Abstract
Ethyl celluloses (ECs) organic binder with different molecular weights and contents was applied to silver pastes for LTCC applications. The effective spheres (S) of EC molecules are proportional to the molecular weight of ECs. Large EC molecular weight and content make the entanglement of polymer chains more significant and improve the strength of network structures inside organic vehicles and pastes, leading to the increase of viscosity and pseudoplasticity, which are beneficial to the screen printing of fine patterns for internal and external electrodes. However, high viscosity and short structure recovery time are not conducive to the screen printing of large area electrodes, resulting in enhanced surface roughness, such as Ra increased from 0.652 for STD 4-based silver paste to 1.803 for STD 300-based silver paste. Furthermore, the printing via-filling performance of silver paste with higher EC content and molecular weight is better, which possesses high viscosity, high pseudoplasticity, suitable thixotropy, and relatively slow wall slip rate. The fabrication of LTCC substrates with internal, external, and via electrodes confirmed the good performance of the home-made silver pastes for LTCC applications.
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The data presented in this study are available on request from the corresponding author. The data are not publicly available due to their association with an ongoing study.
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Acknowledgements
The authors would like to thanks the support of the STS project of CAS (Grant No. KFJ-STS-QYZD-2021-07-001), the Key-Area Research and Development Program of Guangdong Province (Grant No. 2020B010176001), the 69th batch of Chinese postdoctoral general support (Grant No. 2021M693264), and Shanghai Science and Technology Innovation Action Plan (Grant No. 20ZR1465500).
Funding
This study was funded by the STS project of CAS,KFJ-STS-QYZD-2021-07-001, the Key-Area Research and Development Program of Guangdong Province (Grant No.: 2020B010176001), the 69th batch of Chinese postdoctoral general support (Grant No.: 2021M693264), Shanghai Science and Technology Innovation Action Plan (Grant No.: 20ZR1465500).
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Conceptualization, JF and ZL; methodology, JF, YG, and FZ; performed the experiments, JF and YG; validation, YG and YG; data discussion, JF, FZ, MM, and ZL; writing—original draft preparation, JF; writing—review and editing, ZL; supervision, YG and KC; project administration and funding acquisition, MM and YG. All authors have read and agreed to the published version of the manuscript.
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Feng, J., Gao, Y., Zhang, F. et al. Effects of organic binder on rheological behaviors and screen-printing performance of silver pastes for LTCC applications. J Mater Sci: Mater Electron 33, 10774–10784 (2022). https://doi.org/10.1007/s10854-022-08059-2
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DOI: https://doi.org/10.1007/s10854-022-08059-2