Madisen McCleary Material Science Doctoral Defense
- Monday, April 15, 2019 at 3:30pm
- Norm Asbjornson Hall, Room 137 - view map
Investigation of the Mechanical Properties of Aluminum Titanate (Al2TiO5) Doped Ni-YSZ Solid Oxide Fuel Cell Anodes
Recently, there has been growing interest in Solid Oxide Fuel Cells (SOFCs) because of their potential as a renewable energy system. In anode supported systems, the anode layer is the thickest and provides mechanical strength in order to avoid catastrophic failure. Nickel-yttria stabilized zirconia (Ni-YSZ) ceramic and metal composites (cermet) are widely used as anode material, but in contrast to the vast amount of data available on their electrochemical properties, little is known about their mechanical performance. This work focuses on the development of a novel anode material by doping of Ni-YSZ with small amounts of aluminum titanate (Al2TiO5, ALT) in the manufacturing process.
It has been highlighted that ALT doping results in a remarkable strength increase (over 50% when compared to undoped material) due to the development of secondary phases during the sintering and reduction processes. Different mechanical testing methodologies used to assess the undoped and doped material mechanical performance will be discussed. Results from complimentary advanced microscopy techniques and Weibull statistical analyses will be presented in order to elucidate how secondary phases influence the material failure mechanisms.
- Department of Mechanical & Industrial Engineering