Nb/Ti Affect SOFC Interconnect Alloy Oxidation Jeffrey W. Fergus, Auburn University, DMR 0551896.
The objective of the project is to understand the oxidation behavior of interconnect materials for solid oxide fuel cells (SOFCs). Improvements in the performance of interconnect materials is important to enable the implementation of SOFCs, which can be used with a variety of fuels, such as gasified coal and reformed biofuels.
The major finding this year was the large difference in the behavior of two similar alloys when exposed to a dual atmosphere (Ar-H2 on one side, air on the other). Alloy 441, which contains small amounts of Nb and Ti, is affected by the dual atmosphere exposure more than Alloy 430. Current work in focused on isolating the effects of Nb additions and grain size on alloy performance.
high flow rate
low flow rate
Dual atmosphere (Ar-H2/air) exposure at 800°C can lead to large nodules and higher growth rates in air for alloy 441, but has little effect for alloy 430.
As part of an associated OISE grant, the PI and two undergraduate students traveled to Indonesia and Singapore. This trip provided a valuable international experience for the students and initiated a research collaboration involving use of neutron diffraction facilities in Indonesia.
The PI is involved in two other projects for broadening participation in STEM. One is a NSF S-STEM program in which 13 scholarships, renewable for up to 4 years, were awarded to students from underrepresented groups. The other is a NSF-REU, which targets students from schools that do not have active research programs.
The PI and two undergraduate students with Indonesian scientists at the Indonesia Institute of Science (LIPI) in Serpong, Indonesia. The trip to Indonesia also included visits to the National Nuclear Energy Agency (BATAN) and the University of Indonesia, where the students presented research they have performed on SOFC interconnect alloys.