Reactive air brazing (RAB) is a cost‐effective way to produce ceramic–ceramic or ceramic–metal brazed joints in air, without applying a protective gas atmosphere or a vacuum. In addition to conventional furnace technology, the brazing with induction heating can also be used effectively. Within the scope of this study the shrinkage and wetting behavior of self‐developed brazing pastes with different CuO contents and two qualities of silver powders with coarse and fine particle size are investigated by optical dilatometry on alumina (Al₂O₃, 99.7% purity). Thereby, the fine silver powder quality reveals a significant swelling effect at high temperatures, leading to an expansion of densified powder compacts caused by evolving gases. Joining tests are performed on ceramic–steel brazed joints using a muffle furnace and induction heating for short brazing cycles. The brazing seams and interfaces of the joints are investigated using scanning electron microscopy (SEM) and energy‐dispersive X‐ray spectroscopy (EDS). As a result, correlations between the brazing filler metal composition, the steel, and the brazing conditions are obtained.

中文翻译：

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钎焊膏成分对活性空气钎焊金属陶瓷接头润湿行为的影响

反应空气钎焊（RAB）是一种在不使用保护性气体气氛或真空的情况下在空气中生产陶瓷-陶瓷或陶瓷-金属钎焊接头的经济有效的方法。除常规炉技术外，感应加热钎焊也可有效使用。在本研究的范围内，通过光学膨胀法在氧化铝（Al ₂ O _3）上研究了具有不同CuO含量和两种质量的粗粉和细粉银粉的自行开发的钎焊膏的收缩和润湿行为。，纯度为99.7％）。因此，优良的银粉品质显示出在高温下的显着溶胀效果，导致由放出的气体引起的致密粉体的膨胀。连接测试是使用马弗炉在陶瓷-钢钎焊接头上进行的，并采用感应加热来缩短钎焊周期。使用扫描电子显微镜（SEM）和能量分散X射线能谱（EDS）研究了接头的钎焊接缝和界面。结果，获得了钎料金属成分，钢和钎焊条件之间的相关性。