| About this Abstract |
| Meeting |
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
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| Symposium
|
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Presentation Title |
Fundamentals of Polymer Crystallization in Laser Powder Bed Fusion for New Material Screening |
| Author(s) |
Camden A. Chatham, Samantha J Talley |
| On-Site Speaker (Planned) |
Camden A. Chatham |
| Abstract Scope |
Although laser powder bed fusion (PBF/LB) was one of the first industrially viable additive manufacturing methods, polyamides remain dominant at both commercial- and research-scales. Researchers continue to develop screening methods for evaluating new polymers for PBF/LB. The so-called “SLS Process Window,” which is the difference between melting and crystallization temperature measured at 10 K min-1 as originally outlined in patent literature, is perhaps the most often reported method. The method’s simplistic guidelines are not sufficiently scientifically rigorous to understand how crystallization kinetics affects successful 3D printing. Common understanding of the Process Window omits details from published theories of polymer crystallization, as evidenced by assumptions in PBF/LB process modeling papers. The authors review polymer crystallization in the PBF/LB context and propose replacing the Process Window with crystallization halftime and physical gelation measurements. These measurements better indicate a lengthy coexistence of solid powder and molten polymer affecting warp-free parts. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |