|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials for Energy Conversion and Storage
||Chromium Evaporation from Metallic Components and Cathode Poisoning in SOFC
||Ashish Aphale, Md Aman Uddin, Junsung Hong, Justin Webster, Su Jeong Heo, Boxun Hu, Prabhakar Singh
|On-Site Speaker (Planned)
Chromium containing Fe and Ni base alloys are commonly used for the fabrication of SOFC system components (cell to cell interconnect, stack components, BOP sub-systems) as they provide excellent corrosion protection in oxidizing atmosphere under isothermal and thermal cyclic exposure conditions by forming a dense and protective chromia scale. The chromia scale, however, in presence of O2 and H2O becomes prone to evaporation and formation of oxide and hydrated oxide vapor species, leading to interaction with (surface and TPB deposition, compound formation) and rapid degradation of the cathode, phenomena commonly termed as the chromium poisoning. Application of electrically insulating and conducting surface coatings, modifications of cathode and alloy chemistry and gettering is currently used as a means to minimize the Cr evaporation, transport and subsequent interaction. An overview of the chromium evaporation and cathode poisoning will be presented with emphasis on reaction processes at the solid-solid and solid-gas interfaces.