Molecular Dynamics Simulation of Sintering Densification of Multi-Scale Silver Layer

Area of Science:

• Materials Science
• Computational Materials Science

Background:

• Optimizing silver paste for die-attach applications in the electronics industry is crucial.
• Understanding sintering porosity and particle size effects is key to improving paste performance.

Purpose of the Study:

• To simulate initial coating morphology of silver paste using molecular dynamics (MD).
• To analyze the impact of different particle sizes on sintering porosity.
• To theoretically and experimentally validate multi-scale silver sintering for enhanced densification.

Main Methods:

• Established a simulation model using a random algorithm for initial coating morphology.
• Analyzed particle size effects on sintering porosity via MD simulations.
• Conducted semi in-situ observation experiments with micro-nano multi-scale silver paste.

Main Results:

• MD simulations revealed that multi-scale silver particles enhance densification over large-scale particles under identical sintering conditions.
• Theoretical validation confirmed the feasibility of adding small silver particles to large ones.
• Experimental verification supported the theoretical findings on multi-scale sintering.

Conclusions:

• Multi-scale silver sintering is a feasible approach, offering enhanced densification.
• This method provides a valuable reference for optimizing silver paste preparation and sintering processes.
• The findings pave the way for future advancements in silver paste technology for the powering electronics industry.