An electrical insulating ceramic coating on the self-cooled lithium blanket is a promising technology
for suppressing MHD pressure drop in the blanket system. Er2O3is thought to be one of the potential
candidate materials for ceramic coatings because of their high electrical resistivity and high compatibility
with liquid lithium. In this study, Er2O3coating was fabricated on the ferritic steels by dip-coating method
with MOD (metal organic decomposition) liquid precursor followed by baking in different atmosphere.
The coated specimens were immersed at 500
◦
C in the static liquid lithium to test the compatibility. It was
shown that the compatibility of the coating was degraded when Fe2O3or Fe3O4was formed as the main
composition of the substrate oxidation layer during the baking. On the other hand, thin Cr2O3layer in
the substrate oxidation layer did not influence the stability of Er2O3coating. Atmosphere controlling for
suppressing the substrate oxidation, especially Fe2O3or Fe3O4, during the baking is shown to be essential
for the compatibility of MOD Er2O3coating on ferritic steels.
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