SOFC多孔阴极陶瓷薄层的喷墨打印成形机理、微结构表征与构性关系研究

喷墨印刷是一种可能取代当前制造工艺，实现简单高效低成本规模化制造固体氧化物燃料电池（SOFC）陶瓷薄层组件的技术。本项目针对目前喷墨打印SOFC多孔薄层陶瓷阴极所面临的成形效果不理想、微结构-综合性能关系研究匮乏等不足和挑战提出解决方案。首先，采用原位实验和仿真计算相结合的方法深入研究阴极陶瓷墨水的喷墨打印机理，揭示陶瓷墨水流变性、打印条件以及基底性质等对墨滴形成、铺展和干燥等重要过程的流体动力学影响规律。基于对干燥烧结过程中墨水各物相理化性能演变规律的研究，探讨对多孔阴极层最终成形质量的影响。有望为喷墨打印成形效果的提升提供理论依据和技术指导。其次，通过计算机断层扫描技术对阴极层多孔三维微结构进行真实重建，并对关键结构特征数据进行准确量化表征，结合对阴极机械性能和电化学性能的实验测试与数值模拟，系统性建立微观结构和综合性能的构性关系，从而为预测、协同调控和平衡阴极的综合性能奠定参考依据。

Inkjet printing is potentially an alternative to current manufacturing processes for simple, efficient, low-cost and large-scale manufacturing of ceramic thin layer components for solid oxide fuel cells (SOFCs). This project proposes solutions to the problems and challenges faced by SOFCs’ porous thin layer ceramic cathodes prepared via inkjet printing, such as unsatisfactory forming effect and lack of research on microstructure-comprehensive performance relationship. First, the inkjet printing mechanism of the cathode ink is studied by in-situ experiments and simulation. The influence of rheological properties, printing conditions and substrate properties of the ceramic ink on the formation, spreading and drying of ink droplets will be revealed. Based on the study of the evolution of physical and chemical properties of ink phases in the drying and sintering processes, the influence on the final forming quality of the porous cathode layers will be discussed. It is expected to provide theoretical basis and technical guidance for improving the forming effect of inkjet printing of the cathodes. Second, through the construction of the real three-dimensional microstructures using computed tomography technology, the key structural characteristic data will be accurately and quantitatively characterized. With the determination of mechanical and electrochemical properties of the cathodes based on experiments and numerical simulation, the microstructure-comprehensive performance relationship will be built, thereby establishing reference frame to forecast, coordinately control and balance the overall properties of the cathode layers fabricated.