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In-situ characterization of the sintering process in ferrous compacts through thermal diffusivity measurement

In-situ-Charakterisierung des Sinterprozesses in Eisensinterteilen durch Messung des Wärmediffusionsvermögens
 
: Danninger, H.; Leitner, G.

Arnhold, V. ; Metal Powder Industries Federation -MPIF-, Princeton/N.J.:
Advances in powder metallurgy & particulate materials 2002. Vol.13: Sintering : Proceedings of the 2002 World Conference on Powder Metallurgy & Particulate Materials, June 16 - 21, Orlando, Fl.
Princeton: Metal Powder Industries Federation, 2002
ISBN: 1-87895-490-3
pp.157-167
World Conference on Powder Metallurgy & Particulate Materials (PM2TEC) <2002, Orlando/Fla.>
English
Conference Paper
Fraunhofer IKTS ()

Abstract
The sintering of ferrous powder compacts was studied in situ by measuring the thermal diffusivity a in a laser flash apparatus. Thermal diffusivity is a measure to characterise the heat flow through a material and depends on the contact area between the paricles and their change during sintering. It is shown that the change of a during sintering is much less pronounced than in the case of cemeted carbides which is not surprising when regarding the widely differing porosity changes. The results are however in good agreement with expectations, the only limiting parameter is the interrupted heating. Shooting a laser pulse demands isothermal conditions for the whole sample, between the pulses the sample is heated with a constant rate. Nevertheless, the trend for the thermal conductivity e calculated from a specific heat and the density is in good agreement with that found for electrical conductivity, both properties being linked through Wiedermann-Franz law, if the metallic character dominates in the sintering contacts.

: http://publica.fraunhofer.de/documents/N-26858.html