Date of Completion
high temperature materials, Chromium evaporation, SOFC, metal corrosion, coating, interconnect, BOP, AFA
Dr. Prabhakar Singh
Dr. Frederick S. Pettit
Dr. Harris L. Marcus
Field of Study
Materials Science and Engineering
Doctor of Philosophy
Recent developments of planar intermediate temperature solid oxide fuel cells (IT-SOFCs) make metallic alloys attractive candidates as interconnects as well as balance of plant (BoP) materials at operating temperatures below 900 oC. The resistance of alloys against oxidation and corrosion is one of the critical criteria for selecting candidate alloys for SOFC applications. The oxidation and corrosion resistance of the alloys service at high temperature depends on the formation of a protective oxide scale (chromia. silica, alumina). Among these, chromia forming alloys are often used in SOFCs. At higher temperature, the evaporation of chromium containing species from chromia in humid air limits the applications of chromia forming alloys. SOFCs are susceptible to chromium evaporation (known as chromium poisoning) as it can lead to severe degradation of SOFC performance.
In this study, the transpiration method was used to measure the chromium evaporation rates from chromium evaporation of chromia and alumina forming nickel and iron base alloys. The effects of the temperature and water vapor content on the chromium evaporation rates were also investigated. The measured chromium evaporation rates were used to predict the degradation rates of the SOFCs under those conditions.
The oxidation behavior of candidate alloys in air with different water vapor contents was studied. The effects of the temperature and water vapor content on physicochemical characteristics of the oxide scales formed on the surface of metallic components were also examined.
Ge, Le, "Chromium Evaporation of Metallic Component Materials in Solid Oxide Fuel Cell (SOFC)" (2014). Doctoral Dissertations. 329.