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Effect of Temperature on Fretting Corrosion Behaviors between Li₂TiO₃ Pebble and F82H

Haruya MASAKI, Masatoshi KONDO¹⁾, Jae-Hwan KIM²⁾ and Masaru NAKAMICHI²⁾

Tokyo Institute of Technology, School of Environment and Society, Department of Transdisciplinary Science and Engineering, Graduate Major in Nuclear Engineering, Ookayama, Meguro-ku, Tokyo 152-8550, Japan

1)

Tokyo Institute of Technology, Institute of Innovative Research, Laboratory for Zero-Carbon Energy, Ookayama, Meguro-ku, Tokyo 152-8550, Japan

2)

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

(Received 6 February 2022 / Accepted 25 April 2022 / Published 8 July 2022)

Abstract

Lithium titanate (Li₂TiO₃) pebble is a candidate tritium breeder of solid breeder blanket systems of fusion reactors. The oscillation of coolant tubes can be induced by the coolant flow. Fretting corrosion is caused between the Li₂TiO₃ pebbles and the coolant tubes which are made of reduced activation ferritic martensitic steel F82H. The purpose of the present study is to clarify the fretting behaviors at the temperatures of blanket conditions. The Li₂TiO₃ pebble produced by sol-gel method was pushed onto the surface of the oscillating F82H plate in the fretting tests which were performed for 10 min in an air atmosphere up to 573 K. The fretting scars of the Li₂TiO₃ pebble and the F82H plate were observed and analyzed by SEM/EDX and 3D laser scanning microscope. The fretting wear was mitigated at the temperatures of 373 K and 473 K due to the formation of the oxide layer, which might reduce the friction. The pebble was partially destructed by the fretting motion in the test performed at 573 K. The fretting wear of the pebble and the F82H plate was mitigated when the pebble was not fixed on the holder since the pebble could vibrate together with the oscillating plate.

Copyright (c) 2022 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

fretting, corrosion, Li₂TiO₃, F82H, RAFM, fusion blanket, oxide layer, wear, oscillation

DOI: 10.1585/pfr.17.1405075

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