1109
Oxide Stability in High-Temperature High-Velocity Steam

Monday, 14 May 2018: 11:20
Room 305 (Washington State Convention Center)
E. Opila (University of Virginia)
Recent development of a high-temperature high-velocity steam jet furnace has allowed the rapid evaluation of oxide stability toward formation of gaseous metal hydroxides. Temperature dependent results have been obtained for the formation of the gaseous species Si(OH)4, TiO(OH)2, TaO(OH)3 and Al(OH)3 from their respective binary metal oxides SiO2, TiO2, Ta2O5, and Al2O3 by simple recession measurements. Results are compared to calculated equilibrium partial pressures and available literature data in an effort to establish the relevance of this technique for establishing equilibrium conditions. Challenges for adapting this technique to explore the stability of complex silicates such as Y2Si2O7 in high-temperature high-velocity steam are also described. Finally, the advantages and disadvantages of utilizing the steam jet technique for establishing oxide stability in high-temperature high-velocity steam are summarized.