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<p>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&#xa0;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 <i>Q</i>-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.</p>

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

  • 期刊论文

  • 发表日期：

    2026年3月21日

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  • Gengrun Ke,
  • Jingjing Feng,
  • Mingsheng Ma,
  • Yongxiang Li,
  • Zhifu Liu

摘要

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.