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Abstract
Friction at the interface between tools and powder plays a significant role in the cold die compaction process in both compression and ejection steps. In this work, the influence of tools materials and coatings as well as lubricant content in the powder is investigated with a sliding piece device. Three iron powders with different amounts of lubricant, from 0 wt-% to 0·6 wt-% (all percentages are expressed in weight), are tested on eleven parallelepipedic slabs (different couples of material and coating), which simulate tools surfaces. Results are presented in terms of friction coefficient evolution, friction coefficient values and surface analysis. Then they are compared with previous work to check their validity and consistency. Finally an assessment of the friction aptitudes of each slab will be made to open prospects of improving industrial processing conditions.