Pulverized Ceramics added with La₂O₃ : Preparation and

Abstract

Currently, many environmental problems are concerned. Therefore a clean, highly efficient power generation method is attracting attention. As a solution to this problem, a solid oxide fuel cell (SOFC) can be cited. LaCoO₃ (LCO) has emerged to be a promising candidate as cathode for SOFC and as oxygen separation membrane. Previous research reported that sintered LCO pulverizes within several weeks to months and it is clear that this self-pulverization phenomenon caused by minutely excessive La₂O₃ inherent in the ceramics. On the other hand, such a phenomenon that ceramics having the strength of about 800 MPa pulverizes is rare. Also, pulverized ceramics expects to use as an intelligence material by controlling well. Therefore, in this research, investigate the pulverization phenomenon in various ceramics materials added La₂O₃ and attempted to control the pulverization phenomenon. The result shows La₂O₃ was the starting point of distraction and the cracks developed from a micro viewpoint. LaAlO₃, LaFeO₃, 3YSZ, 8YSZ added with La₂O₃ pulverized within 15 days.