Mitigated Dissimilar Mass Transfer with Aluminized RAFM Steels in Flowing PbLi at 650°C

de Lamater-Brotherton, Claude; Romedenne, Marie; Zhang, Ying; Pint, Bruce A.

doi:10.1080/15361055.2025.2498195

Mitigated Dissimilar Mass Transfer with Aluminized RAFM Steels in Flowing PbLi at 650°C

Journal Article · Thu Jun 12 00:00:00 EDT 2025 · Fusion Science and Technology

DOI:https://doi.org/10.1080/15361055.2025.2498195· OSTI ID:2573514

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Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Tennessee Technological Univ., Cookeville, TN (United States)

To evaluate dissimilar material interactions in flowing eutectic Pb-16at. %Li between fusion-relevant materials and to establish a maximum operating temperature of future blanket designs, a series of thermal convection loop (TCL) experiments with flowing PbLi have been conducted. Following a 1000-h, 550°C to 650°C TCL experiment, a thin reaction product was observed on the surface of monolithic, high-purity SiC. To identify the source of the observed dissimilar material interaction and to understand the reaction kinetics, an identical 2000-h TCL exposure was conducted, but less reaction of the SiC specimen was observed. Characterization of the FeCrAlMo (alloy APMT) loop tubing and the PbLi-exposed austenitic stainless steel (SS) assembly parts suggested that the formation of the reaction layer on the surface of the PbLi-exposed SiC did not originate from the coated reduced activation ferritic martensitic (RAFM) steel, but from the dissolved loop materials (liquid metal exposed APMT tubing and type 316 SS fittings). Here, the results, after 2000 h, suggest that the dissimilar material reaction between the Al-coated RAFM steel and the SiC has very slow reaction kinetics within a temperature gradient of 550°C to 650°C.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2573514

Journal Information:: Fusion Science and Technology, Journal Name: Fusion Science and Technology; ISSN 1536-1055; ISSN 1943-7641

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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