HIGH-TEMPERATURE MECHANICAL-PROPERTIES OF LA1-XSRXCR1-YCOYO3 FOR SOFCINTERCONNECT

Solid oxide fuel cells (SOFC) require an interconnect for fabrication into stacked cells. Th is is typically ta(Sr, Ca)CrO3, of which much d ata on the electrical and physical properties already exists. However, very little information exists on the high temperature mechanical pro perties of the material, which is a necessity for future design improv ements. La1-xSrxCr1-yCoyO3 samples were fabricated into green dry-pres sed bars a nd pellets, and sintered under various heating and cooling regimes. The sinterability and high temperature mechanical properties of the material was then investigated as a function of the dopant conc entration. It was observed, for example, that the modulus of rupture o f the dry pressed La0.7Sr0.3Cr1-yCoyO3 (y greater than or equal to 0.3 ) gave a value of over 110 MPa at 1000 degrees C. This paper will prov ide data on the high temperature mechanical properties of the material and its application to the SOFC system.