| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
High Temperature Corrosion and Degradation of Structural Materials
|
| Presentation Title |
Exploring Materials Options for sCO2 Applications: Steels to Cermets |
| Author(s) |
Bruce A. Pint, Rishi Pillai, James R. Keiser |
| On-Site Speaker (Planned) |
Bruce A. Pint |
| Abstract Scope |
Supercritical CO2 (sCO2) is being explored for a wide range of applications from fossil to solar energy. Recent work showed that Ni-based alloys and advanced austenitic steels are compatible with sCO2 at 750°C for 10 kh. For sCO2 cycles to be cost competitive, conventional steels are needed at 450°-650°C. Post-exposure room-temperature ductility is being used as a metric for evaluating compatibility of 9-12%Cr steels and type 316 stainless steels at these temperatures. Recent efforts also have explored revolutionary cycles at up to 1200°C. Subcritical exposures at 1 and 20 bar CO2 found most materials except CVD SiC were rapidly attacked at 1200°C including FeCrAl. NiCrAl-type alloys and other SiO2-forming materials, MoSi2 and MoSiAl, were explored at 1000°C but reaction rates were higher than expected. Traditional cermet matrix candidates, Mo and W, were rapidly attacked under these conditions. Research sponsored by the US DOE, Office of Fossil Energy, Crosscutting Research Program |