Abstract
A Cu powder-filled solderable epoxy composite (Cu-SEC), in which Cu powders were applied as reinforcement materials, was developed to enhance the mechanical properties of solderable epoxy composite (SEC) joints. To clarify the influence of the Cu powder content on the wettability and mechanical properties of SECs, four types of Cu-SECs with different Cu powder concentrations in the metal fillers (from 0 to 20 vol%) were synthesized, and two types of wetting tests (i.e., planar and line metallization wetting tests), and microhardness tests were conducted. The Cu-SECs for which the Cu powders content less than a certain value (10 vol%) exhibited proper wettability with a reasonable wetting angle and spreading shapes to the Cu metallization in a planar metallization wetting test, and showed excellent selective wetting properties with a uniform and stable selectively wetted conductive path morphologies in a line metallization wetting test. The microhardness of the Cu-SEC joints increased with the increasing Cu powder content due to the strengthening effect of the uniformly distributed Cu powders within the wetted low-melting-point solder (LMS) filler. However, the wettability and selective wetting properties of the molten LMS deteriorated as the Cu powder content increased to more than a certain value because of the partially increased viscosity and reduced fluidity of the fused LMS.
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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgments
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and future Planning (Grant No. 2017R1C1B5076997) and the Korea government (MSIT) (Grant No. 2020R1F1A1075165).
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This research did not receive any specific grant from funding agencies in the public, commercial, or not- for-profit sectors.
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HJY: conceptualization, methodology, investigation, writing-original draft. JIL: visualization, investigation. JMK: supervision, validation. BSY: supervision, validation.
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Youn, H.J., Lee, J.I., Kim, JM. et al. Influence of Cu powders on the wettability and mechanical properties of solderable epoxy composites. J Mater Sci: Mater Electron 33, 10030–10041 (2022). https://doi.org/10.1007/s10854-022-07994-4
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DOI: https://doi.org/10.1007/s10854-022-07994-4