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Powder Properties, Compacting and Sintering

Eduard Hryha (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Robert Bidulsky ; Robert Dzunda
Powder Metallurgy - Laboratory Work Tutorial, EPMA/IMR SAS, Kosice, Slovakia, June 2009 p. 9-22. (2009)
[Kapitel]

Metal Powder represents a statistical set of particles with different geometry and mechanical properties. The change from powder to compact under the pressing pressure is interpreted by different overlaying mechanisms:At low pressures the densification occurs by particle ranslations and rotations giving a higher packing coordination; after the particle rearrangement the elastic and plastic deformation of particles starts through their contacts which results in formation of small strain hardened zones. As the pressure increases, the contact area between the particles increases and particles undergo extensive plastic deformation (stage of strain-hardening). The porosity elimination obtained at the pressing pressure p is the result of interactions between the instantaneous geometric properties and instantaneous plastic deformation of particles. Further densification and strengthening is achieved by sintering. The parts are heated in a controlled atmosphere to a sintering temperature (for iron-based alloys this is usually 1100-1150°C; in some cases also up to 1300°C) and held for between 15 and 60 minutes, depending on the application. The main mechanisms of material transport during sintering are surface diffusion, grain boundary and volume diffusion.

Nyckelord: Powder Metallurgy, powder properties, compaction, sintering


This is tutorial for Summer School for PhD Students, organized by European Powder Metallurgy Association at IMR SAS in Slovakia, Kosice, 22-26 June 2009. About 70 PhD students from approx 18 European countries take part in this Summer School every year.



Denna post skapades 2009-12-02. Senast ändrad 2009-12-23.
CPL Pubid: 102631