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Fundamental Study on Fretting Corrosion in Solid Breeder Blanket

Naoki TAKAHASHI, Masatoshi KONDO¹⁾, Jae-Hwan KIM²⁾ and Masaru NAKAMICHI²⁾

Tokyo Institute of Technology, School of Engineering, Department of Mechanical Engineering, Graduate Major in Nuclear Engineering, Tokyo 152-8550, Japan

1)

Tokyo Institute of Technology, Institute of Innovative Research, Laboratory for Advanced Nuclear Energy, Tokyo 152-8550, Japan

2)

National Institutes for Quantum and Radiological Science and Technology, Rokkasho 039-3212, Japan

(Received 1 December 2020 / Accepted 31 January 2021 / Published 9 April 2021)

Abstract

Lithium titanate (Li₂TiO₃) is candidate tritium breeder of the fusion blanket systems. The small pebbles of Li₂TiO₃ are packed in the blanket box. The coolant tubes made of RAFM steel F82H (Fe-8Cr-2W-0.1C) are installed in the blanket box and their oscillation is possibly induced by the coolant flow. The fretting corrosion is then caused by the reciprocating slip of the pebbles on the tube wall. The purpose of the present study is to investigate the fundamental behaviors of fretting corrosion between Li₂TiO₃ pebble and the F82H plate. The small pebble of Li₂TiO₃ or Al₂O₃ was placed on the plate specimen of F82H in point contact, and the plate specimen was oscillated horizontally and lineally at the frequency of 50 Hz and the amplitude of 120 μm. The constant load of 4.9 N was applied between the small pebble and the plate specimen. The fretting tests were conducted for 10 and 300 minutes in an air atmosphere at a room temperature. The Li₂TiO₃ pebble was significantly abraded in the tests. The surface of the F82H specimen was damaged due to the scratch with the broken particles of the pebble. The fretting corrosion of F82H was promoted in the test with Al₂O₃ pebble, since the formation and destruction of the oxide layer were repeated on the steel surface in the fretting cycle.

Copyright (c) 2021 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

DEMO, solid breeder blanket, fretting corrosion, F82H, Lithium titanate

DOI: 10.1585/pfr.16.2405032

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