Abstract
The development of ceramic coating is one of the most important subjects in liquid blanket R&D. The compatibility of candidate ceramic materials (Y 2O 3, Al 2O 3, MgO, 3Al 2O 3–MgO, AlN–BN and BN) with liquid metal breeders such as metallic lithium and lithium-lead alloy (Lil7–Pb83) was investigated at 773 K up to 5 Ms with the change in insulating property. Al 2O 3 and 3Al 2O 3–MgO were severely corroded and dissolved or broken by lithium, while MgO was corroded uniformly with a moderate rate (e.g. 27 μm for 4.8 Ms). The most thermodynamically stable Y 2O 3 was a little corroded and showed a slight increase in electrical conductivity. On the other hand, all the ceramic materials were not corroded at all by Lil7–Pb83, as predicted from a thermodynamical analysis. AlN–BN and BN corroded by lithium became more fragile because impurities included in the specimens were dissolved in lithium.
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