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On the Structural and Chemical Homogeneity of Spark Plasma Sintered Tungsten
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SYSNO ASEP 0509560 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title On the Structural and Chemical Homogeneity of Spark Plasma Sintered Tungsten Author(s) Matějíček, Jiří (UFP-V) RID, ORCID
Vilémová, Monika (UFP-V) RID, ORCID
Veverka, Jakub (UFP-V) ORCID
Kubásek, J. (CZ)
Lukáč, František (UFP-V) ORCID
Novák, P. (CZ)
Preisler, D. (CZ)
Stráský, J. (CZ)
Weiss, Zdeněk (FZU-D) ORCIDNumber of authors 9 Article number 879 Source Title Metals. - : MDPI
Roč. 9, č. 8 (2019)Number of pages 18 s. Language eng - English Country CH - Switzerland Keywords carbon contamination ; mgal2o4 spinel ; powder ; fabrication ; reduction ; oxides ; alloy ; tungsten ; plasma-facing components ; spark plasma sintering ; homogeneity ; carbon ; processing factors Subject RIV JG - Metallurgy OECD category Materials engineering R&D Projects GA17-23154S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UFP-V - RVO:61389021 UT WOS 000484510000069 EID SCOPUS 85073271264 DOI 10.3390/met9080879 Annotation Tungsten-based materials are the prime candidate plasma-facing materials for future fusion reactors, such as DEMO. Spark plasma sintering is a prospective fabrication technology with several advantageous features. The concurrent application of electric current, temperature and pressure enhances the sintering process, allowing for lower temperatures and shorter sintering times than traditional powder metallurgy processes. This in turn helps to avoid excessive grain growth and phase segregation in W-alloys. This study is focused on several factors that may influence the homogeneity of the sintered compacts-namely the diffusion of carbon from the graphite die, purity of the powder and sintering conditions. The following characteristics of spark plasma-sintered tungsten compacts were studied: composition (especially carbon and oxygen content), porosity, mechanical properties (hardness and fracture strength), and thermal diffusivity. The effects of the abovementioned processing factors were quantified, and local variations of selected properties were assessed. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2020 Electronic address https://www.mdpi.com/2075-4701/9/8/879
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