Liquid lithium lead (LiPb) eutectic is considered as one of the promising candidates of tritium
breeder materials for fusion reactors. Series experiments on compatibility of LiPb with candidate
structural materials such as CLAM steel and SiC
f
/SiC composites have been done in DRAGON
serious experimental devices in FDS team such as DRAGON-RTand stirred pot device in NIFS at
500
o
C and 600
o
C, respectively. The weight loss of CLAM specimens exposed in flowing LiPb with
the velocity of 0.17m/s increased with temperature, and the morphology and composition of the
corroded surfaces were done by SEM observation and EDX analysis. The coating specimens
including Al
2O3
and FeAl/Al
2O3
coatings prepared on the CLAM specimens were also exposed in the
DRAGON-RT device, the results revealed that there was no obvious thinning observed on the outer
surface of the protective coating. Preliminary analysis of SiC
f
/SiC composites specimens indicated
that the mullite coating with plasma spray method on the SiC
f
/SiC composites specimen corroded in
the high temperature LiPb, but no obvious corrosionattack was observed on the specimen surface,
while the matrix and fiber of reaction-sintered composites showed slightly corrosion attack after
exposure in static LiPb at 800°C for 200 hrs. Further corrosion experiment will be carried out in the
near future.
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