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Article Dans Une Revue International Journal of Material Forming Année : 2008

Sintering mechanisms of nascent semi-crystalline polymer powders by high velocity compaction

Résumé

A new technique, the High Velocity Compaction (HVC) allows the processing of nascent semicrystalline powders via sintering. It implies several controlled energy impacts on a powder-filled die. The die is heated up to a temperature below the melting temperature of the powder. Sintering occurs thanks to dissipation of a part of impacts energy which allows local heating and thus melting of a fraction of the powder. The aim of this paper is to evaluate the spatial localization of the part of powder which is melted during HVC process in order to estimate the quality of interparticular welding: "the sintering quality" and to deduce the most probable sintering mechanism. Two polymer powders are tested: PolyOxyMethylene and Ultra High Molecular Weight Poly Ethylene. This objective has been reached in particular thanks to local measurements of mechanical properties which have been performed by nanoidentation. It has been observed that a fraction of the nascent polymer undergoes melting-recrystallization during the process. Then, it is demonstrated that melting-recrystallization is needed to achieve sintering that would occurs by diffusion and intertwining of the chains at the melted state and also cocrystallization during the cooling. In light of these two mechanisms, the sintering quality is discussed in order to have an insight of HVC possibilities to process different type of polymers. © Springer/ESAFORM 2008.
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Dates et versions

hal-01815417 , version 1 (14-06-2018)

Identifiants

Citer

O. Lame, D. Jauffrès, G. Vigier, F. Doré. Sintering mechanisms of nascent semi-crystalline polymer powders by high velocity compaction. International Journal of Material Forming, 2008, 1 (SUPPL. 1), pp.627-630. ⟨10.1007/s12289-008-0334-3⟩. ⟨hal-01815417⟩
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