scholarly journals Wall-slip of highly filled powder injection molding compounds: Effect of flow channel geometry and roughness

2014 ◽  
Author(s):  
Berenika Hausnerova ◽  
Daniel Sanetrnik ◽  
Gordana Paravanova
Keyword(s):  
Injection Molding ◽  
Wall Slip ◽  
Powder Injection Molding ◽  
Flow Channel ◽  
Powder Injection ◽  
Channel Geometry ◽  
Molding Compounds

Influence of capillary die geometry on wall slip of highly filled powder injection molding compounds

2018 ◽  
Vol 325 ◽  
pp. 615-619 ◽  
Author(s):  
Daniel Sanetrnik ◽  
Berenika Hausnerova ◽  
Petr Filip ◽  
Eva Hnatkova
Keyword(s):  
Injection Molding ◽  
Wall Slip ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Die Geometry ◽  
Molding Compounds

scholarly journals Online Rheometry Investigation of Flow/Slip Behavior of Powder Injection Molding Feedstocks

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 432 ◽  
Author(s):  
Daniel Sanetrnik ◽  
Berenika Hausnerova ◽  
Vladimir Pata
Keyword(s):  
Surface Roughness ◽  
Injection Molding ◽  
Slip Velocity ◽  
Wall Slip ◽  
Powder Injection Molding ◽  
Water Soluble ◽  
Powder Injection ◽  
Powder Particle Size ◽  
Slip Effect ◽  
Rectangular Slit

Wall slip in the flow of powder injection molding (PIM) compounds can be the cause of unrealistically low viscosity values, and can lead to a failure of flow simulation approaches. Regardless of its importance, it has been considered only scarcely in the rheological models applied to PIM materials. In this paper, an online extrusion rheometer equipped with rectangular slit dies was used to evaluate the slip velocity of commercial as well as in-house-prepared PIM feedstocks based on metallic and ceramic powders at close-to-processing conditions. The tested slit dies varied in their dimensions and surface roughness. The wall-slip effect was quantified using the Mooney analysis of slip velocities. The smaller gap height (1 mm) supported the wall-slip effect. It was shown that both the binder composition and the powder characteristic affect slip velocity. Slip velocity can be reduced by tailoring a powder particle size distribution towards smaller particle fractions. The thickness of the polymer layer formed at the channel wall is higher for water-soluble feedstocks, while in the case of the catalytic polyacetal feedstocks the effect of surface roughness was manifested through lower viscosity at smooth surfaces.

Ti-6Al-4V alloy bimodal powders for powder injection molding

2020 ◽  
Author(s):  
Elena Glazkova ◽  
Nikolay Rodkevich ◽  
Nikita Toropkov ◽  
Aleksandr Pervikov ◽  
Marat Lerner
Keyword(s):  
Injection Molding ◽  
Powder Injection Molding ◽  
Powder Injection
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