Comparison of Low Coefficient of Thermal Expansion (CTE) Nickel Alloys Containing 12.5% Chromium
Conference
·
OSTI ID:901546
Research aimed at formulating low CTE nickel-base superalloys for intermediate-temperature solid oxide fuel cells (SOFCs) is reported. Alloys based on the composition Ni-12.5wt % Cr were modified with either W or Mo to lower CTE to on the order of 12.5 x 10-6 C-1. Mn was added to impart the formation of an outer Cr-Mn spinel and thus minimize chromium vaporization in moist environments. Linear variable differential transducer (LVDT) based dilatometer measurements were used to determine the thermal expansion of the alloys in accordance with ASTM standard E-228-85. Characterisation was performed by XRD and EDS and the results compared to thermodynamic predictions. Oxidation tests (in dry and wet air) were conducted at 750 and 800°C. The results were compared to the behavior of a commercial Fe-22Cr (Crofer 22APU) and Ni-22Cr (Haynes 230) alloys. The oxidation resistance of the low CTE-alloys was intermediate between Crofer 22APU and Haynes 230.
- Research Organization:
- Albany Research Center (ARC), Albany, OR
- Sponsoring Organization:
- USDOE - Office of Fossil Energy (FE)
- OSTI ID:
- 901546
- Report Number(s):
- DOE/ARC-2005-015
- Country of Publication:
- United States
- Language:
- English
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