Influence of environment on self-propagating reactions in Al/Ni multilayer foils

Shekhawat, Deepshikha; Baloochi, Mostafa; Sudhahar, Dwarakesh; Raheja, Vishal Amarbhai; Döll, Joachim; Jacobs, Heiko O.; Pezoldt, Jörg

doi:10.1557/s43580-023-00574-6

MRS Advances

2023

DOI: 10.1557/s43580-023-00574-6

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Influence of environment on self-propagating reactions in Al/Ni multilayer foils

Deepshikha Shekhawat

Mostafa Baloochi

Dwarakesh Sudhahar

et al.

Abstract: Reactive aluminum–nickel multilayer system shows exothermic energetic materials which act as a heat source for packaging and bonding of microsystems. The main challenge is controlling the self-propagation reaction velocity and temperature generated by thermal management through different thermal conductive substrate materials. The current work investigates the heat distribution of Al/Ni multilayer foils from different thermal conductive substrates which act as heat sink materials during the self-propagating re… Show more

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2024

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Cited by 3 publications

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Transfer of Self‐Sustained Reactions between Thermally Coupled Reactive Material Elements

Shekhawat,

Breiter,

Döll

et al. 2024

Adv Eng Mater

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System engineering requires the implementation of assembly methods allowing the formation of functional elements according to a desired system design. This is possible by joining prefabricated elements on a desired place in the system or by forming functional materials at wanted locations. Both approaches need temperature treatment. A typical system in part consists of materials restricting the use of annealing procedures above 300 °C. For this reason, higher‐temperature operations have to be localized to the point of use and transferred to the next reactive element. A further requirement is the reduction of the thermal budget of the localized joining process implementing ultrashort heat treatment operations. Reactive metallic multilayer offers the combined possibility of implementing a localized heat source and the formation of a functional intermetallic alloy. The article demonstrates the feasibility of a heat and reaction transfer chain in a topological structured pattern consisting of localized reactive multilayer materials under conditions of their gasless combustion. For the used Ni/Al multilayer material system, the critical (obstacle thickness) dimensions for the reaction and heat transfer are determined using a high‐speed camera and pyrometer measurements.

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Transfer of Self‐Sustained Reactions between Thermally Coupled Reactive Material Elements

Shekhawat,

Breiter,

Döll

et al. 2024

Adv Eng Mater

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show abstract

Controlling reaction transfer between Al/Ni reactive multilayer elements on substrates

Shekhawat,

Sulman,

Breiter

et al. 2024

MRS Advances

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Reactive multilayers produce exothermic reaction with definite velocity and maximum temperature after ignition, which are the fundamental properties of the reactive multilayer systems. The generated heat with certain velocity makes it widely used in joining, bonding in the packaging, thermal batteries and many more applications. In this work, a distinct approach for achieving a reaction transfer between the reactive multilayers and different materials is demonstrated which can affect the generated temperature and velocity from the self-propagating properties of the reaction. For these intensions, we fabricated the Al/Ni reactive elements with certain separations between elements which allow to observe the reaction front transfer and emitted temperature in the reaction chain. The created separation between reactive elements are periodical and ordered systems with different thermal conductive properties. The temperature and definite velocity were measured by time-resolved pyrometer and high-speed camera measurements. SEM analysis showed the characteristics of the reaction transfer between reactive multilayer elements. It is predicted that: (I) The reaction front stops at a space with critical length; (II) Reducing heat loss through the substrate supports reaction front propagation through spaces; (III) Thermal property design of the spaces between the reactive elements enables property modification of the self-propagating reaction. Graphical abstract

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Modelling reaction transfer velocities in disconnected compact heterogeneous multilayer reactive material systems

Shekhawat,

Sindhani,

Raheja

et al. 2024

MRS Advances

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The tuning of the self-propagating reaction is studied theoretically by introducing a non-reactive material between two reactive material elements. For the study, the Ni/Al bilayer system was chosen. The Ni/Al elements were placed on a silicon wafer covered with a 1-µm-thick silicon dioxide. The spaces between the multilayer reactive material elements were filled with different non-reactive materials covering a wide range of thermal properties. On top of this heterogeneous layer, a 1-µm-thick sealing layer was placed consisting of the filler material. The carried out two-dimensional simulations demonstrated that embedding material allows to scale the ignition transfer time and the heat propagation velocity. For example, for a transfer length of 1 µm, the ignition time can be tuned from nano- to microseconds. Consequently, in contrast to previous results embedding materials allow scaling the properties of the self-propagating reaction in heterogeneous reactive material systems. Graphical abstract

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Influence of environment on self-propagating reactions in Al/Ni multilayer foils

Cited by 3 publications

References 14 publications

Transfer of Self‐Sustained Reactions between Thermally Coupled Reactive Material Elements

Transfer of Self‐Sustained Reactions between Thermally Coupled Reactive Material Elements

Controlling reaction transfer between Al/Ni reactive multilayer elements on substrates

Modelling reaction transfer velocities in disconnected compact heterogeneous multilayer reactive material systems

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