Journal of Inorganic Materials ›› 2016, Vol. 31 ›› Issue (6): 607-612.DOI: 10.15541/jim20150551

• Orginal Article • Previous Articles     Next Articles

Wetting Properties and Interface Reaction Mechanism of Ag-Cu Brazes on Dual-phase Membrane Ceramic

ZHANG Li-Li, LI Ke,YU Chen-Chen, ZHANG Yu-Wen, WU Cheng-Zhang, DING Wei-Zhong   

  1. (State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200072, China)
  • Received:2015-11-09 Revised:2015-12-23 Published:2016-06-20 Online:2016-05-19
  • About author:ZHANG Li-Li. E-mail:
  • Supported by:
    National Natural Science Foundation of China (51174133, 51274139);National Science Fund for Distinguished Young Scholars (51225401)


A reactive air brazing Ag-CuO alloy was evaluated for brazing dual phase oxygen membrane Ce0.8Gd0.2O2-δ- NdBaCo2O5+δ (CGO-NBCO). Contact angle tests were observed between Ag-Cu brazes and CGO-NBCO in air and the interfacial microstructures of the used samples were evaluated by SEM. The results indicate that the wetting angle decreases from 35° to 20° with the content of Cu increased from 6.6mol% to 15.8mol%. It is found that there are copper oxide-enriched zones formed in the junction of the alloy and substrate. The wettability between Ag-CuO alloy and oxygen membrane CGO-NBCO is improved due to the interfacial reaction between Cu oxides in braze and the surface layers of CGO-NBCO substrates to form compounds of Ba-Cu-O, Co-Cu-O and Nd-Ce-Cu-O oxides. The new formed interface reaction layers promote the wettability of the rest braze.

Key words: Ag-Cu alloy brazing filler, dual-phase membranes ceramic, wettability, interface reaction

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