Development of Metal-Ceramic Composite Layers with Graded Porosity for Filters and Electrochemical Devices

摘要

Porous membrane structures consisting of a combination of metallic and ceramic layers have many potential advantages and properties compared with conventional materials used in high temperature electrochemical devices and specific filter applications. The metal-ceramic composites can potentially improve functionality, reliability and reduce the manufacturing cost by enabling the use of more economical materials. This work will present a fabrication route based on tape-casting, a cost-efficient and upscalable process, which has been developed to fabricate such composite layers with tailored and graded porosity. By combining metal powder (e.g. ferritic stainless steel) and ceramic powder (e.g. zirconia or SrTiO_3-based materials) the different properties of the materials can be combined and exploited during processing and in the end product. The graded structure can be further modified by infiltration of various nanostructured materials (e.g. catalytically active materials) and/or be combined with a gas-tight ceramic membrane layer in a single co-sintering step.