Rheology is the science of flow and deformation
Graph from capillary rheomete
Extrusion is used to form long shapes with constant cross sectional such as rods, tubes or honeycombs.
Feedstock is similar to that used in powder injection moulding.
The powder-binder mixture is placed in a heated barrel.
The shaping die is at the exit of the barrel.
Usually, the feedstock is evacuated during mixing to avoid bubbles in the extrudate.
Once the binder set, it acts as glue to hold particles in place during handling and is subsequently removed prior to sinteringr