Development of Alternative Glass Ceramic Seal for a Planar Solid Oxide Fuel Cell

Abstract

LZSA glass ceramic (LiO2-ZrO2-SiO2-Al2O3) was tested for its thermomechanical compatibility as a sealing material with a stainless steel interconnect (AISI 430) of a planar SOFC. With this purpose, the densification and crystallization behavior of LZSA were investigated initially. It was observed that the material reached maximum relative density and shrinkage, respectively 95% and 17%, at 800°C, which corresponded approximately to the crystallization temperature of the material as evidenced by DTA analysis. In the next step, LZSA tapes were cast from slurries and prepared either as LZSA laminates or LZSA-steel bilayers. The densification behavior and microstructural features of cofired LZSA laminates and LZSA-steel bilayers were analyzed at 800 and 900°C. Maximum relative density and defect-free interfaces were observed for laminates and bi-layers cofired at 800°C, whereas increased porosity and detached bi-layer were the characteristics of the samples fired at 900°C.

The Effect of Commercial Rice Husk Ash Additives on the Porosity, Mechanical Properties, and Microstructure of Alumina Ceramics

“…With a decrease in the relative density, the porosity increased, leading to pore formation. In addition, it can be seen that there is not much difference in the open pore size distribution above 20 wt% rice husk ash due to the presence of the glassy phase, which leads to an increase in the relative density of 52.28% at 30 wt% of rice husk ash and a decrease in the porosity to 47.63%, resulting in little difference in the pore size of the ceramic body [40,41].…”