A systematic search for metal– indium systems which show a potentially high remelting temperature in diffusion-soldered bonds was done by investigation of phase formation and reaction kinetics in M– In systems (M = Pt, Pd, Mn). Phase equilibration experiments M–In (M = Pd, Mn) were done with powder samples prepared from pure elements, heated in evacuated silica capsules between 200 and 700 °C for 15 min to 570 h, and studied by X-ray diffraction analysis. Diffusion couples M/In (M = Pt, Pd, Mn) were prepared from the foils or wires of pure elements and heated in a bonding furnace or in evacuated silica tubes at 250 – 700 °C for 30 min to 96 h. The couples were cross-sectioned and studied by scanning electron microscopy with energy-dispersive X-ray analysis. The rates of M– In reactions can be semiquantitatively ordered in the sequence Pt > Pd≫Mn ( – In). The activation energy of the well-defined reaction of Mn– In powder samples was calculated to be 56 ± 10 kJ/mol. The activation energies calculated from the layer growth in diffusion couples show a large uncertainty, they are 39 kJ/mol (Pt/In), 23 kJ/mol (Pd/In) and 41 kJ/mol (Mn/In). Pt – In and Pd– In are very promising candidates for diffusion soldering of high-temperature stable bonds.
This study was supported by the German Research Council (DFG) under Grant No. Schm 588/20.
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