A new three-dimensional (3D) printing process designated as shockwave-induced freeform technique (SWIFT) is explored for fabricating microparts from nanopowders. SWIFT consists of generating shockwaves using a laser beam, applying these shocks to pressure sinter nanoparticles at room temperature, and creating structures and devices by the traditional layer-by-layer formation. Shockwave cold compaction of nanoscale powders has the capability to overcome limitations, such as shrinkage, porosity, rough surface, and wide tolerance, normally encountered in hot sintering processes, such as selective laser sintering. In this study, the window of operating parameters and the underlying physics of SWIFT were investigated using a high-energy Q-switched Nd: YAG laser and nanodiamond (ND) powders. Results indicate the potential of SWIFT for fabricating high-performance diamond microtools with high aspect ratios, smooth surfaces, and sharp edges. The drawback is that the SWIFT process does not work for micro-sized powders.
Three-Dimensional Printing of Nanoscale Powders Using Laser Shockwaves
Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MICRO- AND NANO-MANUFACTURING. Manuscript received June 26, 2015; final manuscript received August 23, 2015; published online September 22, 2015. Assoc. Editor: Bin Wei.
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Molian, P. A. (September 22, 2015). "Three-Dimensional Printing of Nanoscale Powders Using Laser Shockwaves." ASME. J. Micro Nano-Manuf. December 2015; 3(4): 041006. https://doi.org/10.1115/1.4031462
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