Intermetallics evolution and fracture behavior of Nb interlayer inserted Si3N4/Ti joints brazed with AgCuTi filler

Ong, Fei Shen; Tobe, Hirobumi; Satô, Eiichi

doi:10.1016/j.msea.2019.138096

Cited by 31 publications

(4 citation statements)

References 42 publications

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“…Xing et al [25] concluded that the Nb foil addition could effectively relax the residual stress of the graphite/Cu joint by its plastic deformation. Ong et al [26] presented that the Nb interlayer with good ductility could alleviate the residual thermal stress of the Si 3 N 4 /Ti joint using Ag-Cu-Ti + Nb filler. Therefore, the Nb foil application in graphite/Mo joining may contribute to the joint residual stress relief and thus giving rise to the joint strength improvement.…”

Section: Mechanical Characterisationsmentioning

confidence: 99%

Joining of graphite to Mo using Ti/Cu and Ti/Cu/Nb/Ti/Cu foils

Xu,

Huang,

Jiang

et al. 2023

Science and Technology of Welding and Joining

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Graphite/Mo joining has been carried out using Ti/Cu or Ti/Cu/Nb/Ti/Cu foils. The joining region in the joint using Ti/Cu foils is mainly composed of Ti 3 Cu 4 and TiCu. The joining region using Ti/Cu/Nb/Ti/Cu foils contains a joining zone I, an Nb interlayer and a joining zone II. Both the joining zones I and II are made up of Ti 3 Cu 4 and TiCu. The Nb foil diffuses and dissolves into the liquid fillers during the bonding. The joint using Ti/Cu/Nb/Ti/Cu foils shows higher shear strength than that using Ti/Cu foils, implying the contribution of Nb foil to the joint stress relief and to the joint strength promotion.

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Section: Mechanical Characterisationsmentioning

confidence: 99%

Joining of graphite to Mo using Ti/Cu and Ti/Cu/Nb/Ti/Cu foils

Xu,

Huang,

Jiang

et al. 2023

Science and Technology of Welding and Joining

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“…Ong et al pointed out that ductile Nb interlayer can lessen the residual stress of Si 3 N 4 /Ti joint. [43] Meanwhile, it can reduce Ti-based intermetallics' formation by inhibiting Ti diffusion into Si 3 N 4 substrate. As shown by Oliveira et al, Nb interlayer worked as a diffusion barrier to hinder brittle intermetallics formation in NiTi/TC4 joining.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

Effect of Nb or Ta Interlayer on Microstructure and Mechanical Properties of Graphite/Ti6Al4V Alloy Joints

Mao

Duan

et al. 2021

Adv Eng Mater

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Graphite/Ti6Al4V (TC4) joining has been conducted with Cu–Ti–Ni filler and refractory metal (Nb or Ta) interlayer. Microstructural characterizations reveal that defect‐free interfaces are obtained among the refractory metal interlayer, fillers, and substrates, suggesting favorable interfacial bonding in the joints. The diffusion and dissolution of Nb or Ta atoms into the molten fillers occur during joining, leading to the formation of (Ti, R) solid solution ([Ti, R]ss, R = Nb, or Ta) in the filler layers and thickness decrease in the interlayer. Two filler layers adjacent to the interlayer primarily consist of Ti–Cu, Ti–Cu–Ni intermetallics, and (Ti, R)ss. A Ti‐rich diffusion layer and a thin TiC‐containing layer exist near TC4 and graphite substrates, respectively. The joints brazed with Nb and Ta interlayers exhibit shear strength of 2 1.0 ± 2.7 MPa and 20.2 ± 3.1 MPa, respectively, both higher than those without interlayer, implying that the introduction of refractory metal interlayer may benefit the joint stress relaxation by its intermediate coefficient of thermal expansion and high ductility. The joint strength with Nb interlayer is slightly higher than that with Ta interlayer, mainly attributed to the relatively lower elastic modules and yield strength of Nb.

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“…G. Song et al [23] successfully brazed TiAl based alloy and Si 3 N 4 ceramics with AgCuTi filler, and the maximum shear strength reached 115 MPa. Compared with the traditional AgCu filler, the active filler AgCuTi has good ductility and wettability [24][25][26], which makes the Si 3 N 4 ceramic and alloy form a good structure. In view of this, this paper uses AgCuTi filler to connect TiZrHfNbMo high-entropy alloy and Si 3 N 4 ceramic, in order to solve the two main problems of poor wettability and large residual stress.…”

Section: Of 12mentioning

confidence: 99%

Microstructure and Shear Strength of Brazing High Entropy TiZrHfNbMo Alloy and Si3N4 Ceramics Joints

et al. 2021

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The effects of different brazing processes on the interfacial microstructure and shear strength of TiZrHfNbMo high-entropy alloy (HEAS) and Si3N4 ceramic brazed joints were studied. There is no obvious defect in a brazed TiZrHfNbMo HEAS/AgCuTi/Si3N4 ceramic joint, and the two materials have good metallurgical bonding. The typical interface microstructure is Si3N4/Ti5Si3/Ag solid solution +Cu (s,s)+ CuTi/Cu2Ti/Cu4Ti + TiCu(Hf,Zr)NbMo/TiZrHfNbMo HEAs. With the increase of brazing temperature, the dispersed CuTi phase agglomerates in the brazed joint, and acts as the nucleate of the Cu-based solid solution. The thickness of the reaction layer increases with the increase of phases in the reaction layer on both sides of the joint. When the brazing temperature is 800 °C, 820 °C, 840 °C and 860 °C, the shear strength of the brazed joint is 30 MPa, 72 MPa, 86 MPa and 21 MPa, respectively. The formation of CuTi and Ti5Si3 intermetallic compounds increases the thickness of the reaction layer, and improves the strength of the joint. However, excessive CuTi and Ti5Si3 intermetallic compounds lead to a significant decrease in joint strength. The grain coarsening of the joint can also affect the strength of the joint.

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Intermetallics evolution and fracture behavior of Nb interlayer inserted Si3N4/Ti joints brazed with AgCuTi filler

Cited by 31 publications

References 42 publications

Joining of graphite to Mo using Ti/Cu and Ti/Cu/Nb/Ti/Cu foils

Joining of graphite to Mo using Ti/Cu and Ti/Cu/Nb/Ti/Cu foils

Effect of Nb or Ta Interlayer on Microstructure and Mechanical Properties of Graphite/Ti6Al4V Alloy Joints

Microstructure and Shear Strength of Brazing High Entropy TiZrHfNbMo Alloy and Si3N4 Ceramics Joints

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