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The influence of substrate temperature and spraying distance on the properties of plasma sprayed tungsten and steel coatings deposited in a shrouding chamber
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SYSNO ASEP 0476705 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The influence of substrate temperature and spraying distance on the properties of plasma sprayed tungsten and steel coatings deposited in a shrouding chamber Author(s) Matějíček, Jiří (UFP-V) RID, ORCID
Vilémová, Monika (UFP-V) RID, ORCID
Nevrlá, Barbara (UFP-V) RID
Kocmanová, Lenka (UFP-V)
Veverka, Jakub (UFP-V) ORCID
Halasová, Martina (UFM-A)
Hadraba, Hynek (UFM-A) RID, ORCIDSource Title Surface and Coatings Technology. - : Elsevier - ISSN 0257-8972
Roč. 318, May (2017), s. 217-223Number of pages 7 s. Publication form Print - P Action International Meeting on Thermal Spraying (RIPT)/7./ Event date 09.12.2015 - 11.12.2015 VEvent location Limoges Country FR - France Event type WRD Language eng - English Country CH - Switzerland Keywords Tungsten ; Steel ; Atmospheric plasma spraying ; Shrouding ; Substrate temperature ; Fusion reactor materials ; Plasma facing components Subject RIV JK - Corrosion ; Surface Treatment of Materials OECD category Coating and films Subject RIV - cooperation Institute of Physics of Materials - Corrosion ; Surface Treatment of Materials R&D Projects GB14-36566G GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 ; UFM-A - RVO:68081723 UT WOS 000402356100025 EID SCOPUS 85006010338 DOI 10.1016/j.surfcoat.2016.10.055 Annotation Plasma spraying is among the alternative technologies for manufacturing tungsten-based coatings or graded interlayers for plasma facing components of fusion devices. The main limitation lies in the relatively low thermal conductivity, stemming from the anisotropic porosity and imperfect bonding between the splats. For several materials, it has been shown that increased substrate temperature leads to improved intersplat bonding and increased coating density. However, spraying of metals at elevated temperatures in ambient atmosphere is accompanied by enhanced oxidation.
This work is focused on the effects of substrate temperature on the properties of plasma sprayed tungsten and steel coatings. A range of substrate temperatures was achieved by varying the preheating temperature, pauses between torch passes, spraying distance and intensity of cooling. To suppress oxidation, the substrates were placed in a special shrouding chamber flushed with argon-hydrogen mixture. The coatings were characterized for their structure, porosity, hardness, thermal conductivity and oxygen content. A marked improvement of these properties with substrate temperature was observed and correlated to the spraying parameters.Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2018
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