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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
Krystalinita a slinovatelnost wolframu
 Brožek, Vlastimil ; Maixner, J. ; Domlátil, J. ; Janča, J. ; Eliáš, M.
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 %.
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