| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing of Ceramic-based Materials: Process Development, Materials, Process Optimization and Applications
|
| Presentation Title |
Towards Direct Additive Manufacturing of Bulk Ceramics Using Selective Laser Flash Sintering |
| Author(s) |
Desiderio Kovar |
| On-Site Speaker (Planned) |
Desiderio Kovar |
| Abstract Scope |
Additive manufacturing of ceramics is usually performed indirectly utilizing a polymer binder to fuse ceramic particles. The removal of the polymer can be impractically slow for large ceramic parts. Selective laser flash sintering (SLFS) uses a combination of an electric field and local heating from a scanning laser to directly fuse particles directly to each other by the formation of particle necks and without the need for a polymer. The combination of laser heating and subsequent Joule heating lead to runaway temperatures and thermal shock cracking during SLFS. Thus, a key challenge is detecting the onset of particle necking and then reducing the electric field before runaway and cracking occurs. We have developed a non-destructive laser acoustic technique to detect the onset of particle necks and are investigating strategies for passively and dynamically controlling electric field to control runaway. Results will be presented for a AlN, LaCrO3-based ceramics, and YSZ. |