Liquid metal coolants used inside fusion reactors threaten the structural integrity of reactor. A ODS alloy coating is favored to prevent structural damage from within.
Using metallurgical analysis, electron microscopy and spectroscopy, researchers studied the microstructure details of protective oxide layer of ODS alloys SP10 and NF12.Researchers at the Institute of Science Tokyo, in collaboration with Yokohama National University, Nippon Nuclear Fuel Development, and the National Institute for Fusion Science, tested Oxide Dispersion Strengthened alloys with liquid metal flow at 1112°F to simulate a fusion blanket environment.
Nuclear fusion is expected to play a major role in this energy transition as the world works to phase out fossil fuels and turn to cleaner energy sources. Unlike its fission counterpart, nuclear fusion does not produce radioactive waste. The process replicates the reactions that occur in the Sun and, therefore, requires extremely high temperatures.
The material also has high ductility and heat resistance, making it a viable option for high-temperature applications such as high-temperature turbine blades and heat exchangers. Extreme applications of ODS include coating spacecraft during re-entry and now in fusion nuclear reactors. reactors because they can form protective oxide layers such as α-Al2O3 under high-temperature conditions.
Corrosion test of ODS FeCrAl alloys in liquid LiPb at 873K and STEM cross-sectional observation on the surface of pre-oxidized alloy after exposure to liquid LiPb flow . Image credit:The team found that the Al2O3 layer was effective in preventing corrosion initially but also transformed into α-/γ-LiAlO2 after reacting with lithium. Even if ODS alloy was not pre-oxidized, it formed a self-protective layer under these conditions.
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