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

Abstract

Based on molecular dynamics (MD), in this study, a model was established to simulate the initial coating morphology of silver paste by using a random algorithm, and the effects of different sizes of particles on sintering porosity were also analyzed. The MD result reveals that compared with the sintering process using large-scale silver particles, the sintering process using multi-scale silver particles would enhance the densification under the same sintering conditions, which authenticates the feasibility of adding small silver particles to large-scale silver particles in theory. In addition, to further verify the feasibility of the multi-scale sintering, a semi in-situ observation was prepared for a sintering experiment using micro-nano multi-scale silver paste. The feasibility of multi-scale silver sintering is proved by theoretical and experimental means, which can provide a meaningful reference for optimizing the sintering process and the preparation of silver paste for die-attach in powering electronics industry. In addition, it is hoped that better progress can be made on this basis in the future.

Sintering Mechanical Properties of SiC/nano-Ag/Cu: Molecular Dynamics Simulation

“…Gu et al [11] simulated the sintering process of silver particles under four particle sizes and described the four sintering mechanisms. Liang et al [12] simulated the mixed sintering of silver particles of different sizes, and compared it with the sintering of silver particles of the same size, they found that after sintering, silver particles of different sizes had lower porosity and smaller pores, and also found that small particles can be filled between large particles to increase the width of the knotted neck, and "reduce" the distance of the neck.…”