Thursday, March 20, 2018 - 19:00 – 22:00
2nd lecture hall, Reithalle
Wolfgang Schmitt, Project Leader Paste Development at Heraeus Electronics
The total pressureless sintering process is a function of the die size. The necessary sintering process time increases with increasing the die size.
For conventional pressureless sintering in a convection oven, chips with a size of 16 mm² need approximately 4 hours process time. The long process time is one of the reasons that pressureless sintering process is not a favour sintering process.
Sintering with IR radiation is an alternative process that enables pressureless sintering performed in significantly shorter times. The influence of the chip sizes on the process time of IR sintering is considerably less than conventional pressureless sintering.
In this study, we observed that good sintered joint with no voids and drying channels were obtained for dies with a size of 56 mm² by IR sintering with a total process time of less than 2 hours. Die shear strength of above 15 MPa and a die shear failure mode of cohesive break in the sintered layer were obtained.
Authors: Wolfgang Schmitt, Ly May Chew, Robert Miller