For the purpose of modelling powder compaction, a quantitative evaluation of the friction conditions at the die wall interface is required. Using an instrumented compaction die, the friction at the interface between powder compact and die wall was evaluated through an empirical parameter called the slide coefficient, obtained from the applied pressure/transmitted pressure ratio. For powder compaction modelling, knowledge of the friction coefficient at the interface, however, is much more useful but its measurement is difficult in real experimental conditions. A procedure based on the evaluation of the radial stress/axial stress ratio leads to the quantitative determination of the friction coefficient in admixed zinc stearate added to iron powder with and without die wall lubrication. The resulting decreasing friction coefficient at the end of compaction gives a more uniform density characterised by low loss of pressure 1 Variables associated with single action pressing from through the compact and lower ejection energy per upper punch: angle w characterises radial stress/axial unit volume of the compact.PM/0826 stress ratio Professor Turenne and Ms Gode `re are in the De ´partement de ge ´nie physique et de ge ´nie des mate ´r-and ejection of the green part from the die but are difficult to remove during sintering. Moreover, the importance of iaux, E ´cole Polytechnique de Montre ´al, C.P. 6079, Succ. Centre-Ville, Montre ´al, PQ, H3C 3A7, Canada, the influence of lubricant content in powder mixes on mechanical properties of green and sintered parts is and Dr Thomas and Mr Mongeon are at the Industrial Materials Institute, National Research recognised.3 Some technical approaches have been published to suggest die wall lubrication but the economic Council
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