Printing of Microwires by Metal Microdroplet Deposition Via Laser-induced Forward Transfer
Laser-induced forward transfer(LIFT)is a metal micro-additive manufacturing process with high resolution,high flexibility,and wide material adaptability,and can achieve the printing of pure metal microstructures base on a nanosecond fiber laser driven micro droplet printing system,which achieves the deposition of a 5 μm diameter copper micro droplet array with a deposition position deviation of±5 μm.By studying the morphology of laser driven micro droplet deposition micro wires under different process parameters,it found that due to the existence of positional deviation of micro droplet deposition,the alternating deposition strategy is more suitable for printing micro wires than the sequential deposition of micro droplets.With the overlap size decrease to 1.5 μm,a continuity wireline was printed.In addition,as the transfer spacing of micro droplets increases from 50 μm to 200 μm,the line width of printed micro wires increases by about twice.Finally,a 15 μm line width micro wire printing was achieved,and the electrical resistivity of the micro wire was obtained to be 9 times that of the solid material through four probe testing.
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