Silver particle interlayer with high dislocation density for improving the joining of BaZr0.1Ce0.7Y0.1Yb0.1O3- electrolyte and AISI 441 interconnect

• DOI: 10.1016/j.jmat.2022.02.014
• Publication Date: 2022-03-05T07:18:42Z
• Authors: Xiaoyang Wang; Chun Li; Qihan Zhou; Mingshen Li; Mushi Zheng; Junlei Qi; Xiaoqing Si; Jian Cao
• Keywords: Brazing

One of the critical challenges for protonic ceramic fuel cell stack is sealing electrolytes and interconnects. However, traditional AgCuO sealant will aggravate oxidation along interconnect surface result in brittle compound layers at BaZr0.1Ce0.7Y0.1Yb0.1O3-δ (BZCYYb) electrolyte interface. The present work demonstrates that a silver particle interlayer with high dislocation density can be adopted to join BZCYYb (AISI 441 stainless) air instead sealant. Elevating temperatures sufficient bonding Ag/BZCYYb interface, defect-free joint obtained 950 °C. Atomic interface confirmed by TEM. Also, dense thin oxide layer (2–3 μm) formed AISI Ag particles provide main driving force sintering joining. massive dislocations promote recovery recrystallization interlayer, as well interdiffusion BZCYYb/Ag. After aging wet oxidizing atmosphere 600 °C 300 h, joints remain intact dense, indicating superior resistance performance. Besides, shear strength (25.3 MPa) 59 % higher than brazed AgCuO.