Reactive air brazing of 3YSZ ceramic and aluminized Crofer22H stainless steel was conducted using Pd-modified Ag-2CuO fillers in this study. The influence of Pd content on the interfacial microstructure and the mechanical properties of the joints at room (25 °C) and high temperatures (600 °C) was thoroughly investigated. The results revealed that an increase in Pd content resulted in a decrease in the solubility of O element in the filler system, thereby altering the form of CuO at high temperatures and significantly enhancing its reactivity with aluminized Crofer22H stainless steel. Additionally, there was a significant deterioration observed in the wettability of the fillers on ceramics. Well-joined joints were only achieved with the use of Ag2CuO-3 wt.% Pd filler, resulting in a 27.9% increase in room temperature shear strength due to enhanced interface reaction. At 600 °C, plastic deformation caused Ag-based filler to soften through dynamic recrystallization, but the addition of Pd dissolved in the matrix produced a solute drag effect that inhibited this process and increased joint shear strength by 41.1%.

本研究中使用 Pd 改性 Ag-2CuO 填料对 3YSZ 陶瓷和镀铝 Crofer22H 不锈钢进行反应空气钎焊。深入研究了 Pd 含量对室温（25℃）和高温（600℃）下界面微观结构和接头力学性能的影响。结果表明，Pd含量的增加导致O元素在填料体系中的溶解度降低，从而改变了CuO在高温下的形态，显着增强了其与渗铝Crofer22H不锈钢的反应活性。此外，观察到陶瓷上填料的润湿性显着恶化。仅使用 Ag2CuO-3 wt.% Pd 填料才能实现良好连接的接头，由于界面反应增强，室温剪切强度提高了 27.9%。在600℃时，塑性变形导致Ag基填料通过动态再结晶软化，但溶解在基体中的Pd的添加产生了溶质拖曳效应，抑制了这一过程，并使接头剪切强度提高了41.1%。