In the context of energy devices sealing, two critical considerations are paramount for the safe application of active brazing. First, the design must account for thermal cycling challenges.
If the composition of the filler metals of active metal brazing can be carefully adjusted, it becomes possible to regulate the oxidation process of the susceptible components. In other words, the oxidation products should be evenly distributed within the filler metals and resistant to transformation and coarsening.
In the present work, materials selection is carried out for signal feedthroughs of miniaturized energy sensors with the aim of manufacturing reliable joints by laser brazing. These brazed joints should be hermetic, withstand high temperatures and pressures, and connect the electrodes to insulators.
The former, often referred to simply as active brazing, is the more widely recognized method. The feature of active metal brazing lies in the utilization of stable oxide, carbide, or nitride formers such as titanium (as shown in Table 1, Table 2 and Table 3), zirconium (see references from Sandia National Laboratories ), or hafnium .
Comparison of conventional and active brazing techniques. Active brazing technology can be categorized into two primary groups: active metal brazing and active oxide brazing. The former, often referred to simply as active brazing, is the more widely recognized method.
However, Conze et al. utilized active metal brazing to metallize AlN substrates. The adoption of the active metal-brazing method provides the flexibility to easily switch between copper and alternative metals like nickel, tungsten, or molybdenum. This versatility stands as a significant advantage of the process.