Effect of Ni on the wetting and brazing characterization of 304 stainless steel by Ag–Cu alloy

Mu, Guoqian; Qu, Wenqing; Zhang, Yanhua; Zhuang, Hongshou

doi:10.1007/s10853-023-08372-z

Cited by 5 publications

(3 citation statements)

References 30 publications

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“…Poor wettability is a common problem in Cu/steel joining. Nickel plating on the base material [12] and selecting suitable brazing filler metal [23] are common methods to improve wettability. The most effective way to improve joint wettability is by alloying elements into the filler metal.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, many brazing materials such as Ag, Cu, and Ni-base have been used for Cu/steel joining. According to the research of Mu et al [23], it can be solved by using Ag-Cu filler metal containing Ni element. Due to the strong affinity of Ni with Cu and Fe, adding Ni to Ag-based brazing materials can effectively improve joint wettability during Cu-steel welding [24,25].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and mechanical behaviors of Gasar porous Cu/G4335V steel joint brazed by Ag-28Cu-0.75Ni alloy

Zhang,

Xia,

Wang

et al. 2024

Mater. Res. Express

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Cu/steel composites have the advantages of low cost and high heat dissipation performance, which make them ideal materials for applications in the industrial heat dissipation field. Because of the unique pore structure, the Gasar porous Cu is more excellent in heat transfer performance. However, systematic research still needs to be done on the joining technologies of Gasar porous Cu/steel. In this paper, Gasar porous Cu was joined to G4335V steel using Ag-28Cu-0.75Ni. The microstructure, shear strength, and fracture behavior of the Gasar porous Cu/G4335V steel joint were investigated. The results show that a clear interface of the brazed joint and no brazing defects were found. The joint microstructure mainly comprises α-Cu (ss.), β-Ag (ss.), and Ag-Cu eutectic phase. As the pore diameter of Gasar porous Cu increased, the joining area of the Gasar porous Cu/G4335V steel joint became larger, thereby improving the shear strength of the joint. For the same pore diameter, the shear strength of the mode 1 joint (The load direction and the pore direction are parallel to each other. The pore direction refers to the growth direction of the pore.) was higher than that of the mode 2 joint (The pore direction and the load direction are perpendicular to each other). The fracture analysis indicated that the joint crack was initiated in α-Cu (ss.) and propagated along the banded α-Cu (ss.). The joint fracture was a mixed fracture mechanism that combined ductile-brittle fractures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical behaviors of Gasar porous Cu/G4335V steel joint brazed by Ag-28Cu-0.75Ni alloy

Zhang,

Xia,

Wang

et al. 2024

Mater. Res. Express

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show abstract

“…Therefore, substitutes with the representation of silver-based solder have been attracted attention recently [8]. Among them, the eutectic and near-eutectic Ag-Cu alloys have attracted considerable attention owing to their high strength and high electrical conductivity [9,10]. Ag-Cu-Sn-based alloys have been used in industrial applications as brazing/soldering alloys due to their excellent mechanical properties [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Phase Transition of Ag50.5Cu33.3Sn16.2-xInx Alloys through Experimental Study and Thermodynamic Calculation

Tong

Rong

Wang

2023

Metals

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In this study, the solidified microstructure and phase transition temperatures of Ag50.5Cu33.3Sn16.2-xInx (x = 5.0, 6.6, 8.2, 9.1, 9.9, 10.7, 11.5, 12.3; at.%) alloys were investigated using a scanning electron microscope with energy dispersive spectrometer (SEM-EDS) and differential thermal analysis (DTA). The experimental microstructure of Ag50.5Cu33.3Sn16.2-xInx alloys demonstrates that the phase fraction of Fcc(Ag) phase increased gradually as the addition of In increased, while the phase fraction of Fcc(Cu) phase decreased. Moreover, the liquidus temperatures of Ag50.5Cu33.3Sn16.2-xInx alloys also decrease with increasing In content. In this work, the Ag-Cu-Sn-In quaternary thermodynamic database was ideally extrapolated from the published literature for Ag-Cu-Sn, Ag-Cu-In, Ag-Sn-In and Cu-Sn-In thermodynamic databases. The calculated vertical section of Ag50.5Cu33.3Sn16.2-Ag50.5Cu33.3In16.2 agreed generally with the phase transition temperatures measured in the present experiment. Finally, the solidification behaviors of Ag50.5Cu33.3Sn16.2-xInx as-cast alloys were analyzed by thermodynamic calculation of the Scheil–Gulliver non-equilibrium model. The simulated solidification processes of some Ag50.5Cu33.3Sn16.2-xInx alloys are, in general, consistent with the experimental results in the present work, which would provide a theoretical basis for the design of novel Ag-Cu-Sn-In brazing alloys.

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Effects of Cu Coating Addition on Mechanical Properties of Vacuum Brazed Joints

Wang,

Li,

Wei

et al. 2024

steel research int.

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In this study, a copper brazing filler metal coating is fabricated on a 304 stainless steel (304SS) substrate using an electroplating technique. The effect of using electroplated copper brazing filler metal coatings compared to pure copper foil of the same thickness for vacuum brazing of stainless steel joints is investigated. The microstructure and microhardness of the brazed joints are characterized using X‐ray diffraction (XRD), scanning electron microscopy (SEM), and a Vickers hardness tester. The shear strength of the brazed joints is measured using an INSTRON 5869 universal testing machine. The results indicate that the electroplated Cu coating is dense, predominantly with a single cubic phase, with a few copper particles aggregating on the surface. Under electroplating conditions of 20 mA cm−2 for 1 h, the coating thickness was 56 μm. The shear strength of the brazed joint with this coating reached a maximum of 333.7 MPa, which is higher than that of a brazed joint with a 60 μm thick copper foil, which exhibits a shear strength of 303.2 MPa. The shear strength of the brazed joints shows an initial increase followed by a decrease as current density and electroplating time increase. This study provides significant technical support for brazing complex shapes or precision components. It suggests a method to simplify the brazing process, reduce production costs, and enhance the strength of brazed joints.

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Effect of Ni on the wetting and brazing characterization of 304 stainless steel by Ag–Cu alloy

Cited by 5 publications

References 30 publications

Microstructure and mechanical behaviors of Gasar porous Cu/G4335V steel joint brazed by Ag-28Cu-0.75Ni alloy

Microstructure and mechanical behaviors of Gasar porous Cu/G4335V steel joint brazed by Ag-28Cu-0.75Ni alloy

Microstructure and Phase Transition of Ag50.5Cu33.3Sn16.2-xInx Alloys through Experimental Study and Thermodynamic Calculation

Effects of Cu Coating Addition on Mechanical Properties of Vacuum Brazed Joints

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