Scaling and Transfer Effects in Reactive Materials

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This project aims at defining fundamental rules to control or slow down the formation of reactive materials by two and three dimensional structuring of the reactive multilayers. The effect of the lateral dimension, the spatial arrangement, and the geometrical shape of the structured elements of the reactive multilayers on the ignition behavior, the propagation velocity of the reaction front, and the phase formation will be investigated. In flat binary reactive multilayers with infinite dimen-sion, the most important parameters controlling the reaction rate are the material combinations, the bilayer thickness as well as the thickness of the individual layers and their microstructures. The occurring intrinsic stresses, which are critical for a reliable design of future devices, will be identified by thermomechanical coupled numerical simulations and parameter identification by inverse modelling. The project will answer the following questions: What is the effect of lateral and vertical confinements and the related reaction path on the tailored morphology? How can free surfaces and a materials environment of locally adjusted thermal conductivities be exploited to control the reaction path and the morphology? What is the effect of local changes in the morpho-logy on the reaction and can they be used for the process control? How does the structuring of reactive multilayer affect the reaction and heat propagation? How can the joining process and mechanical properties be controlled by applying the defined fundamental rules? Focusing on scaling and transfer processes the project contributes in cooperation with “Phase field simulation and experi¬mental microstructure research” and “Tailored heat release characteristics for reactive joining processes” to the investigation and formulation of fundamental rules as a precondition of the in¬tegration of reactive materials into joining technology for different application fields.