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

Picard, Yoosuf N.; McDonald, Joel P.; Friedmann, Thomas A.; Yalisove, Steven M.; Adams, David P.
September 2008
Applied Physics Letters;9/8/2008, Vol. 93 Issue 10, p104104
Academic Journal
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/cm2) for ignition by 30 ns laser pulses focused to ∼8 μm spot size varied from 720 to 15 000 J/cm2 for Ni/Ti, 8.6 to 380 J/cm2 for Co/Al, and 3.2 to 27 J/cm2 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.


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