| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing of Ceramic-based Materials: Process Development, Materials, Process Optimization and Applications
|
| Presentation Title |
Bonding Mechanisms in Indirect Selective Laser Sintering |
| Author(s) |
Doug Sassaman, Matthew Ide, Joseph J Beaman, Desiderio Kovar |
| On-Site Speaker (Planned) |
Doug Sassaman |
| Abstract Scope |
Ceramics with intricate geometries can be produced by indirect selective laser sintering (SLS) where a polymer is added to bind the ceramic particles together during laser heating. We use observations from video images captured under realistic SLS processing conditions to propose a mechanistic model. We then use the model to predict the operating conditions required to achieve particle bonding during indirect SLS. The physical basis for the model is that particle bonding occurs when molten polymer binder permeates through the porous ceramic shell that surrounds the polymer particles and forms solid bridges when the polymer solidifies. The model predictions are tested by building parts using a wide range of laser powers and scan speeds to determine experimentally if particle bonding has occurred. The results show that a permeation-based model is an accurate descriptor of binding mechanisms in indirect SLS of mixed polymer/ceramic powders. |