Ag-Cu钎料与双相陶瓷透氧膜的润湿和界面反应研究

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

用座滴法测试Ag-Cu合金钎料对Ce0.8Gd0.2O2-δ-NdBaCo2O5＋δ（CGO-NBCO）双相透氧膜的润湿性, 利用SEM-EDS分析润湿和界面反应机理。结果表明： 空气条件下Ag-Cu合金与CGO-NBCO间的润湿遵从界面反应润湿机制。随着Cu含量的增加, Ag-Cu合金对透氧膜润湿性能提高, Cu含量为6.6mol%~15.8mol%时, 润湿角在35°~20°左右。在润湿界面处出现Cu氧化物的富集, 并且在透氧膜侧生成一层由Cu氧化物和CGO-NBCO双相透氧膜反应产生的Ba-Cu-O、Co-Cu-O和Nd-Ce-Cu-O等复杂氧化物相构成的产物层, 新的界面反应层的生成有利于Ag基合金钎料的润湿, 改善了钎料的润湿性能。

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.