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Two different brazing routes, adopted for making alumina alumina brazed joints, included (i) multi-step Mo Mn metallization, followed by brazing with BVAg-8 alloy and (ii) advanced single-step active brazing with CuSil-ABA® alloy.
Even if such components often contain brazing defects, no failure assessment procedures for brazed joints are reported in the literature.
The shear strength of brazed joints was 207% higher than the joints brazed with single Ag Cu Ti foil when a 100 μm thick Cu interlayer was used.
In this study, Ag Cu Ti/Cu mesh/Ag Cu Ti composite foils were designed to braze ZrB2 SiC C (ZSC) ceramic and GH99 superalloy, and sound brazed joints were obtained.
However, maximum tensile strength of laser brazed joints was 338 MPa, which is approximately 3% lower than furnace brazed joints.
Using Ag Cu Ti/Cu mesh/Ag Cu Ti composite foils, the maximum shear strength of the brazed joints increased to 121 MPa, which is 560% of the joints brazed with Ag Cu Ti filler alloy (21 MPa).
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Al Sn Zn solid solutions form and disperse in the brazing zone of the Mg/Sn 30Zn/Al brazed joint, decreasing the risk of embrittlement of the brazed joint.
The shear strength of the brazed joint is 47.9% higher than that of joints brazed with single Ag Cu Ti+TiNp filler when a 200 μm thick Cu interlayer is used.
The average microhardness for laser brazed joint was 150 HV compared to 120 HV for furnace brazed joint.
The method is illustrated for a brazed joint.
The typical microstructure of brazed joint was graphite/TiC/β-Sn containing Ti6Sn5/TiC/graphite.
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