About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Ceramic Materials and Processing
|
Presentation Title |
Control of Vapor Phase Mixtures for Additively Deposited Carbon Structures |
Author(s) |
Kyle G. Pardue, Charles A Cook, Gregory B Thompson |
On-Site Speaker (Planned) |
Gregory B Thompson |
Abstract Scope |
Laser-assisted chemical vapor deposition (LCVD) allows for the creation of solid material from precursor gases by passing them under the focal point of a laser. Prior work has shown that fibrous carbon can be deposited from hydrocarbon precursors using pyrolytic wavelengths and a translating substrate. Such depositions enable multi-dimensional structure formations. However, at hyperbaric pressures and high laser powers, random nucleation of carbon around the focal point of the beam occurs disrupting growth. This work explores the use of helium and hydrogen mixtures with hydrocarbon gases to help mitigate this disruption. It was found that the sensitivity of the reaction rate to beam power was reduced by the high thermal conductivity of both gases as well as the reactive characteristics of hydrogen. Consequently, the ability to use higher laser powers was enabled to construct additively formed carbon-based structures, which will be demonstrated. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Process Technology, Composites |