The sessile drop wetting experiment and joint strength test was conducted to study the Ag-3.3mol％ Cu air brazing BaCo0.7Fe0.2Nb0.1O3-δ(BCFNO) mixed-conducting membranes for oxygen. The results indicate that the filler has good wetting property to the substrate; with the temperature increasing the wetting angle decreases and the joining strength increases. Controlling the brazing temperature over the monotectic reaction temperature within a certain range, the CuO-rich liquid reacting with BCFNO playing the role of pre-wetting and forming a reaction layer is beneficial to the improvement of the interface joining strength. Then the interface joining strength of joints can reach 65 ％ of ceramic membranes substrate, fracture occurs mainly in the interface layer between the ceramic substrate and the filler metal.%利用座滴法润湿实验和连接强度测试对Ag-3.3%(摩尔分数)Cu空气钎焊BaCo(0.7)Fe(0.2)Nb(0.1)O(3-8)(BCFNO)混合导体透氧膜陶瓷进行研究.结果表明,此钎料能够很好的润湿BCFNO透氧膜陶瓷,且随着温度的升高润湿角逐渐减小,钎焊界面的连接强度升高.当钎焊温度控制在偏晶反应温度以上一定范围内时,富CuO的液相对BCFNO起到了预润湿作用并形成1层反应层,有利于界面连接强度的提高.这时的界面连接强度可以达到透氧膜陶瓷抗弯强度的65%,断裂主要发生在钎料与陶瓷基界面间的反应层内.
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