Development and application of high quality and high reliability brazing filler materials

Combining with international research status and development of high quality brazing filler materials, the latest progress of new type aluminum-based filler metals, silver-based filler metals and iron-based filler metals as well as brazing technology in China and abroad was summarized. Low-melting-point AlSiCu-based filler has high strength and good corrosion resistance, especially it can decrease the surface tension and promote diffusion near the interface after adding a small amount of rare earth elements, which is suitable for brazing high strength aluminum alloys, aluminum/steel and titanium alloys. In addition, novel low temperature nano-multilayer brazing filler and coating preparation technology have achieved a series of new research findings. Special new brazing technologies, including ultrasonic-assisted brazing, plasma-laser hybrid brazing, etc., provide new solutions for liquid phase bonding of materials under fluxless and non-vacuum conditions.