Park Yong, Park Jung Jin, Park Kwan Soo, Hong Yong Min, Lee Eun Jung, Kim Sang Ouk, Lee Jong Ho
MLCC Green Chip Lab, MLCC Development Team, Samsung Electro-Mechanics, Suwon-si 16674, Republic of Korea.
Department of Materials Science and Engineering, National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Korea Advanced Institute of Science & Technology (KAIST), Daejeon 34141, Republic of Korea.
Polymers (Basel). 2023 Oct 7;15(19):4014. doi: 10.3390/polym15194014.
To fabricate multilayer ceramic capacitors (MLCCs) that can withstand external impacts, technologies to achieve excellent adhesion and mechanical strength of the cover layer should be essentially developed. Low adhesion and strength of the cover layer can lead to delamination and cracks in the MLCC, respectively. In this study, we present a method for applying polydopamine (PDA), a mussel-inspired adhesive protein, for as robust cover layer on an MLCC. Barium titanate (BT) particles treated with PDA increase the dispersion stability of the BT/PDA slurry, preventing re-agglomeration of the particles and enhancing the adhesiveness and strength owing to the cohesive properties of PDA. Compared to the BT layer, the adhesion of the BT/PDA layer was significantly enhanced by 217%; consequently, the compression modulus of the BT/PDA cover layer increased by 29.4%. After firing, the N-doped graphitic PDA played an important role in producing an MLCC cover layer with increased hardness and toughness. Furthermore, the N-doped graphitic PDA with a hydrophobic surface forms tortuous moisture paths in the cover layer, preventing the degradation of insulation resistance of the MLCC.
为了制造能够承受外部冲击的多层陶瓷电容器（MLCC），必须开发出能够实现覆盖层优异附着力和机械强度的技术。覆盖层的低附着力和强度分别会导致MLCC分层和开裂。在本研究中，我们提出了一种应用聚多巴胺（PDA）（一种受贻贝启发的粘附蛋白）在MLCC上形成坚固覆盖层的方法。用PDA处理的钛酸钡（BT）颗粒提高了BT/PDA浆料的分散稳定性，防止颗粒重新团聚，并由于PDA的内聚特性增强了粘附性和强度。与BT层相比，BT/PDA层的附着力显著提高了217%；因此，BT/PDA覆盖层的压缩模量提高了29.4%。烧结后，N掺杂的石墨化PDA在生产具有更高硬度和韧性的MLCC覆盖层中发挥了重要作用。此外，具有疏水表面的N掺杂石墨化PDA在覆盖层中形成曲折的水分路径，防止MLCC绝缘电阻下降。
