2D und 3D Werkstoff-Morphologien

2D and 3D material morphologies for reactive microjoining in electronics

Contact person

Prof. Peter Schaaf
Group of Materials for Electricial Engineering and Electronics

Phone: +49 3677 69-3611
e-mail: peter.schaaf@tu-ilmenau.de

Funding information

Project leader: Deutsche Forschungsgemeinschaft 

Project number: SCHA 632/30-2

Participating groups: Group of Materials for Electrical Engineering and Electronics, Electronics Technology Group

Period of funding: 01.10.2023 - 30.09.2025


The use of self-progressing reactions for joining electronic components and in nanotechnology enables fast joining with local heat input, e.g. in electronic packaging. However, the self-propagating reaction is difficult to control and thermomechanical stresses are generated at the joint interface. The project aims to continue the research based on the results obtained in the current first phase. The effect of the surface topography of the substrate on the morphology of the produced reactive multilayer systems (RMS) and its resulting influence on the behavior and response of the Al/Ni RMS was demonstrated in the first phase of the project. However, these effects must be transferred to materials that are of particular interest for microtechnology (Si, Cu, glass, PMMA, Al203). The aim is to investigate the influence of the morphological characteristics and the physical properties of the joining partners on the microstructural characteristics of the manufactured RMS as well as on the thermophysical properties of the system and the reaction kinetics. The final goal is a "suitable" micro-joining process with suitable electrical and thermal properties of a high-quality mechanical joint. The focus is on well-defined geometrically ordered or random surface morphologies which, in combination with the physical properties of the sustrate, influence the growth of the multilayers during sputtering and affect the microstructural properties of the Al/Ni RMS. The substrate properties can change the heat transfer conditions during self-propagation by influencing the velocity and the maximum temperature. The cooling rate is also influenced, which affects the microstructure and morphology of the reaction products.