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2013
Conference Paper
Titel
Xenon flash sintering of jet printed metal inks
Abstract
Photonic xenon flash sintering of printed nano-particulate Ag and CuNiMn (constantan) structures is possible. The results are affected by the nature of the substrate, as well as by the nature of the printed material including its thickness and morphology. A suitable process window has to be defined for each material-substrate combination. Of most importance are the introduced specific energy per area and the spectrum: they are determined by the process parameters flash intensity and distance, and by the optical filters, respectively. The most promising results of photonic xenon flash sintering with printed Ag structures have been found with the optical blue and red filters BG40 and RG715. Electrical conductivities are similar to typical values reported for printed nano-particulate Ag structures followed by furnace sintering at temperatures between 150 and 350 °C. With photonic sintering we could obtain electrical resistances on PET and PI foils that are only 2.2 and 5.3 times higher, compared to bulk literature values, respectively. Printed nano-particulate CuNiMn structures are more challenging to sinter due to the high affinity to oxygen - here with multiple flashing the electrical conductivity of the structures is decreasing. Even so, we could obtain for the first time electrical conductive CuNiMn structures. The electrical resistances (using the optical filters BG40 and RG715) are about 100 times higher, compared to bulk literature values.