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Multiphysics modeling of reactive joining processes
The Advanced Joining Technologies group (https://www.empa.ch/en/web/s202/advanced_joining) of the Laboratory for Joining Technologies & Corrosion (https://www.empa.ch/web/s202) is developing novel joining processes based on reactive nanomaterials, e.g. reactive nanomultilayers (RNMLs). These materials can undergo a strongly exothermal, self-sustaining reaction, and can therefore be utilized as a local heat source for soldering or brazing ("reactive joining"). The challenge with respect to practical application in joining is balancing (i) the dynamic heat production by the RNML with (ii) the (temporary) heat absorption by the solder material, and (iii) the heat dissipation into the adjacent joining partners (and into the environment): If too much heat is produced by the RNML, the joining partners may be damaged. If too little heat is produced, the exothermal reaction can be quenched, or the soldering material is not completely melted, and no joint is formed. Successful reactive joining for a given set of joining partners therefore requires careful selection of the RNML and solder type and thickness.
Keywords: reactive joining, nano-multilayers
Atomistic simulations as well as semi-empirical models for the exothermal reaction within the RNML material are developed by our modeling expert, Dr. Vladyslav Turlo (https://www.empa.ch/web/s204/modeling-simulations) from the Laboratory for Advanced Materials Processing, who will supervise this project. The proposed internship project aims to implement these models into a finite-element software such as COMSOL, including the melting behavior of the solder material as well as the heat transfer within the joining partners. The screening of processing parameters will be done on Swiss National Supercomputing facilities. There is also the possibility to perform some defined experiments in the Advanced Joining Technologies group to validate the simulation (e.g. reaction velocity measurements, or measurements with a thermocamera).
Required skills:
General understanding of physics and chemistry, phase transformation, heat and mass transport phenomena, etc. Prior experience with COMSOL would be an advantage.
Atomistic simulations as well as semi-empirical models for the exothermal reaction within the RNML material are developed by our modeling expert, Dr. Vladyslav Turlo (https://www.empa.ch/web/s204/modeling-simulations) from the Laboratory for Advanced Materials Processing, who will supervise this project. The proposed internship project aims to implement these models into a finite-element software such as COMSOL, including the melting behavior of the solder material as well as the heat transfer within the joining partners. The screening of processing parameters will be done on Swiss National Supercomputing facilities. There is also the possibility to perform some defined experiments in the Advanced Joining Technologies group to validate the simulation (e.g. reaction velocity measurements, or measurements with a thermocamera).
Required skills: General understanding of physics and chemistry, phase transformation, heat and mass transport phenomena, etc. Prior experience with COMSOL would be an advantage.
Numerical simulations and analysis of the joining process could greatly simplify this process, so their implementation and testing in COMSOL is the main objective of this project.
Numerical simulations and analysis of the joining process could greatly simplify this process, so their implementation and testing in COMSOL is the main objective of this project.
Dr. Vladyslav Turlo vladyslav.turlo@empa.ch
https://www.empa.ch/web/s204/modeling-simulations
Dr. Vladyslav Turlo vladyslav.turlo@empa.ch https://www.empa.ch/web/s204/modeling-simulations