About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Symposium
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Poster Session
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Presentation Title |
Controlling Powder Bed Cohesion in Binder Jetting (BJ) |
Author(s) |
Colton Inkley, Brennen Clark, David Martin, Joseph Spencer, Jacob Lawrence, Nathan Crane |
On-Site Speaker (Planned) |
Colton Inkley |
Abstract Scope |
BJ has increased in popularity and capability since its development at MIT and offers advantages such as fast build rates, integrated overhang support, low-power run requirements, and is versatile in material options. However, defects arise during layer spreading and printing that are not readily removed during post-processing. This study explores methods of reducing particle rearrangement and ejection from binder deposition by applying small amounts of moisture to increase the cohesive forces between powder particles. This is achieved using a piezo-electric disk to atomize water and mist the BJ powder bed. Complications arise because BJ’s powder spreading process is most successful when the cohesive strength between particles is small. This was addressed by applying the moisture application after spreading new powder. This ensures that the powder is spread before powder moistening, and while minimizing changes in print time. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |