[2B01-04] Lithium

10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)

[2B03] Study on growth behavior of abnormal oxides in FeCrAl alloy tube machined by WEDM process and mitigation methodology

*Ryuhei Muto¹, Takashi Endo², Masatoshi Kondo¹ (1. Tokyo Tech, 2. Hokkaido univ.)

Keywords:

Fusion reactor,Liquid metal blanket,FeCrAl alloy,α-Al2O3 layer,WEDM

Magnetohydrodynamic (MHD) pressure drop and chemical compatibility with liquid lithium lead (LiPb) are important issues for development of liquid LiPb blanket of fusion reactors. Previous study indicated that α-Al₂O₃ layer formed on FeCrAl alloys according to oxidation treatment in air above 1273 K can function as MHD insulating- and corrosion-resistant layer. In present study, the abnormal oxides enriched in Cu and Zn from brass wire were locally detected in α-Al₂O₃ layer formed on the inner surface of APMT (Fe-22Cr-5Al-3Mo) tubes machined by wire electrical discharge machining. The abnormal oxides were metallurgically analyzed by field emission scanning electron microscope (FE-SEM). The Mitigation method of abnormal oxides is investigated.