Evaluation of surface, microstructure and phase modifications on various tungsten grades induced by pulsed plasma loading

0459874 - ÚFP 2017 RIV SE eng J - Journal Article
Vilémová, Monika - Pala, Zdeněk - Jäger, Aleš - Matějíček, Jiří - Chernyshova, M. - Kowalska-Strzęciwilk, E. - Tonarová, Dana - Gribkov, V. A.
Evaluation of surface, microstructure and phase modifications on various tungsten grades induced by pulsed plasma loading.
Physica Scripta. Roč. 91, č. 3 (2016), č. článku 034003. ISSN 0031-8949. E-ISSN 1402-4896.
[PLASMA 2015 : International Conference on Research and Applications of Plasmas. Warsaw, 07.09.2015-11.09.2015]
R&D Projects: GA ČR(CZ) GA14-12837S
Institutional support: RVO:61389021 ; RVO:68378271
Keywords : tungsten * titanium carbide * yttrium oxide * plasma focus * damage
OECD category: 1.3 Physical sciences; 1.3 Physical sciences (FZU-D)
Impact factor: 1.280, year: 2016
http://iopscience.iop.org/article/10.1088/0031-8949/91/3/034003/meta

Progress in the field of nuclear fusion requires the development of a new generation of tungsten materials that are expected to meet specific property, lifetime and safety requirements. Pursuing this goal, the new materials must be properly tested in a wide range of conditions including cases where material is brought to the molten stage, such as with large fusion plasma instabilities. In this study, two prospective candidates from the family of dispersion strengthened (DS) tungsten materials, i.e., W-1%Y2O3 and W-2.5%TiC, were subjected to extreme heat loading exerted by the deuterium plasma generator PF6. The study focuses on the interaction of the tungsten matrix with the dispersed particles during material melting. The materials underwent significant changes in microstructure and phase content. Among the most serious was the loss of TiC particles and void formation in W-2.5%TiC and phase change of polymorphic Y2O3 particles in W-1% Y2O3.

Permanent Link: http://hdl.handle.net/11104/0260036