Recent progress of Ag-based fillers for active metal brazing: A systematic review

Active metal brazing (AMB) is pivotal in the manufacturing of complex industrial structures owing to its operability and efficiency. Ag-based fillers, an important feedstock for AMB, have garnered significant scientific and industrial interest due to their exceptional wettability, superior plasticity, and versatile applicability. However, a systematic review focusing on Ag-based fillers for AMB is currently deficient. This review systematically summarizes recent advances in Ag-based fillers for AMB, shedding light on key challenges and innovative control strategies. A comprehensive classification of currently employed Ag-based fillers is presented, with particular emphasis on novel fillers developed in recent years. The relationship between interface structure and performance characteristics, and the formation mechanism of joints using Ag-based fillers is thoroughly elucidated. The inherent issues and control strategies for the Ag-based fillers are critically discussed, including the recent breakthroughs in the application of advanced materials. Finally, the future outlook of the Ag-based fillers for AMB is put forward based on the current research status. This review presents a state-of-the-art perspective in Ag-based filler design, interface regulation, and optimization of the joint performance, aiming to provide a reference for further investigation and application of AMB technology.