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Mechanical properties and quality of plasma sprayed, functionally graded tungsten/steel coatings after process upscaling

Grammes, Thilo ORCID iD icon 1; Mishra, Ashwini Kumar 2; Battalov, Kamil 2; Purwitasari, Anisa 2; Emmerich, Thomas 2; Aktaa, Jarir 3
1 Institut für Angewandte Materialien – Werkstoff- und Grenzflächenmechanik (IAM-MMI), Karlsruher Institut für Technologie (KIT)
2 Karlsruher Institut für Technologie (KIT)
3 Institut für Angewandte Materialien - Werkstoff- und Biomechanik (IAM-WBM), Karlsruher Institut für Technologie (KIT)

Abstract:

The First Wall of a fusion reactor needs to withstand high heat flux as well as particle bombardment. For this, a First Wall made of steel requires a protective coating with a material that may still transfer heat for conversion to energy, such as tungsten. Its thermal expansion mismatch towards steel is overcome by vacuum plasma spraying of a functionally graded material onto the steel wall, followed by a tungsten top coat. This process was recently transferred to industry for upscaling, to develop a coating technology that can cover the large dimensions of First Wall components without deteriorating the substrate steel's properties by overheating. This work represents an instrumented indentation study of the achieved coating quality and properties, combined with microstructural analysis. Hardness profiles within coating and substrate indicate successful establishment of a linearly functionally graded material and only minor substrate overheating. The latter observation is supported by electron backscatter diffraction showing no change in the substrate's microstructure. The substrate hardness was investigated on several positions of coated plates sizing up to 500 × 250 mm2. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000163206
Veröffentlicht am 20.10.2023
Originalveröffentlichung
DOI: 10.1016/j.matchemphys.2023.128530
Scopus
Zitationen: 2
Web of Science
Zitationen: 2
Dimensions
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Werkstoff- und Biomechanik (IAM-WBM)
Institut für Angewandte Materialien – Werkstoff- und Grenzflächenmechanik (IAM-MMI)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 01.2024
Sprache Englisch
Identifikator ISSN: 0254-0584
KITopen-ID: 1000163206
HGF-Programm 31.13.04 (POF IV, LK 01) In Vessel Components
Erschienen in Materials Chemistry and Physics
Verlag Elsevier
Band 311
Seiten Art.-Nr.: 128530
Vorab online veröffentlicht am 07.10.2023
Nachgewiesen in Dimensions
Web of Science
Scopus
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