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  4. Initial sintering stage of nanostructured metal powder networks studied by dc-conductivity measurements
 
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1993
Conference Paper
Titel

Initial sintering stage of nanostructured metal powder networks studied by dc-conductivity measurements

Alternative
Anfangsstadien des Sinterns von nanostrukturierten Metallpulvern, beobachtet durch DC-Leitfähigkeitsmessungen
Abstract
In powder metallurgy sintering is one of the most fundamental phenomena. Technical sintering is usually realized in a temperature region above 2/3 Tm. Under special conditions the initial stage of sintering can be observed at much lower temperatures. These conditions are: high specific surface area corresponding to a small particle size. This leads to a high specific surface energy as a driving force for sintering. Clean, i.e. oxid-free powder surfaces. Coverage with gaseous impurities would suppress the self diffusion during sintering. This condition are fulfilled for metall powders produced by the inert gas condensation technique using a ultra high vacuum device. The aim of this paper is to figure out the temperature range where sintering actually starts in ultrafine powders. For this purpose in in-situ dc-conductivity measurements have been performed.
Author(s)
Eifert, H.
Günther, B.
Neubrand, J.
Weiß, H.
Hauptwerk
PTM '93. Materials by Powder Technology. Proceedings
Konferenz
International Conference on Materials by Powder Technology 1993
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Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung IFAM
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