石英玻璃纤维织物基底柔性电极制备与性能研究

Preparation and Properties of Flexible Electrodes on Quartz Glass Fiber Fabric Substrates

中文关键词: 导电银浆  石英玻璃纤维织物  热处理  电磁感应烧结

英文关键词: conductive silver paste  quartz glass fiber fabric  heating treatment  electromagnetic induction sintering

中文摘要:

      目的 研制用于石英玻璃纤维织物基底的银/苯氧树脂基丝网印刷导电银浆，印制具有良好导电性能和力学性能的柔性电极，并探索烧结方式对电极性能的影响。方法 以苯氧树脂为有机载体，不同粒径银粉为导电填料，二元酸酯混合物(DBE)为溶剂制备导电银浆。在石英玻璃纤维织物表面丝网印刷柔性电极，对比不同电极体积电阻率优化银浆组分配比。通过弯折实验表征电极力学性能，通过加热实验研究电极温度稳定性，对比高温烧结与电磁感应烧结对电极的影响。结果 银浆含质量分数50%的片状银粉和质量分数10%的超细银粉时，印刷后电极体积电阻率最低且为1.75×10⁻⁵ Ω.cm，触变性满足丝网印刷要求。电极与基底附着力达到5B级别，弯折后电阻变化率<3%。电极在220 ℃高温烧结后导电性提升了51.54%，但烧结时间长达1 h;经电磁感应烧结在14 s内导电性提升了46.7%。结论 使用大、小粒径银粉组合可提高石英玻璃纤维织物表面印刷电极中银颗粒的堆积密度，有利于实现电极的良好导电性和稳定性，电磁感应烧结方法可进一步快速提升电极导电性。本文提出的柔性电极制备方法有望对航空航天材料的多功能化、智能化发展提供重要技术支撑。

英文摘要:

      The work aims to develop a silver/phenoxy resin based conductive screen-printing silver paste used for silica glass fiber fabric substrates to prepare flexible electrodes with strong mechanical and electrical properties, discuss the factors affecting the conductivity of the electrode. The conductive silver paste was prepared with phenoxy resin with high toughness and good adhesion to glass as the organic carrier, micrometer scale flake silver powder as the main conductive filler, ultrafine silver powder as the auxiliary conductive filler, and low volatility DBE as the solvent. The ratio of silver paste components was optimized by comparing the volume resistivity of different electrodes. The mechanical properties of the electrodes were characterized by bending experiment, the temperature stability of the electrodes was studied by heating experiment, and the effects of high-temperature sintering and electromagnetic induction sintering on the electrodes were compared. When the silver paste contained 50% flaky silver powder and 10% ultra-fine silver powder, the volume resistivity of the electrodes after printing was 1.75 × 10–5 Ω. cm, which was the lowest, and the thixotropy met the requirements of screen printing. The adhesion between the electrodes and the substrates reached level 5B, and the resistance change rate after bending was < 3%. The conductivity of the electrodes was increased by 51.54% after sintering at 220 ℃, but the sintering time was as long as 1 h. After electromagnetic induction sintering, the electrical conductivity was increased by 46.7% in 14 s. The combination of silver powder with large and small particle sizes can improve the packing density of silver particles in the printed electrodes on the surface of quartz glass fiber fabric, which is conducive to the realization of good electrical conductivity and stability of the electrodes. The electromagnetic induction sintering method can further improve the electrical conductivity of the electrodes rapidly. The flexible electrode preparation method proposed in the work is expected to provide important technical support for the multi-functional and intelligent development of aerospace materials.