Materials Evaluation in Supercritical CO2

by Harmon Tunison
Knolls Atomic Power Laboratory

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Screening evaluations were performed on various materials (elastomers, engineering plastics and structural alloys) at both low and high temperatures to assess their performance in supercritical CO2 environments. The low temperature evaluations were performed at 130°F, 9 MPa CO2; while the high temperature evaluations were performed at 825°F and 20 MPa CO2. Materials were evaluated for chemical attack, general corrosion, weight gains, and overall performance. Elastomers and engineering plastics which contained conjugated systems and carbon halide bonds performed worse than material without these chemical functionalities. For structural alloys, increased levels of chrome and/or nickel in an alloy composition contributed to improved corrosion resistance for that alloy.