Evaluation of copper brazed joint failure by thermal-fatigue test applicable in heat exchangers

Tajfar, M.; Ganjeh, E.; Mirbagheri, Mohammadreza

doi:10.1016/j.jallcom.2015.09.276

Cited by 8 publications

(2 citation statements)

References 12 publications

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“…Ag-based brazing filler metals have moderate melting points, excellent wetting and spreading properties as well as good thermal conductivity, electric conductivity and corrosion resistance, which make them the most suitable brazing filler metals for the joining of metals such as copper, iron, stainless steel and hard alloys [1][2][3]. Among them, the AgCuZnCd-series filler metals were the most widely used in the past [4][5][6], but the application of Cd-containing filler metals has been restricted due to the toxicity of Cd [7,8]. Moreover, the price of Ag is high, resulting in serious cost pressure on the Ag brazing filler metal industry.…”

Section: Introductionmentioning

confidence: 99%

Effects of In and Ga on Spreading Performance of Ag10CuZnSn Brazing Filler Metal and Mechanical Properties of the Brazed Joints

Zhang,

Xu,

et al. 2023

Crystals

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Ag-based brazing filler metals are preferred in many industries, but the high price of Ag restricts their wider application. Therefore, developing novel low-Ag brazing filler metals has aroused extensive interest. In this study, the effects of the In and Ga elements on the melting behavior and spreading property of Ag10CuZnSn filler metal and the microstructure and strength of the brazed joints were investigated. The results show that both In and Ga can significantly decrease the solidus and liquidus temperatures of the filler metal. The In element can dissolve into the liquid filler metal and the Ga element can decrease the surface tension of the melted filler metal, which, in turn, improves the spreading area. The In element prefers to dissolve into the Ag-rich phase, and the Ga element prefers to dissolve into the Cu-rich phase; both improve the strength of the filler metal through solid-solution strengthening. The shear strength of the 304 stainless-steel brazed joint reached a peak value of 396 MPa when the Ag10CuZnSn-1.5In-2Ga (wt%) filler metal was used. However, the excessive addition of In and Ga forms brittle intermetallic compounds (IMCs) in the brazing seam, which decreases the strength of the brazed joint.

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Section: Introductionmentioning

confidence: 99%

Effects of In and Ga on Spreading Performance of Ag10CuZnSn Brazing Filler Metal and Mechanical Properties of the Brazed Joints

Zhang,

Xu,

et al. 2023

Crystals

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“…Due to their relatively low melting point, superior wetting and spreading performance on most metals and alloys, high mechanical properties, and good electrical and thermal conductivities, the Ag-based brazing filler metals have been used in the fields of aerospace, household appliances, the automotive industry, refrigeration valves, hardware products, the military industry, and so on [1,2]. Among them, the AgCuZnCd series brazing filler metals have the best brazeability and can be used to braze nearly all ferrous and nonferrous metals [3]. The Cd element can not only decrease the melting point and the melting temperature range of the AgCuZn filler metals, but also improve their wetting and spreading performances [4].…”

Section: Introductionmentioning

confidence: 99%

Combined Effect of In and Ce on Microstructure and Properties of Ag10CuZnSn Low-Silver Brazing Filler Metals

Xu,

Fu,

Yang

et al. 2023

Crystals

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In this study, trace amounts of In and Ce elements were composite added into a Ag10CuZnSn low-silver brazing filler metal, and the effects of the composite alloying on the solidus and liquidus temperatures, the spreading performance, the microstructure of the filler metal, and the mechanical properties of the joints prepared with these filler metals were studied. The results reveal that the In element can significantly decrease the solidus and the liquidus temperatures of the Ag10CuZnSn alloy, while the Ce element has little effect on the melting temperature. Trace amounts of In and Ce elements can obviously increase the spreading areas of the filler metals on the pure Cu and 304 stainless steel base metals. The In and Ce elements can refine the microstructure of the filler metals. When the contents of In and Ce are 1.5 wt% and 0.15 wt%, respectively, the microstructure refinement effect is the most obvious, and the shear strength of the 304 stainless steel brazed joint also achieves a maximum value of 375 MPa. Excessive addition of In and Ce can form brittle intermetallic compounds in the filler metal, decreasing the brazed joints' shear strength.

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Determination of Joint Defects in Copper Tube Induction Heating Brazing Area Using Infrared Thermal Image Based on CNN Algorithm

Lee,

Kim

et al. 2024

Int. J. Precis. Eng. Manuf.

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Evaluation of copper brazed joint failure by thermal-fatigue test applicable in heat exchangers

Cited by 8 publications

References 12 publications

Effects of In and Ga on Spreading Performance of Ag10CuZnSn Brazing Filler Metal and Mechanical Properties of the Brazed Joints

Effects of In and Ga on Spreading Performance of Ag10CuZnSn Brazing Filler Metal and Mechanical Properties of the Brazed Joints

Combined Effect of In and Ce on Microstructure and Properties of Ag10CuZnSn Low-Silver Brazing Filler Metals

Determination of Joint Defects in Copper Tube Induction Heating Brazing Area Using Infrared Thermal Image Based on CNN Algorithm

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