Study of Kinetics of Oxide Scale Formation in air on Nicrofer-6025HT for Clean Coal Energy Delivery and other High Temperature Applications using XPS
EMSL Project ID
38191
Abstract
Oxygen separation membranes for clean coal energy delivery in advanced coal based power plants rely on use of solid state electronic and ionic conductors which operate at temperatures in the range 700-900oC. Nicrofer-6025HT is a nickel based alloy which shows compatibility with such a system and can be used as a manifold material to transport the hot gases into the oxygen separation membranes. The main aim of the project is to develop a braze filler composition which hermetically seals the two materials with sufficient mechanical strength at the said operating temperatures. Brazing relies on surface composition of the two mating surfaces and thus a detailed investigation of the oxide scales on the surface of the Nicrofer is necessary. This proposal calls for studying the oxide scales on Nicrofer in air at different temperatures and for several periods of time using X-ray photoelectron spectroscopy (XPS) electron spectroscopy for chemical analysis (ESCA). XPS sputter depth profiling would help us understand the oxide scales composition and bonding mechanism along with the kinetics of oxide scale growth. The information gained from this study is need for optimization of the Nicrofer oxide scale and engineering the braze alloy compositions necessary for joining Nicrofer to the oxygen separation membrane.
Project Details
Project type
Exploratory Research
Start Date
2009-11-19
End Date
2010-11-21
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
Joshi VV, A Meier, JT Darsell, KS Weil, and ME Bowden. 2013. "Trends in wetting behavior for Ag–CuO braze alloys on Ba0.5Sr0.5Co0.8Fe0.2O(3??) at elevated temperatures in air." Journal of Materials Science 48(20):7153-7161. doi:10.1007/s10853-013-7531-2
Joshi VV, A Meier, JT Darsell, P Nachimuthu, ME Bowden, and KS Weil. 2013. "Short-Term Oxidation Studies on Nicrofer- 6025HT in Air at Elevated Temperatures for Advanced Coal Based Power Plants." Oxidation of Metals 79(3-4):383-404. doi:10.1007/s11085-013-9362-6