Papers by Author: D.H. Kuo

Abstract: Functionally gradient materials (FGMs) composed of 3YSZ and IN713LC were developed in three different configurations. A linear-mode FGM had its compositions with a monotonic change in coefficient of thermal expansion (CTE). Negative- and positive-deviated FGMs had their compositions with lower and higher CTEs, respectively, on the ceramic sides. Fracture behaviors of these three types of FGMs were evaluated with aids of residual stress analyses. FGMs with a positive CTE deviation demonstrated the best performance in the experiment. The brittle ceramic side was under high compressive stress, and high tensile stresses were primarily initiated in the metal-rich gradient layers.

Abstract: The compatibility of various electrolyte and electrode combinations has been assessed based on viewpoints of mechanics. The membrane-electrode assembly (MEA) was mainly comprised of traditional ceramic-metal materials as well as solid electrolytes. Variations of key variables such as size and coefficient of thermal expansion were incorporated into ABAQUS sensitivity analyses. Accordingly, general design rules in manufacturing solid oxide fuel cell (SOFC) were proposed, and these rules were beneficial to produce multilayer MEA in the future.