Macro- and Micro-Deformation Behavior of Sintered-Copper Die-Attach Material
- Resource Type
- Periodical
- Authors
- Suzuki, T.; Yasuda, Y.; Terasaki, T.; Morita, T.; Kawana, Y.; Ishikawa, D.; Nishimura, M.; Nakako, H.; Kurafuchi, K.
- Source
- IEEE Transactions on Device and Materials Reliability IEEE Trans. Device Mater. Relib. Device and Materials Reliability, IEEE Transactions on. 18(1):54-63 Mar, 2018
- Subject
- Engineered Materials, Dielectrics and Plasmas
Components, Circuits, Devices and Systems
Power, Energy and Industry Applications
Copper
Strain
Silver
Load modeling
Electronic mail
Fitting
Sintered copper
sintered silver
power module
finite-element analysis
die-attach material
simulation
mechanical property
porous structure
- Language
- ISSN
- 1530-4388
1558-2574
Macro- and micro-deformation properties of sintered copper die-attach material were evaluated. The macro-deformation properties are the properties, including the contribution of voids, and the micro-deformation properties are the properties, excluding the contribution of voids. Macro-deformation properties were evaluated by tensile tests at room temperature along with finite-element analysis (FEA). The specimens for these tests were made by sintering copper-oxide nano particles in the form of paste in a hydrogen atmosphere under low and high pressures. The micro-deformation properties were estimated by tensile test and FEA using a model that reproduces the micro-porous structure obtained from processing focused-ion beam scanning electron microscope data. The micro-stress/strain curve estimated for sintered copper was found to lie above the sintered silver and below the bulk copper. The porosity dependency of the macro-deformation properties of sintered copper was calculated using FEA models and the estimated micro-deformation property. The results obtained show that the macro-deformation properties of sintered copper are higher than those of sintered silver with similar porosity. This suggests that sintered copper die-attach material requires a lower sintering pressure than for sintered silver to achieve the same strength.