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

There is considerable interest in increasing the working temperature of both open and closed supercritical CO 2 (sCO 2 ) 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 addr...

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Bibliographic Details
Published in:JOM (1989) 2015-11, Vol.67 (11), p.2615-2620
Main Authors: Pint, B. A., Keiser, J. R.
Format: Article
Language:English
Subjects:
Alloys
Alumina
Chemistry/Food Science
corrosion
Earth Sciences
Engineering
Environment
Experiments
MATERIALS SCIENCE
Mechanical properties
Microscopy
Ni-base alloys
Nickel alloys
Physics
Studies
supercritical CO2
Temperature
Temperature effects
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Summary:There is considerable interest in increasing the working temperature of both open and closed supercritical CO 2 (sCO 2 ) 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 sCO 2 materials compatibility data under these conditions, initial work exposed a wide range of candidate alloys for 500 h at 20 MPa (200 bar) CO 2 at 650–750°C in high-purity CO 2 . 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, CO 2 , CO 2  + O 2 and CO 2  + H 2 O for comparison. The thin surface oxides formed were very similar to those formed at high pressure and no clear detrimental effect of CO 2 oxidation or O 2 or H 2 O impurities could be observed in these exposures.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-015-1661-8