Exploring the role of Mn–Co spinel coating on Crofer 22 APU in adjusting reactions with the Ag based sealant during reactive air brazing

Journal of Materials Research and Technology

卷:16

Jian Cao¹  Xiaoqing Si²  Dong Wang²  Chun Li²  Junlei Qi² 

[1] Corresponding author.;

[2] State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China;

关键词: Mn–Co spinel Coating;    Reactive air brazing;    Solid oxide fuel cell;    Ag–CuO braze;    Interfacial reactions;   

DOI  :  

来源: DOAJ

【 摘 要 】

In this work, the Mn–Co spinel coating is successfully employed to control adverse reactions at the Crofer 22 APU interconnect/Ag–CuO braze interface through blocking their direct contact. The Mn–Co spinel coating is fabricated on the Crofer 22 APU before reactive air brazing (RAB). Wetting of Ag–CuO braze on the Mn–Co spinel coated Crofer 22 APU is studied. Ag-8mol%CuO braze is used to successfully braze the Mn–Co spinel coated Crofer 22 APU and YSZ at 1050 °C for 30 min in air. The Crofer 22 APU is protected well by the Mn–Co spinel coating during RAB, avoiding its oxidation and the outward diffusion of Fe and Cr. The long-term stability of joints is also evaluated in air at 800 °C for 200 h. The Mn–Co spinel coating effectively mitigates further degradation of the joint caused by oxidation at the interconnect/braze interface.

【 授权许可】

Unknown