Effect of thickness and porosity on the mechanical properties of planar components for solid oxide fuel cells at ambient and elevated temperatures
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The effects of specimen thickness and porosity on the elastic moduli, equibiaxial strength, and fracture toughness of planar solid oxide fuel cell components are reported. The tested materials include 8mol% yttria-stabilized zirconia (YSZ) electrolytes, and unreduced NiO/YSZ anodes. The thickness of these components varied between 0.5 and 1.5 mm, while the porosity varied between 6 and 23 % vol. Test specimens were processed by tape casting techniques and inspected by Infrared Imaging and Resonant Ultrasound Spectroscopy (RUS). These non-destructive evaluation techniques revealed the existence of defects, such as delamination. The equibiaxial flexural strength was determined by the ring-on-ring test method (ASTM C1499) while the fracture toughness was determined according to the double-torsion test method. Tests were carried out at ambient and elevated temperatures in air.
author list (cited authors)
Radovic, M., Lara-Curzio, E., Armstrong, B., & Walls, C.