Transient liquid phase bonding of Cu and Al using metallic particles interlayers. (July 2021)

• Record Type: Journal Article
• Authors: Zaheri, Alireza; Farahani, Mohammadreza; Sadeghi, Alireza; Souri, Naser
• Is Part Of: Proceedings of the Institution of Mechanical Engineers. Volume 235:Number 9(2021)
• Page Start: 1518
• Page End: 1528
• Publication Date: 2021-07
• Subjects: Transient liquid phase bonding -- diffusion -- liquid-solid reactions -- mechanical properties -- microstructure; Mechanical engineering -- Periodicals; Engineering -- Management -- Periodicals; Manufacturing processes -- Periodicals; 629.8
• DOI: 10.1177/0954405420988235
• Languages: English
• ISSNs: 0954-4054

Abstract

The bonding strength, and microstructures of Cu and Al couples using metallic powders as interlayer during transient liquid phase bonding (TLP bonding) were investigated. The interfacial morphologies and microstructures were studied by scanning electron microscopy equipped with energy dispersive X-ray spectroscopy, and X-ray diffraction. First, to explore the optimum bonding time and temperature, nine samples were bonded without interlayers in a vacuum condition. Mechanical test results indicated that bonding at 560°C in 20 min returns the highest bond strength (84% of Al). This bonding condition was used to join ten samples with powder interlayers. Powders were prepared by mixing different combinations of Cu, Al (+Fe nanoparticles) and Zn. In the bonding zone, different Cu9 Al4, CuAl, and CuAl2 intermetallic co-precipitate. The strongest bonding is formed in the sample with the 70Al (+Fe)-30Cu powder interlayer. Powder interlayers present thinner and more uniform intermetallic layers at the joint interface.