About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Presentation Title |
The Effect of a Gas Stagnation Region on Nanoparticle Impact Velocity during Micro-Cold Spray |
Author(s) |
Stephen G. Bierschenk, Michael F. Becker, Desiderio Kovar |
On-Site Speaker (Planned) |
Stephen G. Bierschenk |
Abstract Scope |
Micro-cold spray is a direct-write process to deposit nanostructured films of metals and ceramics by accelerating solid nanoparticles in a gas stream from ∼1 atm through a nozzle and impacting them at high velocity onto a substrate in vacuum. Particles only deposit within a material-specific impact velocity range because substrate erosion occurs when impact velocities are too high and elastic rebound occurs when impact velocities are too low. Determining this velocity range requires that the particle impact velocity be known. Calculation of the particle velocity is complicated by the stagnation region in the gas flow that forms above the substrate, directly beneath the nozzle, that slows the nanoparticles as they travel towards the surface. We present a study of the effect this region has on nanoparticle impact velocities for a range of carrier gasses, flow rates, nanoparticle diameters, and nanoparticle densities using computational fluid dynamics and particle velocity simulations. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |