Active brazing of alumina and copper with multicomponent ag-cu-sn-zr-ti filler

Sri Harini Rajendran, Seung Jun Hwang, Jae Pil Jung

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The study was designed to investigate the synergic effect of Ti and Sn in the active metal brazing of Al2 O3 ceramic to copper brazed, using the multicomponent Ag-Cu-Zr filler alloy. Numer-ous fine and hexagonal-shaped rod-like ternary intermetallic (Zr, Ti)5 Sn3 phase (L/D = 5.1 ± 0.8, measured in microns) were found dispersed in the Ag-Cu matrix of Ag-18Cu-6Sn-3Zr-1Ti alloy, along with the ternary CuZrSn intermetallic phases. An approximate 15 reduction in contact angle and 3.1 C reduction in melting point are observed upon the incorporation of Ti and Sn in Ag-18Cu-3Zr filler. Interestingly, the interface microstructure of Al2 O3 /Cu joints brazed by using Ag-18Cu-6Sn-3Zr-1Ti filler shows a double reaction layer: a discontinuous Ti-rich layer consisting of (Cu, Al)3 (Ti, Zr)3 O, TiO, and in-situ Cu-(Ti, Zr) precipitates on the Al2 O3 side and continuous Zr-rich layer consisting of ZrO2 on the filler side. The shear strength achieved in Al2 O3 /Cu joints brazed with Ag-18Cu-6Sn-3Zr-1Ti filler is 31% higher, compared to the joints brazed with Ag-18Cu-6Sn-3Zr filler. Failure analysis reveals a composite fracture mode indicating a strong interface bonding in Al2 O3 /Ag-18Cu-6Sn-3Zr-1Ti filler/Cu joints. The findings will be helpful towards the development of high entropy brazing fillers in the future.

Original languageEnglish
Article number509
Pages (from-to)1-16
Number of pages16
Issue number3
StatePublished - Mar 2021


  • Active metal brazing (AMB)
  • Ag-Cu-Sn-Zr-Ti filler
  • Multicomponent alloys
  • Shear test


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