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Boosting screen-printing and microwave electrical performance of copper paste for LTCC applications through rheological control.

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Title: Boosting screen-printing and microwave electrical performance of copper paste for LTCC applications through rheological control.
Authors: Ke, Gengrun1,2 (AUTHOR), Feng, Jingjing1 (AUTHOR) fengjingjing@mail.sic.ac.cn, Ma, Mingsheng1 (AUTHOR), Li, Yongxiang3 (AUTHOR), Liu, Zhifu1,2 (AUTHOR) liuzf@mail.sic.ac.cn
Source: Journal of Materials Science: Materials in Electronics. Mar2026, Vol. 37 Issue 9, p1-13. 13p.
Subjects: Rheology, Screen process printing, Propylene carbonate, Non-Newtonian flow (Fluid dynamics), Conductive ink, Low Temperature Cofired Ceramic technology, Thixotropy
Abstract: Copper electrode pastes for LTCC applications have advantages of high electrical conductivity and low cost. In this work, a novel Poly (propylene carbonate) (PPC) organic vehicle is developed, and its effects on rheological characteristics, screen-printing properties, and microwave electrical performance of copper paste are systematically investigated. PPC organic vehicle imparts ideal pseudoplasticity and thixotropy to copper paste, enabling precise screen-printing of fine lines below 40 μm and forming an excellent surface morphology. Moreover, PPC organic vehicle decomposes completely in nitrogen atmosphere without carbon residues. Copper electrode exhibits an ultra-low sheet resistance of 0.4 mΩ/□, along with outstanding high-frequency performance, including a skin conductivity close to 64% of the theoretical value and a high Q-factor of 4964. This work achieves a synergistic improvement in screen-printing compatibility and microwave electrical performance in copper electrode paste, providing a reliable material solution for the high-performance LTCC components. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Copper electrode pastes for LTCC applications have advantages of high electrical conductivity and low cost. In this work, a novel Poly (propylene carbonate) (PPC) organic vehicle is developed, and its effects on rheological characteristics, screen-printing properties, and microwave electrical performance of copper paste are systematically investigated. PPC organic vehicle imparts ideal pseudoplasticity and thixotropy to copper paste, enabling precise screen-printing of fine lines below 40 μm and forming an excellent surface morphology. Moreover, PPC organic vehicle decomposes completely in nitrogen atmosphere without carbon residues. Copper electrode exhibits an ultra-low sheet resistance of 0.4 mΩ/□, along with outstanding high-frequency performance, including a skin conductivity close to 64% of the theoretical value and a high Q-factor of 4964. This work achieves a synergistic improvement in screen-printing compatibility and microwave electrical performance in copper electrode paste, providing a reliable material solution for the high-performance LTCC components. [ABSTRACT FROM AUTHOR]
ISSN:09574522
DOI:10.1007/s10854-026-16990-x