About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Sintering and Related Powder Processing Science and Technologies
|
| Presentation Title |
Understanding particle packing through finite-size Lennard-Jones molecular dynamics |
| Author(s) |
Nathaniel A. Paddock, Richard Riman, Ryan B. Sills |
| On-Site Speaker (Planned) |
Nathaniel A. Paddock |
| Abstract Scope |
Particle packing is central to densification processes such as sintering and hydrothermal liquid phase densification. However, a deep understanding of how and why particle size and morphology affect porosity and pore geometry is lacking, especially when particles are microscale. Towards this goal, we have developed a finite-sized molecular dynamics model for the packing of spherical particles based on a Lennard-Jones based force field. We have compared the model with literature experimental data on loosely packed silica powders with spherical particles to calibrate the force field parameters and validate model predictions. Specifically, we explored the influence of mean particle size on the packing density of polydisperse powders and the pore size distribution of monodisperse powders. After validating the model, we examined factors affecting pore geometry and particle packing density in untapped and tapped powders. The results from these simulation studies will be presented along with their relevance to densification methods. |