Computer Science – Performance
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..504.1391k&link_type=abstract
SPACE TECHNOLOGY AND APPLICATIONS INTERNATIONAL FORUM - 2000. AIP Conference Proceedings, Volume 504, pp. 1391-1401 (2000).
Computer Science
Performance
Thermoelectric, Electrogasdynamic And Other Direct Energy Conversion, Performance Characteristics Of Energy Conversion Systems, Figure Of Merit, Ceramics And Refractories, Metals, Semimetals, And Alloys
Scientific paper
Recently, refractory alloys have been considered as structural materials for vapor-anode Alkali Metal Thermal-to-Electric Conversion (AMTEC) cells, for extended (7-15 years) space missions. This paper reviewed the existing database for refractory metals and alloys of potential use as structural materials for vapor-anode sodium AMTEC cells. In addition to requiring that the vapor pressure of the material be below 10-9 torr (133 nPa) at a typical hot side temperature of 1200 K, other screening considerations were: (a) low thermal conductivity, low thermal radiation emissivity, and low linear thermal expansion coefficient; (b) low ductile-to-brittle transition temperature, high yield and rupture strengths and high strength-to-density ratio; and (c) good compatibility with the sodium AMTEC operating environment, including high corrosion resistance to sodium in both the liquid and vapor phases. Nb-1Zr (niobium-1% zirconium) alloy is recommended for the hot end structures of the cell. The niobium alloy C-103, which contains the oxygen gettering elements zirconium and hafnium as well as titanium, is recommended for the colder cell structure. This alloy is stronger and less thermally conductive than Nb-1Zr, and its use in the cell wall reduces parasitic heat losses by conduction to the condenser. The molybdenum alloy Mo-44.5Re (molybdenum-44.5% rhenium) is also recommended as a possible alternative for both structures if known problems with oxygen pick up and embrittlement of the niobium alloys proves to be intractable. .
El-Genk Mohamed S.
King Jeffrey C.
No associations
LandOfFree
A review of refractory materials for vapor-anode AMTEC cells does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A review of refractory materials for vapor-anode AMTEC cells, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A review of refractory materials for vapor-anode AMTEC cells will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1252948