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Recent developments have showcased that micro extrusion of feedstock can be used for manufacturing metallic micro bi-lumen tubes with very high length-to-diameter aspect ratios which are not viable by conventional metal extrusion or commonly used feedstock processing technologies like injection molding or hot pressing. The extrusion of high aspect ratio micro components faces the challenge of maintaining the geometrical accuracy, surface finish and structural properties since the micro extrusion in green-state is followed by debinding and sintering operations which result in shrinkage and variations in surface finish and structure. The stages of the process chain such as solvent/thermal debinding, to remove the polymeric binder, and pre-sintering, to achieve a mild structural rigidity before the sintering, are of critical 1 Corresponding author

Debinding and Presintering of High Aspect Ratio Microbi-Lumen Tubes Produced by Extrusion of 17-4PH Feedstock