[2H01-03] F82H

[2H03] Fretting corrosion behaviors of Li_2.15TiO₃ pebble and RAFM steel F82H under inert gas environment

*Haruya Masaki¹, Masatoshi Kondo¹, Jae-Hwan Kim², Masaru Nakamichi², Masami Ando², Taehyun Hwang², Yutaka Sugimoto² (1. Tokyo Tech, 2. QST)

Keywords:Fusion reactor, Fretting corrosion, Blanket, Solid breeder, RAFM steel

Fretting corrosion can be induced between tritium breeder pebbles and coolant tubes vibrated due to the coolant flow in the solid breeder blanket of fusion reactors. The purpose is to clarify the fretting corrosion behaviors of tritium breeder pebble and reduced activation ferritic martensitic steel under the condition simulating the fusion blanket. The pebbles of Li₂TiO₃ with excess Li (Li_2.15TiO₃) were produced by emulsion method. The fretting tests between the pebble of Li_2.15TiO₃ and the plate of F82H were conducted at 573 K in the argon environment containing 1 vol% oxygen. The surface of F82H specimen was oxidized at 573 K and became harder. The harder surface revealed the resistance to the fretting corrosion.