| 초록 |
Room temperature aerosol deposition is a novel technique to form a thick ceramic film with high density and nanocrystalline structure at room temperature. Submicron ceramic particles are accelerated by gas flow in the nozzle up to velocity of several hundred m/s. During interaction with substrate, these particles formed thick, dense, uniform and hard ceramics layers. In this study, (Ca, Co)-doped LaCrO3 (LCCC) was deposited onto a NiO-YSZ anode by room temperature aerosol deposition for SOFC interconnect. The LCCC interconnect layer consisted of nanocrystalline grains 20-50nm which was formed by the fragmentation and embedment of a high energetic particle into depositing surface. However, the as-deposited LCCC layer contained also nano-scale defects such as inter-particle boundary and the result of gas tightness was not satisfied the SOFC-interconnect requirement. Subsequent heat treatment at 1200oC effectively eliminated the nano-sized defects, resulting in desirable gas tightness. The electrical conductivity of LCCC coating reached up to ~50 S/cm in air environment and ~3.5 S/cm in H2 reduction environment at 750oC. |
