The Effect of Manganese Additions on the Reactive Evaporation of Chromium in Ni-Cr Alloys [electronic resource]
Solid Oxide Fuel Cell; Evaporation; Manganese; Chromium.
Saved in:
| Online Access: |
Online Access |
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| Corporate Author: | |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Office of Fossil Energy ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
2004.
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| Subjects: |
| Summary: | Solid Oxide Fuel Cell; Evaporation; Manganese; Chromium. |
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| Abstract: | Chromium is used as an alloy addition in stainless steels and nickel-chromium alloys to form protective chromium oxide scales. Chromium oxide undergoes reactive evaporation in high temperature exposures in the presence of oxygen and/or water vapor. The deposition of gaseous chromium species onto solid oxide fuel cell electrodes can reduce the efficiency of the fuel cell. Manganese additions to the alloy can reduce the activity of chromium in the oxide, either from solid solution replacement of chromium with manganese (at low levels of manganese) or from the formation of manganese-chromium spinels (at high levels of manganese). This reduction in chromium activity leads to a predicted reduction in chromium evaporation by as much as a factor of 35 at 800 C and 55 at 700 C. The results of evaporation loss measurements on nickel-chromium-manganese alloys are compared with the predicted reduction. Quantifying the effects of manganese additions on chromium evaporation should aid alloy development of metallic interconnects and balance-of-plant alloys. |
| Item Description: | Published through the Information Bridge: DOE Scientific and Technical Information. 10/20/2004. "doe/arc-2005-002" ASM Materials Solutions Conference and Exposition, Columbus, OH, Oct. 18-21, 2004 (sponsored by ASM International, Materials Park, OH) No Proceedings volume was published. Alman, David E.; Holcomb, Gordon R. |