|About this Abstract
||MS&T21: Materials Science & Technology
||Additive Manufacturing of Ceramic-based Materials: Process Development, Materials, Process Optimization and Applications
||Direct-writing by Micro Cold Spray of Yttria (Y2O3) Films
||Aidan Moyers, Michael Becker, Desiderio Kovar
|On-Site Speaker (Planned)
The micro cold spray process operates by accelerating aerosolized nanoparticles through a nozzle from atmospheric pressure (200-800 Torr) to mild vacuum (1-10 Torr). These nanoparticles, moving at 100-500 m/s, impact a substrate mounted on an x-y-z stage to allow for the direct-writing of conformal films on complex surfaces. Unlike cold spray, a similar process using larger particles and higher pressures, micro cold spray has the demonstrated capacity to deposit highly dense ceramic films through the mechanism of room temperature impact consolidation (RTIC). In this study, we performed molecular dynamics simulations on spherical yttria nanoparticles to investigate the conditions necessary to achieve RTIC by varying impact velocity, particle diameter, and crystallographic orientation. We then performed experiments to determine how processing variables such as deposition velocity affected the density of yttria films made with 300 nm particles.