Laminated Multilayer for Thermal Shock Resistant Refractories Based on the Material System Calcium-Aluminate

摘要

At the Fraunhofer Institute for Ceramic Technologies and Systems the principle of manufacturing of carbon-free refractory components by multilayer technology is investigated. Two different material systems are under investigation: Ca-aluminate/A1_2O_3 and Mg0-stabilized Zr_2. The man-ufacturing of multilayer composites by aqueous ceramic tape technology allows the production of components with large dimensions and gradient structures regarding porosity and phase composition, which yield to im-proved thermal shock properties of the materials. This paper presents the results of different characterization techniques for laminated and sintered multilayer as well as the orientation of pore formers inside the green tapes. The microstructure of the sintered multilayer and the interfaces between the tapes is characterized by scanning electron microscopy (SEM) on cross-sections. Tensile tests show the mechanical strength of the different laminates. Computer tomography allows looking for possible delaminations between the different tapes after the lamination, which can cause big defects in the sintered multilayer.