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Title: Ignition and self-propagating reactions in Al/Pt multilayers of varied design

Abstract

The different rate-limiting processes underlying ignition and self-propagating reactions in Al/Pt multilayers are examined through experiments and analytical modeling. Freestanding, ~1.6 μm-thick Al/Pt multilayers of varied stoichiometries and nanometer-scale layer thicknesses ignite at temperatures below the melting point of both reactants (and eutectics) demonstrating that initiation occurs via solid-state mixing. Equimolar multilayers exhibit the lowest ignition temperatures when comparing structures having a specific bilayer thickness. An activation energy of 76.6 kJ/mol at. associated with solid state mass transport is determined from the model analysis of ignition. High speed videography shows that equimolar Al/Pt multilayers undergo the most rapid self-sustained reactions with wavefront speeds as large as 73 m/s. Al- and Pt-rich multilayers react at reduced rates (as low as 0.3 m/s), consistent with reduced heat of reaction and lower adiabatic temperatures. An analytical model that accounts for key thermodynamic properties, preliminary mixing along interfaces, thermal transport, and mass diffusion is used to predict the wavefront speed dependencies on bilayer thickness. Finally, good fits to experimental data provide estimates for activation energy (51 kJ/mol at.) associated with mass transport subject to high heating rates and thermal diffusion coefficient of premixed interfacial volumes (2.8 × 10-6 m2/s). Pt dissolution into molten Almore » is identified as a rate-limiting step underlying high temperature propagating reactions in Al/Pt multilayers.« less

Authors:
 [1];  [1];  [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1570270
Alternate Identifier(s):
OSTI ID: 1468678
Report Number(s):
SAND-2019-10635J
Journal ID: ISSN 0021-8979; 679222; TRN: US2001229
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 124; Journal Issue: 9; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Adams, David P., Reeves, Robert V., Abere, Michael J.K., Sobczak, Catherine Elizabeth, Yarrington, Cole D., Rodriguez, Mark A., and Kotula, Paul G. Ignition and self-propagating reactions in Al/Pt multilayers of varied design. United States: N. p., 2018. Web. doi:10.1063/1.5026293.
Adams, David P., Reeves, Robert V., Abere, Michael J.K., Sobczak, Catherine Elizabeth, Yarrington, Cole D., Rodriguez, Mark A., & Kotula, Paul G. Ignition and self-propagating reactions in Al/Pt multilayers of varied design. United States. doi:10.1063/1.5026293.
Adams, David P., Reeves, Robert V., Abere, Michael J.K., Sobczak, Catherine Elizabeth, Yarrington, Cole D., Rodriguez, Mark A., and Kotula, Paul G. Fri . "Ignition and self-propagating reactions in Al/Pt multilayers of varied design". United States. doi:10.1063/1.5026293. https://www.osti.gov/servlets/purl/1570270.
@article{osti_1570270,
title = {Ignition and self-propagating reactions in Al/Pt multilayers of varied design},
author = {Adams, David P. and Reeves, Robert V. and Abere, Michael J.K. and Sobczak, Catherine Elizabeth and Yarrington, Cole D. and Rodriguez, Mark A. and Kotula, Paul G.},
abstractNote = {The different rate-limiting processes underlying ignition and self-propagating reactions in Al/Pt multilayers are examined through experiments and analytical modeling. Freestanding, ~1.6 μm-thick Al/Pt multilayers of varied stoichiometries and nanometer-scale layer thicknesses ignite at temperatures below the melting point of both reactants (and eutectics) demonstrating that initiation occurs via solid-state mixing. Equimolar multilayers exhibit the lowest ignition temperatures when comparing structures having a specific bilayer thickness. An activation energy of 76.6 kJ/mol at. associated with solid state mass transport is determined from the model analysis of ignition. High speed videography shows that equimolar Al/Pt multilayers undergo the most rapid self-sustained reactions with wavefront speeds as large as 73 m/s. Al- and Pt-rich multilayers react at reduced rates (as low as 0.3 m/s), consistent with reduced heat of reaction and lower adiabatic temperatures. An analytical model that accounts for key thermodynamic properties, preliminary mixing along interfaces, thermal transport, and mass diffusion is used to predict the wavefront speed dependencies on bilayer thickness. Finally, good fits to experimental data provide estimates for activation energy (51 kJ/mol at.) associated with mass transport subject to high heating rates and thermal diffusion coefficient of premixed interfacial volumes (2.8 × 10-6 m2/s). Pt dissolution into molten Al is identified as a rate-limiting step underlying high temperature propagating reactions in Al/Pt multilayers.},
doi = {10.1063/1.5026293},
journal = {Journal of Applied Physics},
number = 9,
volume = 124,
place = {United States},
year = {2018},
month = {9}
}

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Figures / Tables:

Table I Table I: Summary of multilayer stoichiometries and corresponding reactant layer thickness ratios (Al to Pt) used in their design. Film designs cover a range of bilayer thicknesses between 10 and 1600 nm for equimolar designs, with smaller ranges of periodicity for non-equimolar forms as described in Supplemental Information.

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