Initial Assessment of Ni-Base Alloy Performance in 0.1 MPa and Supercritical CO2

B. A. Pint; J. R. Keiser

doi:10.1007/s11837-015-1661-8

Initial Assessment of Ni-Base Alloy Performance in 0.1 MPa and Supercritical CO₂

B. A. Pint, J. R. Keiser

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Abstract

There is considerable interest in increasing the working temperature of both open and closed supercritical CO₂ (sCO₂) cycles to ≥700°C. At these temperatures, it is unlikely that Fe-base alloys have suitable strength and therefore the focus is on Ni-base alloys for this application. To begin addressing the lack of sCO₂ materials compatibility data under these conditions, initial work exposed a wide range of candidate alloys for 500 h at 20 MPa (200 bar) CO₂ at 650–750°C in high-purity CO₂. In general, the reaction products were thin and protective in these exposures. A smaller group of alloy coupons focusing on chromia- and alumina-forming alloys was exposed for 500 h in 0.1 MPa (1 bar) air, CO₂, CO₂ + O₂ and CO₂ + H₂O for comparison. The thin surface oxides formed were very similar to those formed at high pressure and no clear detrimental effect of CO₂ oxidation or O₂ or H₂O impurities could be observed in these exposures.

Original language	English
Pages (from-to)	2615-2620
Number of pages	6
Journal	JOM
Volume	67
Issue number	11
DOIs	https://doi.org/10.1007/s11837-015-1661-8
State	Published - Sep 25 2015

Funding

This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). The research shown was sponsored by the U. S. Department of Energy, Office of Fossil Energy, Office of Coal and Power R&D. M. Howell, M. Stephens, T. Lowe, T. Jordan, R. Brese and D. Leonard assisted with the experimental work. M. P. Brady provided helpful comments on the manuscript.

Funders	Funder number
Office of Coal and Power R&D
U.S. Department of Energy
Office of Fossil Energy

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abstract = "There is considerable interest in increasing the working temperature of both open and closed supercritical CO2 (sCO2) cycles to ≥700°C. At these temperatures, it is unlikely that Fe-base alloys have suitable strength and therefore the focus is on Ni-base alloys for this application. To begin addressing the lack of sCO2 materials compatibility data under these conditions, initial work exposed a wide range of candidate alloys for 500 h at 20 MPa (200 bar) CO2 at 650–750°C in high-purity CO2. In general, the reaction products were thin and protective in these exposures. A smaller group of alloy coupons focusing on chromia- and alumina-forming alloys was exposed for 500 h in 0.1 MPa (1 bar) air, CO2, CO2 + O2 and CO2 + H2O for comparison. The thin surface oxides formed were very similar to those formed at high pressure and no clear detrimental effect of CO2 oxidation or O2 or H2O impurities could be observed in these exposures.",

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AB - There is considerable interest in increasing the working temperature of both open and closed supercritical CO2 (sCO2) cycles to ≥700°C. At these temperatures, it is unlikely that Fe-base alloys have suitable strength and therefore the focus is on Ni-base alloys for this application. To begin addressing the lack of sCO2 materials compatibility data under these conditions, initial work exposed a wide range of candidate alloys for 500 h at 20 MPa (200 bar) CO2 at 650–750°C in high-purity CO2. In general, the reaction products were thin and protective in these exposures. A smaller group of alloy coupons focusing on chromia- and alumina-forming alloys was exposed for 500 h in 0.1 MPa (1 bar) air, CO2, CO2 + O2 and CO2 + H2O for comparison. The thin surface oxides formed were very similar to those formed at high pressure and no clear detrimental effect of CO2 oxidation or O2 or H2O impurities could be observed in these exposures.

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Initial Assessment of Ni-Base Alloy Performance in 0.1 MPa and Supercritical CO₂

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