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On the Structural and Chemical Homogeneity of Spark Plasma Sintered Tungsten

1
Institute of Plasma Physics, Za Slovankou 3, 18200 Prague, Czech Republic
2
Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 11519 Prague, Czech Republic
3
Department of Metals and Corrosion Engineering, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague, Czech Republic
4
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 12116 Prague, Czech Republic
5
Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
former affiliation: Leco Instrumente Plzeň, spol. s r.o., Plzeň, Czechia.
Metals 2019, 9(8), 879; https://doi.org/10.3390/met9080879
Received: 27 June 2019 / Revised: 1 August 2019 / Accepted: 6 August 2019 / Published: 10 August 2019
(This article belongs to the Special Issue Advanced Tungsten Materials)
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Abstract

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. View Full-Text
Keywords: tungsten; plasma-facing components; spark plasma sintering; homogeneity; carbon; processing factors tungsten; plasma-facing components; spark plasma sintering; homogeneity; carbon; processing factors
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Matějíček, J.; Vilémová, M.; Veverka, J.; Kubásek, J.; Lukáč, F.; Novák, P.; Preisler, D.; Stráský, J.; Weiss, Z. On the Structural and Chemical Homogeneity of Spark Plasma Sintered Tungsten. Metals 2019, 9, 879.

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