| About this Abstract |
| Meeting |
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Symposium
|
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Presentation Title |
An Ultrasonic Technique to Determine the Onset of Localized Sintering in Additive Manufactured Ceramics |
| Author(s) |
Christina L. Nissen, Arturo Hernandez-Barreto, Joseph J. Beaman, Desiderio Kovar |
| On-Site Speaker (Planned) |
Christina L. Nissen |
| Abstract Scope |
Detecting the onset of sintering non-destructively is challenging because visible changes to the powder particle morphology may be too subtle to observe directly. One material property that is highly sensitive to even small changes in particle morphology is the Young’s modulus. Here we investigate the use of an ultrasonic laser system to measure the local Young’s modulus from the surface acoustic wave speed. Time-of-flight measurements are made on control samples that were partially sintered at different temperatures. Excellent correlations were found on these monolithic samples between the Young’s moduli determined using the ultrasonic method and established resonance method. We then test the methodology on model samples that have local regions of high density that are embedded in regions of lower density. These tests show that the laser ultrasonic technique can detect local partially sintered and sintered regions within regions of unsintered packed powder beds. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |