Pulsed laser ignition of reactive multilayer films

Abstract

Nanostructured Al∕Pt multilayer films were ignited by single pulse irradiation from a Ti:sapphire femtosecond laser system. Critical ignition fluences (0.9–22J∕cm2) required to initiate a self-propagating reaction were quantified for different multilayer designs. Multilayers with smaller bilayer thickness required relatively lower fluence for ignition. Ignition threshold fluence was also found to be 1.4–3.6 times higher for Al-capped multilayers than for Pt-capped multilayers. Ablation threshold fluences were measured for Al (860±70mJ∕cm2) and Pt (540±50mJ∕cm2) and related to the observed difference in ignition fluences for Al- and Pt-capped multilayers.

Combustion of heterogeneous nanostructural systems (Review)

“…Available data [98][99][100][101][102][103][104] on the burning rate, temperature, and regimes are summarized in Table 2. The burning rates usually observed are higher and the maximum temperatures are lower than the corresponding values for powder systems.…”

“…The burning rates above 70 m/sec [100] were later confirmed in [113] where recordbeating velocities of the gasless combustion wave in Pt/Al films were obtained: from 20 to 90 (!) m/sec, depending on the thickness of the layers and the total thickness of the film.…”

“…Velocity of reaction wave propagation versus the period of the multilayer structure (total thickness of two adjacent layers): 1) Ti/Al film, T0 = 473 K, and spark ignition[99]; 2) Ta/Al film, T0 = 473 K, ignition by a heated tungsten wire[99]; 3) Ni/Al film after deposition, T0 = 298 K[98]; 4) Ni/Al film after annealing at 423 K during 90 min[98]; 5) Ni/Al film after annealing at 423 K during 6 h [98]; 6) Ni/Al film after annealing at 423 K during 24 h[98]; 7) 2Ni/Si film with a total thickness of 1.62 μm, T0 = 298 K, laser ignition[102]; 8) 2Ni/Si film with a total thickness of 0.73 μm, T0 = 298 K, laser ignition[102]; 9) Pt/Al film, T0 = 298 K, laser ignition[100]; 10) Nb/Si film, T0 = 298 K[103]; 11) Co/Al film with a total thickness of 7.5 μm[101].…”

Molecular dynamics simulations of the reaction mechanism in Ni/Al reactive intermetallics

“…These materials are fast burning [1] and reach high combustion temperatures [2] without significant volume expansion or the formation of gaseous products. Such characteristics make IRCs promising candidates for applications where strong, localized sources of heat are required.…”

Prediction and characterization of heat-affected zone formation in tin-bismuth alloys due to nickel-aluminum multilayer foil reaction

“…9 The majority of the literature available for this class of materials is largely focused on elucidating the physics of the foil reaction and how structure-property relationships of the foil affect the energy output. [10][11][12][13][14][15][16][17][18][19][20] By comparison, fewer investigations have been undertaken to develop applications for the RMFs. [1][2][3][4][5][6][7] Little is understood regarding the effect of RMFs on neighboring materials (such as a substrate) and the relationship between heat transport in the bulk material and its consequential effect on the microstructure evolution of the ensemble.…”