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

doi:10.15541/jim20150551

Abstract

Abstract:

A reactive air brazing Ag-CuO alloy was evaluated for brazing dual phase oxygen membrane Ce_0.8Gd_0.2O_2-_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

CLC Number:

TQ174

ZHANG Li-Li, LI Ke,YU Chen-Chen, ZHANG Yu-Wen, WU Cheng-Zhang, DING Wei-Zhong. Wetting Properties and Interface Reaction Mechanism of Ag-Cu Brazes on Dual-phase Membrane Ceramic[J]. Journal of Inorganic Materials, 2016, 31(6): 607-612.

Figures/Tables 6

Table 1 Composition of Ag-Cu brazes/mol%

Braze	Cu	Ag
Ag	0	100
Ag -6.6Cu	6.6	93.4
Ag -11.0Cu	11.0	89.0
Ag -15.8Cu	15.8	84.2

Fig. 1 XRD pattern of CGO-NBCO

Fig. 2 Contact angles between Ag-Cu and CGO-NBCO as a function of temperature

Fig. 3 Morphologies of the interfaces between Ag-Cu brazes and CGO-NBCO membrane after wetting experiments. (a) Ag; (b) Ag-6.6Cu; (c) Ag-11Cu; (d) Ag-15.8Cu

Fig. 4 EDS analyses of the interface between Ag-Cu brazes and CGO-NBCO membrane

Fig. 5 Pseudobinary Ag-CuO phase diagram[14]

References 14

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