Interfacial behavior in the brazing of silicon nitride joint using a Nb-foil interlayer

Ceja-Cárdenas, L.; Lemus‐Ruiz, José; Torre, S.D. De la; Escalona-González, Ricardo

doi:10.1016/j.jmatprotec.2012.09.019

Cited by 17 publications

(7 citation statements)

References 17 publications

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“…Ceja-Cárdenas et al presented that the diffusion rate of Cu in Nb was very low at 1000 C in Si 3 N 4 /AISI-304 stainless steel joining with Cu-Zn filler and Nb foil. [24] On the contrast, Nb is infinitely miscible in β-Ti based on Ti-Nb phase diagram (Figure 1b). Therefore, Nb can largely dissolve in β-Ti at the temperature higher than 882 C (α-Ti!β-Ti phase transformation temperature).…”

Section: Joint Microstructure With Nb Interlayermentioning

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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Section: Joint Microstructure With Nb Interlayermentioning

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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“…In most cases, ceramics must be joined to metals with sufficient bond strength because the poor workability and brittleness of ceramics can be compensated by the metal. Ceja-Cárdenas et al (2013) recognized the development of diverse Nb-silicide´s in the course of bonding Si 3 N 4 to Nb-foil interlayer and using a Cu-Zn foil as joining element by brazing. This may cause the development of tensions at the interface that could result in a premature failure of the joint.…”

Section: Introductionmentioning

confidence: 99%

RESISTENCIA AL CORTE DE UNIONES Al 2 O 3 -Nb PRODUCIDAS POR SOLDADURA FUERTE USANDO UNA ALEACIÓN Cu-Zn COMO ELEMENTO DE UNIÓN

Lemus‐Ruiz¹

2022

JER

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Metal brazing is a widely used technique to join advanced ceramics and metal. In this study, we have investigated the microstructure and mechanical properties of Al 2 O 3 /Nb joint brazed using a 70Cu-30Zn alloy as joining element. Cylindrical Al 2 O 3 disks were produced by sintering of powder at 1550°C and the Al 2 O 3 /Cu-Zn/Nb/Cu-Zn/ Al 2 O 3 arrangements were bonded at 920°C to 980°C in argon atmosphere. Effective bonding of Al 2 O 3 to Nb was observed at 950°C and 980°C, however joining was not possible at 920°C. Scanning electron micrographs of the reaction layer show the growth of the interface zone increasing with both bonding temperature and time. Evidence of Nb diffusion towards the joining element forming spherical Nb-rich precipitates near to the Al 2 O 3 bonding line was evident from the SEM observations. Mechanical characterization of the joints at 980°C showed shear stress results varying from 57 to 127 MPa in samples joined for different times.

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“…A considerable amount of literature has been published on strategies to relax the residual stress in ceramic/metal brazing joint. Three most commonly used methods are: (i) by applying a soft and ductile interlayer such as copper foil 11 , foam 12 and niobium foil 13 which could release the residual stress in the joint via plastic deformation. This method is considered to be of limited success because the soft interlayer usually has relatively low melting temperature and the addition of the interlayer will inevitably be detrimental to the high temperature mechanical properties of the joint 14 .…”

Section: Introductionmentioning

confidence: 99%

Understanding the Effect of Surface Machining on the YSZ/Ti6Al4V Joint via Image Based Modelling

Dai

et al. 2019

Sci Rep

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A method to improve the brazing between YSZ and Ti6Al4V by femtosecond laser surface machining is introduced. The highest strength of ~150 MPa (which is 95.2% higher than that of the flat YSZ/Ti6Al4V joint) is achieved when the processing speed is 200 μm/s. To understand the strengthen mechanism of the surface machining on the joint strength, image based models, based on the observed microstructure, have been used to probe the stress distribution in the joint. It is found that through surface machining on the ceramic, the residual stress distribution in ceramic becomes nonlinear. Upon shear testing, for the joint with a flat interface, the failure happens in the reaction layer and the out of plane stress in this layer is found to be tensile, which acts as the driving force for the crack generation and propagation. But for the joint with a rumpled interface, the compressive out of plane stress at the boundary of the grooves in the reaction layer could inhibit the propagation of the cracks. Finally, by surface machining on the ceramic, the maximum shear stress in the reaction layer is decreased, which could also help to improve the reliability of the joint.

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Interfacial behavior in the brazing of silicon nitride joint using a Nb-foil interlayer

Cited by 17 publications

References 17 publications

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

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

RESISTENCIA AL CORTE DE UNIONES Al 2 O 3 -Nb PRODUCIDAS POR SOLDADURA FUERTE USANDO UNA ALEACIÓN Cu-Zn COMO ELEMENTO DE UNIÓN

Understanding the Effect of Surface Machining on the YSZ/Ti6Al4V Joint via Image Based Modelling

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