Nanosecond laser induced ignition thresholds and reaction velocities of energetic bimetallic nanolaminates

Journal Article · Mon Sep 08 04:00:00 EDT 2008 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2981570· OSTI ID:21175577

Picard, Yoosuf N; Yalisove, Steven M ^[1]; McDonald, Joel P; Friedmann, Thomas A; Adams, David P ^[2]

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1. Department of Materials Science and Engineering, University of Michigan, 2300 Hayward Street, Ann Arbor, Michigan 48109-2136 (United States)
2. Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185 (United States)

Thresholds for optically igniting self-propagating reactions are quantified for energetic Ni/Ti, Co/Al, and Al/Pt nanolaminates, where smaller enthalpy material pairs required larger laser ignition fluences. The threshold fluences (J/cm{sup 2}) for ignition by 30 ns laser pulses focused to {approx}8 {mu}m spot size varied from 720 to 15 000 J/cm{sup 2} for Ni/Ti, 8.6 to 380 J/cm{sup 2} for Co/Al, and 3.2 to 27 J/cm{sup 2} for Al/Pt. Conversely, smaller enthalpy nanolaminates exhibited reduced steady-state propagation speeds ranging from 0.05 to 0.9 m/s for Ni/Ti, 0.6 to 8.5 m/s for Co/Al, and 24 to 73 m/s for Al/Pt. Increasing the laser spot diameter tenfold reduced the ignition threshold fluence by as much as two orders of magnitude.

• OSTI ID: 21175577
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 10 Vol. 93; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALUMINIUM
BIMETALS
COBALT
COMBUSTION
IGNITION
LASERS
MIXING HEAT
NANOSTRUCTURES
NICKEL
PLATINUM
PULSES
STEADY-STATE CONDITIONS
TITANIUM