Three-dimensional direct-write printing of metallic microstructures

Abstract eng:
Three-dimensional (3D) printing is referred to create objects by adding material layer-by-layer rather than traditionally removing material from a part. In this study, we developed a method to fabricate metal 3D microstructures consisting of 3D printing at room temperature and two following processes: sintering and copper infiltration. 3D structures such as scaffolds and planetary gears with the filament diameter of 250 µm are printed using a steel micro powders/polylatic acid (PLA) composite at a printing speed of 10 mm/s. The ink concentration is up to 98.28 wt%. Filament porosity of sintered samples is 1.7% ± 0.2%. After sintering, copper is infiltrated into the sintered sample to obtain steel and copper alloy 3D structures.

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