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High Heat Flux Testing of Graded W-Steel Joining Concepts for the First Wall
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SYSNO ASEP 0573323 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title High Heat Flux Testing of Graded W-Steel Joining Concepts for the First Wall Author(s) Ganesh, V. (DE)
Dorow-Gerspach, D. (DE)
Bram, M. (DE)
Linsmeier, Ch. (DE)
Matějíček, Jiří (UFP-V) RID, ORCID
Vilémová, Monika (UFP-V) RID, ORCIDNumber of authors 6 Article number 3664 Source Title Energies. - : MDPI
Roč. 16, č. 9 (2023)Number of pages 12 s. Language eng - English Country CH - Switzerland Keywords atmospheric plasma spraying (APS) ; functionally graded material (FGM) ; high heat flux (HHF) ; spark plasma sintering (SPS) ; W-steel Subject RIV JG - Metallurgy OECD category Materials engineering Method of publishing Open access Institutional support UFP-V - RVO:61389021 UT WOS 000986920400001 EID SCOPUS 85159379332 DOI 10.3390/en16093664 Annotation The realization of the first wall (FW), which is composed of a protective tungsten (W) armor covering the structural steel material, is a critical challenge in the development of future fusion reactors. Due to the different coefficients of thermal expansion (CTE) of W and steel, the direct joining of them results in cyclic thermal stress at their bonding seam during the operation of the fusion reactor. To address this issue, this study benchmarks two joining concepts. The first concept uses an atmospheric plasma sprayed graded interlayer composed of W/steel composites with a varying content of W and steel to gradually change the CTE. The second concept uses a spark plasma sintered graded interlayer. Furthermore, in order to benchmark these concepts, a directly bonded W-steel reference joint as well as a W-steel joint featuring a vanadium interlayer were also tested. These joints were tested under steady-state high heat flux cyclic loading, starting from a heat flux of 1 MW/m2 up to 4.5 MW/m2, with stepwise increments of 0.5 MW/m2. At each heat flux level, 200 thermal cycles were performed. The joints featuring a sintered graded interlayer survived only until 1.5 MW/m2 of loading, while the joint featuring plasma sprayed graded interlayer and V interlayer survived until 3 MW/m2. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2024 Electronic address https://www.mdpi.com/1996-1073/16/9/3664
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