Active Mixing of Reactive Materials for 3D Printing

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.

doi:10.1002/adem.201900147

Title: Active Mixing of Reactive Materials for 3D Printing

Journal Article · Wed May 15 00:00:00 EDT 2019 · Advanced Engineering Materials

DOI:https://doi.org/10.1002/adem.201900147· OSTI ID:1583047

^[1]; Durban, Matthew D. ^[1]; Fisher, Scott E. ^[1]; Grapes, Michael D. ^[1]; Ortega, Jason M. ^[1]; Spadaccini, Christopher M. ^[1]; Duoss, Eric B. ^[1]; Gash, Alexander E. ^[1]; Sullivan, Kyle T. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1583047

Alternate ID(s):: OSTI ID: 1512824

Report Number(s):: LLNL-JRNL-765043; 954418

Journal Information:: Advanced Engineering Materials, Vol. 21, Issue 8; ISSN 1438-1656

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 25 works

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