| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Nano/Micro-mechanics and Length-scale Phenomena
|
| Presentation Title |
Deciphering the Fundamental Cause of Shape Distortion in Sintering-based Additive and Non-additive Manufacturing Processes |
| Author(s) |
Sandra Ritchie, Sasa Kovacevic, Prith Deshmukh, Sinisa Mesarovic, Rahul Panat |
| On-Site Speaker (Planned) |
Sandra Ritchie |
| Abstract Scope |
Sintering of nano and/or microparticles is a critical step in many advanced manufacturing processes. Particle consolidation and sintering has been shown to result in shape distortion. Using aerosol jet printing to create various freestanding structures of assembled nanoparticles, we study the mechanisms of shape distortion and developed a model to explain and predict this behavior. Experimental results show that those structures exhibit measurable distortion in the form of permanent curvature upon sintering (with no porosity gradients), indicating mass transport. We hypothesize that temperature difference causes an uneven onset of sintering and shrinkage, which induces mass transport in the direction of the thermal gradient, effectively lengthening areas which heat more slowly. A macroscopic continuum model is developed for nonhomogeneous sintering. The computational results show a remarkable agreement with experiments. Parameters fitted to a series of experiments on the same powder, with different geometries and temperature gradients, exhibit numerical consistency |
| Proceedings Inclusion? |
Planned: |