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非均匀温度场对激光烧结中导电银浆烧结性能的影响

Effect of Non-Uniform Temperature Field on Sintering Performance of Conductive Silver Paste in Laser Sintering.

作者信息

Zu Wenkai, Xiao Xingzhi, Liu Tingting, Gu Mingfei, Li Gang, Liao Wenhe

机构信息

School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

出版信息

Materials (Basel). 2025 May 19;18(10):2358. doi: 10.3390/ma18102358.

DOI:10.3390/ma18102358
PMID:40429095
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12113246/
Abstract

The non-uniform temperature field in laser sintering critically affects conductive silver paste performance, yet its quantitative relationship with sintering mechanisms remains unclear. This study addresses this issue by proposing effective sintering temperature () and effective sintering time () as metrics to link laser parameters and sintering temperature field with sintering performance. Through full-factorial experiments, finite element simulation, and in situ thermal monitoring, it was revealed that (1) Increasing laser power and reducing laser scanning speed effectively reduce resistivity. For example, at 10 W and 0.1 mm/s, the resistivity reached 6.81 μΩ·cm, which was 88.9% lower than the value of 61.11 μΩ·cm at 2 W and 0.5 mm/s. (2) The resistivity exhibits a threshold effect in its reduction across low-power (<3 W), medium-power (3~4 W), and high-power (>5 W) ranges. (3) The action of laser sintering parameters on sintering performance through and . The resistivity decreases are correlated with , exceeding the exothermic peaks ( = 196 °C and = 232 °C). Unlike prior qualitative analyses, this work quantifies how non-uniform temperature fields govern sintering through and , offering a quantitative method to analyze the temperature field's effect on sintering performance.

摘要

激光烧结过程中不均匀的温度场对导电银浆性能有至关重要的影响，但其与烧结机制的定量关系仍不明确。本研究通过提出有效烧结温度（）和有效烧结时间（）作为指标，将激光参数和烧结温度场与烧结性能联系起来，从而解决了这一问题。通过全因子实验、有限元模拟和原位热监测发现：（1）提高激光功率和降低激光扫描速度可有效降低电阻率。例如，在10 W和0.1 mm/s时，电阻率达到6.81μΩ·cm，比2 W和0.5 mm/s时的61.11μΩ·cm低88.9%。（2）在低功率（<3 W）、中功率（3~4 W）和高功率（>5 W）范围内，电阻率在降低过程中呈现阈值效应。（3）激光烧结参数通过和对烧结性能起作用。电阻率的降低与相关，超过放热峰值（ = 196 °C和 = 232 °C）。与先前的定性分析不同，本工作量化了不均匀温度场如何通过和控制烧结，提供了一种分析温度场对烧结性能影响的定量方法。

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