TY - JOUR
T1 - Active brazing of alumina and copper with multicomponent ag-cu-sn-zr-ti filler
AU - Rajendran, Sri Harini
AU - Hwang, Seung Jun
AU - Jung, Jae Pil
N1 - Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/3
Y1 - 2021/3
N2 - 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.
AB - 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.
KW - Active metal brazing (AMB)
KW - Ag-Cu-Sn-Zr-Ti filler
KW - Multicomponent alloys
KW - Shear test
UR - http://www.scopus.com/inward/record.url?scp=85102706972&partnerID=8YFLogxK
U2 - 10.3390/met11030509
DO - 10.3390/met11030509
M3 - Article
AN - SCOPUS:85102706972
SN - 2075-4701
VL - 11
SP - 1
EP - 16
JO - Metals
JF - Metals
IS - 3
M1 - 509
ER -