A5061206024- Nanomaterials and Printing Technologies
- Additive Manufacturing and 3D Printing Technologies
- Fluid Dynamics and Heat Transfer
- Additive Manufacturing Materials and Processes
- Electronic Packaging and Soldering Technologies
- Recycling and Waste Management Techniques
- Silicon and Solar Cell Technologies
- Advanced Sensor and Energy Harvesting Materials
- Advancements in Semiconductor Devices and Circuit Design
- 3D IC and TSV technologies
- Semiconductor materials and devices
- Electrohydrodynamics and Fluid Dynamics
- Parallel Computing and Optimization Techniques
- Thin-Film Transistor Technologies
University of Freiburg
2015-2022
We present the drop-on-demand generation of liquid microdroplets from aluminum alloy melts with minimum diameters 235 μm. The so-called StarJet technology, used to generate droplets features a pneumatically actuated printhead that has been print solder (T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">melt</sub> ≈ 220 °C) before. In this work novel is presented can be operated at up 950 °C and thus allows for printing alloys. compatible...
This paper presents the results of parameter studies for drop-wise generation metal microstructures from liquid metal. In this context, thin walls (170 μm - 180 thickness) featuring aspect ratios over 50 are printed solder droplets to identify correlation between printing parameters and resulting material properties. Droplet spacing as well substrate temperature varied surface quality in terms roughness is evaluated. Best results, given boundary conditions, achieved with a relative droplet...
This work presents an analysis of the metallic structure microspheres produced by drop-on-demand printing aluminum alloy AlSi12 directly printed from liquid melt via StarJet technology. AlSi alloys are commonly used in casting processes, but microdroplets these materials could potentially be for additive manufacturing metal and composite parts. Recently, several technologies were presented that enable Al-alloy microdroplets. However, material distribution inside droplets is expected to...
We present a novel approach for maskless generation of conductive connections by direct printing molten metal (e.g. solders). This utilizes pneumatically actuated printhead based on the so-called StarJet technology [1, 2], with reservoir containing and star-shaped nozzle chip, allowing deposition liquid lines thus connections. In this work, is used as means to connect Au pads PCBs. The electrical properties pad-to-pad connection Au-pads PCBs test structures pad-to-line transition resistance...
A new method applied to the sensor proposed by Zhang et al. in 2018 is demonstrated this paper that combines benefits of design with fast heating possible nanocalorimetry. By applying a PID regulated pulse instead constant wattage, we unlock an accessible sense morphological changes occurring over short time periods would be invisible methods based only on heat capacity. In study, multilayer Ni/Al thin films were linearly heated at 25, 50, 100, and 200 K/s 700°C, showing two distinct peaks...