基于3D打印的液态金属柔性电路的性能研究
华东理工大学, 机械与动力工程学院, 上海 200237
| 摘 要： | 为实现快速高效的制造可靠的柔性电路，本文针对Galinstan液态金属与传统电子元件引脚的浸润性进行了分析，并提出了一种基于DLP技术的3D打印直接成型法的柔性电路制造方案。对通过该种方法制作的拉伸电阻以及模拟开关电路进行了基于拉伸，扭转的测试。结果表明：对于暴露在空气中，表面包裹了氧化膜的液态金属，难以浸润电子元件引脚。通过采用NaOH溶液包裹Galinstan的方式可以实现对电子元件引脚的快速浸润，2秒即可完成浸润；浸润后的接触角由原来的131.5°提升至19.7°，且可以被重复润湿，确认了Galinstan是一种可以兼容传统电子元件的柔性电路导体材料。此外，采用本文所提出方法制作的柔性电路的拉伸曲线可以与一次函数进行拟合；在1000次拉伸释放循环后仍然具有稳定的电阻值；模拟开关电路在50%拉伸、180°扭转下仍能正常运行。表明该种电路具有良好的线性度、稳定性和可重复性，可以有效制成柔性传感元件以及柔性电路，为小批量生产个性化电子电路提供了新的思路。 |
| 关 键 词： | 液态金属; 柔性电路; 3D打印; 浸润性; 柔性树脂 |
| DOI： | 10.57237/j.mater.2023.02.001 |
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收稿日期: 2023-04-28
接受日期: 2023-06-20
在线出版日期: 2023-06-29
Performance Research of Liquid Metal Flexible Circuits Based on 3D Printing
School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
| Abstract: | To achieve rapid and efficient manufacturing of reliable flexible circuits, this paper analyzes the wettability of Galinstan liquid metal with traditional electronic component pins and proposes a flexible circuit fabrication scheme based on a direct molding method using 3D printing with DLP technology. Stretch resistors and analog switch circuits fabricated by this method were tested under stretching and twisting conditions. The results show that for liquid metals exposed to air and wrapped with an oxide film, it is difficult to wet the pins of electronic components. By using a NaOH solution to encapsulate Galinstan, the rapid wettability of the pins of electronic components can be achieved, which can be completed in 2 seconds; The contact angle after infiltration has been increased from 131.5° to 19.7° and can be repeatedly wetted, confirming that Galinstan is a flexible circuit conductor material compatible with traditional electronic components. Additionally, the stretching curve of the flexible circuits made using the method proposed in this paper can be with a first-order function; It still has a stable resistance value, after 1000 stretching release cycles; The analog switch circuit can still working under 50% tension and 180 ° torsion. This indicates that the circuits good linearity, stability, and repeatability, effectively enabling the fabrication of flexible sensing elements and circuits, and providing a new approach for small-scale production of personalized electronic circuits. |
| Keywords: | Liquid Metal, Flexible Circuits, 3D Printing, Wettability, Flexible Resin |
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