用于能源应用的无硅和无碱混合加热屏，以及B）将探索用于钢铁工业冶金应用的无碳混合塞棒。火焰喷涂涂层将提高金属/陶瓷复合芯材的抗氧化性能。

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.