Active Mixing of Reactive Materials for 3D Printing
Abstract
The mixing of materials during additive manufacturing is a major benefit which allows one to compositionally and spatially tailor material properties, for example to locally control the reactivity in fuel – oxidizer systems known as thermites. This work characterizes an active mixing printhead used in conjunction with a 3D printing process known as Direct Ink Writing. Besides compositional control, a major benefit of this approach is that it offers a safe method for working with these materials, which can otherwise be hazardous once mixed. Custom fuel and oxidizer inks are fed at fixed volumetric rates into an active mixing printhead, and both the rotational speed of the mixing impeller as well as the fuel – oxidizer ratio are varied. Upon ignition, the propagation speed increases with the rotational speed of the mixer and plateaus above a critical value of ≈750 rpm. The critical mixing speed is corroborated by computational fluid simulations and an analytical expression that considers the inks’ complex fluid behavior. Additionally, varying the composition results in a wide range of propagation speeds with peak reactivity corresponding to a fuel‐rich formulation ( ϕ = 1.5). A test article incorporating a fast‐ and slow‐burning region demonstrates how spatialmore »
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1583047
- Alternate Identifier(s):
- OSTI ID: 1512824
- Report Number(s):
- LLNL-JRNL-765043
Journal ID: ISSN 1438-1656; 954418
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Advanced Engineering Materials
- Additional Journal Information:
- Journal Volume: 21; Journal Issue: 8; Journal ID: ISSN 1438-1656
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; 3D printing; active mixing; additive manufacturing; reactive materials; thermites
Citation Formats
Golobic, Alexandra M., Durban, Matthew D., Fisher, Scott E., Grapes, Michael D., Ortega, Jason M., Spadaccini, Christopher M., Duoss, Eric B., Gash, Alexander E., and Sullivan, Kyle T. Active Mixing of Reactive Materials for 3D Printing. United States: N. p., 2019.
Web. doi:10.1002/adem.201900147.
Golobic, Alexandra M., Durban, Matthew D., Fisher, Scott E., Grapes, Michael D., Ortega, Jason M., Spadaccini, Christopher M., Duoss, Eric B., Gash, Alexander E., & Sullivan, Kyle T. Active Mixing of Reactive Materials for 3D Printing. United States. https://doi.org/10.1002/adem.201900147
Golobic, Alexandra M., Durban, Matthew D., Fisher, Scott E., Grapes, Michael D., Ortega, Jason M., Spadaccini, Christopher M., Duoss, Eric B., Gash, Alexander E., and Sullivan, Kyle T. Wed .
"Active Mixing of Reactive Materials for 3D Printing". United States. https://doi.org/10.1002/adem.201900147. https://www.osti.gov/servlets/purl/1583047.
@article{osti_1583047,
title = {Active Mixing of Reactive Materials for 3D Printing},
author = {Golobic, Alexandra M. and Durban, Matthew D. and Fisher, Scott E. and Grapes, Michael D. and Ortega, Jason M. and Spadaccini, Christopher M. and Duoss, Eric B. and Gash, Alexander E. and Sullivan, Kyle T.},
abstractNote = {The mixing of materials during additive manufacturing is a major benefit which allows one to compositionally and spatially tailor material properties, for example to locally control the reactivity in fuel – oxidizer systems known as thermites. This work characterizes an active mixing printhead used in conjunction with a 3D printing process known as Direct Ink Writing. Besides compositional control, a major benefit of this approach is that it offers a safe method for working with these materials, which can otherwise be hazardous once mixed. Custom fuel and oxidizer inks are fed at fixed volumetric rates into an active mixing printhead, and both the rotational speed of the mixing impeller as well as the fuel – oxidizer ratio are varied. Upon ignition, the propagation speed increases with the rotational speed of the mixer and plateaus above a critical value of ≈750 rpm. The critical mixing speed is corroborated by computational fluid simulations and an analytical expression that considers the inks’ complex fluid behavior. Additionally, varying the composition results in a wide range of propagation speeds with peak reactivity corresponding to a fuel‐rich formulation ( ϕ = 1.5). A test article incorporating a fast‐ and slow‐burning region demonstrates how spatial composition can manipulate the reactivity.},
doi = {10.1002/adem.201900147},
journal = {Advanced Engineering Materials},
number = 8,
volume = 21,
place = {United States},
year = {Wed May 15 00:00:00 EDT 2019},
month = {Wed May 15 00:00:00 EDT 2019}
}
Web of Science
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Works referencing / citing this record:
Designer Direct Ink Write 3D‐Printed Thermites with Tunable Energy Release Rates
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