Wednesday, 30 May 2018 - 13:30 – 13:55
Oral Dialogue Sessions, Room Nautilus 5
Wolfgang Schmitt, Project Leader Paste Development at Heraeus Electronics
Typical pressureless sintering profile carried out in a convection oven takes approximately 4 hours long to complete, which if shorten, increases attractiveness to adopt pressureless sintering. Additionally, the long process time required pressureless sintering to perform under nitrogen atmosphere in a convection oven to prevent oxidation of the substrate surfaces or chip metallization.
The main objective of this study was to investigate using IR radiation to reduce the total sintering process time.
We found out that with this new alternative process, it is possible to sinter dies with sizes up to 50 mm² under air atmosphere with the total process time of less than 2 hours. Scanning acoustic microscopy images demonstrate that delamination was not observed in the sintered joint of the samples sintered by IR after 48 hours pressure cooker test with conditions of 100% RH at 110°C and 100 thermal cycles with a condition of -40°C/+125°C. Cross section of sintered layer obtained by IR sintering and conventional pressureless sintering was performed in this study and the images illustrate that a more homogeneous sintered layer was achieved by IR sintering.
Authors: Wolfgang Schmitt, Ly May Chew, Robert Miller