UltraRapid Transient-Liquid-Phase Bonding of Advanced Ceramics

摘要

In order to expand the use of advanced ceramics in a broad range of applications, it is necessary to develop methods that allow complex structures to be assembled easily from simpler parts. In some cases, the desired structure may involve the joining of ceramics to themselves, and in other cases, it may be necessary to join the ceramic to other materials, often metals. Ideally, the joints can be produced rapidly and economically, by processes that reproducibly yield attractive mechanical properties, and without compromising the properties of the materials being joined. In practice, this is a very difficult combination to achieve. While brazing is convenient and rapid, thermal-expansion mismatch and its negative effect on strength and reliability are frequent side effects to the use of effective reactive-metal brazes. Although diffusion bonding may provide strong, thermal-expansion-matched joints suitable for elevated-temperature applications, the processing required to form such joints is impractical in commercial applications.