Original title: Crystallite size and sinterability of tungsten
Translated title: Krystalinita a slinovatelnost wolframu
Authors: Brožek, Vlastimil ; Maixner, J. ; Domlátil, J. ; Janča, J. ; Eliáš, M.
Document type: Papers
Conference/Event: Joint seminar Development of materials science in research and education/18th./, Hnanice (CZ), 2008-09-02 / 2008-09-05
Year: 2008
Language: eng
Abstract: [eng] [cze]
Sintering activity of tungsten powders of various origin was tested by modified technique according Agte. The size of crystallites calculated according to Scherrer formula corresponds with density values detected by Mercury porosimetry. Tungsten poder obtained by reduction of tungstates in hydrogen plasma can be recovered to 93 % of theoretical density at the temperature 1350°C. Next increase of the density needs simultaneous application of high pressure. By the BELT technique 95 % density was reached, by plasma spheroidization up to 98 %. Slinovací aktivita wolframových prášků různé provenience byla testována modifikovanou metodou dle Agteho.Velikost krystalitů, vypočtená ze |Scherrerovy rovnice, koresponduje s hodnotami hustot, měřenými rtutovou porozimetrií. Wolframový prášek získaný redukcí wolframanů ve vodíkovém plazmatu lze konsolidovat na 93 % teoretické hustoty již při teplotě 1350°C, další zvyšování hustoty vyžaduje současnou aplikaci vysokých tlaků. Metodou BELT bylo dosaženo hustoty 95 %, u plazmové sferoidizace až 98 %.
Keywords: crystallite size; hydrogen plasma; plasmachemical reduction; Sintering activity; tungsten
Project no.: CEZ:AV0Z20430508 (CEP)
Host item entry: Proceedings of the 18th Joint seminar Development of materials science in research and education, ISBN 978-80-254-0864-3

Institution: Institute of Plasma Physics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0165596

Permalink: http://www.nusl.cz/ntk/nusl-39434


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Research > Institutes ASCR > Institute of Plasma Physics
Conference materials > Papers