Study of the microstructure and thermomechanical properties of Mo/graphite joint brazed with Ti–Zr–Nb–Be powder filler metal

Fedotov, Ivan; Сучков, А. Н.; Слива, А. П.; Джумаев, П. С.; Kozlov, Ilya; Светогоров, Р. Д.; Bachurina, Diana; Sevryukov, O. N.

doi:10.1007/s10853-021-06015-9

Cited by 10 publications

(6 citation statements)

References 28 publications

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“…Thermocycling tests are very important while developing brazing processes, because phase transformation or a joint degradation can occur [41,42]. In this work we carried out the thermocycling test in an evacuated quartz ampoule with dynamic vacuum of p = 10 −2 mmHg; to suppress oxygen concentration, titanium getter was also inserted into the ampoule.…”

Section: Methodsmentioning

confidence: 99%

Brazing Tungsten/Tantalum/RAFM Steel Joint for DEMO by Fully Reduced Activation Brazing Alloy 48Ti-48Zr-4Be

Bachurina

Сучков

Gurova

et al. 2021

Metals

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To create a DEMO reactor, it is necessary to develop high-quality technology to join tungsten with reduced-activation ferritic-martensitic (RAFM) steel (Rusfer, Eurofer, CLF-1, etc.). Difficulties arise in their direct connection due to the large difference in the coefficient of thermal expansion (CTE). To suppress the difference of CTE, intermediate interlayers are usually used, such as vanadium or tantalum, and brazing is a prospective technology to conduct the joining. The vast majority of works represent copper- or nickel-based brazing alloys, but their applicability is under significant discussion due to their activation properties. That is why, in this work, fully reduced activation 48Ti-48Zr-4Be wt.% brazing alloy was used. The following joint was made: Rusfer steel/48Ti-48Zr-4Be/Ta/48Ti-48Zr-4Be/W. The brazing was successfully carried out under a mode providing thermal heat treatment of Rusfer. Through EDS and EBSD analysis, the microstructure of the joint was determined. Shear strength of the as-joined composition was measured as 127 ± 20 MPa. The joint endured 200 thermocycles in the temperature range between 300–600 °C, but the fillet regions degraded.

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Section: Methodsmentioning

confidence: 99%

Brazing Tungsten/Tantalum/RAFM Steel Joint for DEMO by Fully Reduced Activation Brazing Alloy 48Ti-48Zr-4Be

Bachurina

Сучков

Gurova

et al. 2021

Metals

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“…The Ti-Zr filler reacted with the graphite and Mo to form compounds and solid solutions, respectively, consequently contributing to the effective joining of graphite to Mo. Fedotov et al [3] brazed graphite to Mo with Ti-Zr-Nb-Be filler at 1400°C. The joint maintained integrity and showed high stability after mechanical and simulated heating tests.…”

Section: Introductionmentioning

confidence: 99%

“…In view of the problems in the previous study on graphite/Mo joining including high pressure (0.1 MPa for diffusion bonding [2] and 0.5-1.0 MPa for vacuum arc pressure brazing [1]), high joining temperature (1650°C for diffusion bonding [2] and 1350-1680°C for brazing with Ti-containing fillers [3,4]), and the toxicity of Be in the Ti-Zr-Nb-Be filler, it is meaningful to join graphite to Mo with non-toxic filler at relatively low joining temperature and pressure.…”

Section: Introductionmentioning

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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“…Brazing of graphite can be performed by preliminary metalizing of the surface being brazed (plasma or electrolytic methods) with further application of the ductile inactive brazing filler metals [6] as well as without coating, but using adhesion-active brazing filler metals. Currently, the commonly used filler metals include Ti-(Zr)-based [12][13][14], Cu-and Cu-Ag-based [15][16][17][18] brazing filler metals, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Selection of the brazing filler metal requires using carbide-forming elements, having a chemical interaction with carbon, and forming carbide compounds at the interface during active brazing. The latter contains elements (Ti, Zr, Cr, Ta, Nb, V, Hf) having a high chemical affinity with carbon and forming with them strong adhesive bonds [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Structure and Properties of Graphite-Molybdenum Brazed Joints

S. Maksymova,

V. Voronov,

P. Kovalchuk

et al. 2023

Metall Mater Eng

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The paper presents the results of X-ray microspectral studies of dissimilar brazed joints of molybdenum with graphite. It is shown that during active brazing of graphite with molybdenum, mutual diffusion processes occur, and the adhesion-active brazing filler metals penetrates into graphite, and interacts with it, which leads to the formation of carbide phases. When using the Ti-Cr-V and Cu-Ti-Ni systems brazing filler metals, titanium carbides are formed. The zirconium carbides are formed, when using the brazing filler metals based on the Zr-Pd(Mo) systems and the CxMey(Mo, Cr) carbides are formed using the brazing filler metals of the Pd-Ni-Cr-Ge system. The results of tests for three-point bending showed that the using of Pd-Ni-Cr-Ge brazing filler metals provides stable strength at the level of 34-37 MPa, destruction occurs along graphite.

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Study of the microstructure and thermomechanical properties of Mo/graphite joint brazed with Ti–Zr–Nb–Be powder filler metal

Cited by 10 publications

References 28 publications

Brazing Tungsten/Tantalum/RAFM Steel Joint for DEMO by Fully Reduced Activation Brazing Alloy 48Ti-48Zr-4Be

Brazing Tungsten/Tantalum/RAFM Steel Joint for DEMO by Fully Reduced Activation Brazing Alloy 48Ti-48Zr-4Be

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

Structure and Properties of Graphite-Molybdenum Brazed Joints

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