In this study, the joint strengths of glass-ceramic sealant placed between two metallic interconnectors (Crofer® 22 APU) are experimentally investigated depending on the surface conditions of the metallic interconnector and electrolyte/electrode materials (YSZ and NiO). The surfaces of the interconnectors are sanded with sandpaper having five different grits (60, 120, 240, 320 and 2000 grits). Thus, roughened surfaces are obtained and the adhesion is examined for each case. Profilometer is used to inspect the surface roughness of the samples. The fracture strengths of 24 samples prepared for each case are determined via tensile tests. Similarly, different electrolyte/electrode materials with modified surfaces are sandwiched between two glass ceramic layers and their mechanical performances are also measured. The results reveal that the joining strength tends to increase with the amount of surface roughness. It is also found that NiO adheres better to glass-ceramic material than YSZ. The microstructures of the adhesion interface of some cases are also investigated by a scanning electron microscopy. The images showed that good adhesion is achieved without any delamination or cracks at the interfaces. Chemical formation between the glass-ceramic sealants, interconnects and SOFC components is further investigated by XRD analyses.

中文翻译：

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金属互连表面粗糙度对固体氧化物燃料电池键合强度的影响


在本研究中，根据金属互连器和电解质/电极材料（YSZ 和 NiO）的表面条件，对放置在两个金属互连器 (Crofer® 22 APU) 之间的玻璃陶瓷密封剂的接合强度进行了实验研究。使用具有五种不同粒度（60、120、240、320 和 2000 粒度）的砂纸打磨互连器的表面。因此，获得粗糙表面并检查每种情况的粘附性。轮廓仪用于检查样品的表面粗糙度。通过拉伸试验确定每种情况下制备的 24 个样品的断裂强度。类似地，将具有改性表面的不同电解质/电极材料夹在两个玻璃陶瓷层之间，并测量它们的机械性能。结果表明，接合强度随着表面粗糙度的增加而增加。还发现 NiO 对微晶玻璃材料的粘附性比 YSZ 更好。一些情况下的粘合界面的微观结构也通过扫描电子显微镜进行了研究。图像显示，界面处没有任何分层或裂纹，实现了良好的粘合力。通过 XRD 分析进一步研究了玻璃陶瓷密封剂、互连件和 SOFC 组件之间的化学形成。