About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Presentation Title |
Surface Nanotextured Powders for 3D Printing of High Reflectivity Metals |
Author(s) |
Ottman A. Tertuliano, Philip Depond, Andrew C Lee, David Doan, X. Wendy Gu, Manyalibo J Matthews, Wei Cai, Adrian J Lew |
On-Site Speaker (Planned) |
Philip Depond |
Abstract Scope |
The widespread application of additive manufacturing is hindered by an inability to control the complex interaction between the energy source and feedstock. Here we develop a process to introduce nanoscale features to the surface of copper (Cu) powders which increases powder absorptivity by ~70% during laser powder bed fusion. The absorptivity increase enables printing of pure Cu structures with densities >90% using low laser powers down to 100W. The nanotextured powders uniquely improve absorptivity and printing conditions at low energy density, reducing machine damage induced by high reflectivity metals. Ray tracing simulations show the measured improved absorptivity is mostly described by increased local absorptivity at the nanoscale features of etched surfaces. High speed video of single-layer hatches is performed to observe modified powder dynamics. The approach taken here demonstrates a generalized approach to modifying the absorptivity and printability of metal powders by only changing the surface texture of the feedstock. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |