Investigation of Properties and Thermochemical Mechanisms of the Aging of RAB-Ceramic-to-Metal-Joints

陶瓷-金属接头可以在空气中用银基填料通过反应空气钎焊工艺进行钎焊。在该项目的第一阶段（BO 1979/19-1 PAK 524）中，详细分析了填料与基材之间的反应，并成功地开发了新的填料和工艺。除了钎焊工艺本身，钎焊接头的长期性能也是一个关键方面。在典型的操作条件下，在标准填料中发生的填料和钢之间的反应层的生长可导致接头失效。因此，目的是调查，了解和影响RAB关节的老化行为。必须分析接头的不同部分，即钎焊间隙（钢、金属氧化物、反应区、银基体、陶瓷）对使用条件下老化的影响。必须澄清如何通过改变填充金属和/或钎焊工艺来控制反应层的生长。此外，还将确定采用新开发的填料和工艺钎焊接头的机械性能。

Ceramic-to-Metal-Joints can be brazed in air with silver based fillers by the Reactive Air Brazing Process. During the first period of this project (BO 1979/19-1 PAK 524) the reactions between fillers and base materials were analyzed in detail und new fillers and processes were developed successfully. Beyond the brazing process itself the long term behavior of the brazed joints is a critical aspect. The growth of the reaction layers between the filler and the steel occurring in standard fillers at typical operating conditions can lead to failure of the joint. Consequently the aim is to investigate, understand and influence the aging behavior of the RAB joints. The influence of the different parts of the joint respectively the brazing gap (steel, metal oxides, reaction zones, silver matrix, ceramic) on the aging at service conditions has to be analyzed. It has to be clarified how the growth of the reaction layers can be controlled by varying the filler metals and/or the brazing process. Furthermore the mechanical properties of joints brazed with new developed fillers and processes will be determined.