About this Abstract |
Meeting |
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
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Symposium
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2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
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Presentation Title |
Powder Feed Mechanism for Convection of High-Cohesion, Sub-20-Micron Powders in Directed Energy Deposition |
Author(s) |
John Byers, Adam Eungard, Joseph Jafari, Jennifer Bennett |
On-Site Speaker (Planned) |
John Byers |
Abstract Scope |
Functionally graded material (FGM) ceramics are a promising material for thermal applications to reduce the stress concentrations due to different thermal expansion coefficients at dissimilar material joints. Directed Energy Deposition (DED) enables processing of these FGMs by varying composition during deposition. However, ultra-high temperature ceramics, such as Titanium Diboride, cannot currently be deposited by DED. Using a reactive laser deposition approach may enable deposition of these materials but there are powder feed system limitations. Boron powder exhibits higher cohesion, lower density, and smaller particle sizes compared to traditional DED powders resulting in poor flowability. A feed system was developed by combining a feed screw and powder agitator to facilitate the delivery of boron powder to the mixing chamber of DED systems at precise and variable feed rates. The feed system successfully conveyed boron powder at variable rates enabling control over percent composition of boron and titanium to create a FGM. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |