Numerical Simulation of Brazing Aluminium Alloys with Al–Si Alloys

Lacaze, Jacques; Jacques, Bruno; Mazet, Thierry; Vynnycky, Michael

doi:10.1007/s12666-018-1415-8

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Heating to the brazing upper temperature and cooling from it were both performed at a rate higher than 50 °C/min, which would be large enough that solid-state diffusion of silicon does not affect the amount of clad available [16].…”

Section: Model Summary and Numerical Solutionmentioning

confidence: 99%

On the modelling of joint formation in dissolutive brazing processes

Vynnycky

Lacaze

2019

J Eng Math

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In this paper, earlier dissolutive wetting models describing the dynamics of an axisymmetric alloy drop spreading on pure metal substrate are extended to describe reactive wetting and subsequent joint formation in brazing processes. A two-dimensional time-dependent problem is formulated, and the model equations are nondimensionalized, revealing the possibilities for asymptotic mode! reduction. Whilst the numerical solution of the time-dependent problem, which contains two moving contact lines and would not in general be amenable to lubrication theory, is relegated to future work, the steady-state problem is analyzed in detail. The analysis offers an arguably more transparent alternative to an earlier energy minimization approach for finding the location of the meniscus, which ultimately constitutes the joint. The results of the present mode! are found to compare favourably to those of earlier experimental and theoretical work.

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Section: Model Summary and Numerical Solutionmentioning

confidence: 99%

On the modelling of joint formation in dissolutive brazing processes

Vynnycky

Lacaze

2019

J Eng Math

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Computational prediction of surface-tension flow mechanism of molten filler in a V-shaped groove geometry in the brazing process of a heat exchanger

Otsuki,

Ishimoto,

Ogasawara

et al. 2023

Int J Adv Manuf Technol

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When the temperature rises during the brazing process, only the brazing material melts because of its low melting point. Several analytical approaches have been used to describe filler flow in channels and the progression of erosion grooves. However, only a few studies have examined filler-flow behavior in microgrooves during brazing. In this study, a computational model was constructed to examine the flow in microgrooves on an extruded material’s surface. The capillary flow of the aluminum brazing material was numerically analyzed to investigate the physical properties and surface behavior. Specifically, the surface-tension flow behavior was analyzed by simulating various cross-sectional shapes of the channel grooves and various contact angles of the filler. The effects of various parameters, such as viscosity and boundary conditions, on the filler flow were also analyzed. When the cross-sectional area of the channel groove increases, the filler-flow velocity increases, and the rate of unsteady fluctuation increases with the increasing filler tip velocity. The driving force of the filler flow in the channel groove is considered to be (1) the surface tension, which is based on the filler free-surface curvature, or (2) the dynamic change in the shape of the meniscus, which can be unsteady and induced by Rayleigh–Taylor instability. As the cross-sectional area of the channel groove increases, the capillary force based on the dynamic change in meniscus shape dominates the unsteady change in filler tip velocity, rather than the surface tension based on the filler free-surface curvature formed in the groove.

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Formation and Structure of Al–Si Layer on Contact Surface of Aluminium–Reactive Flux of KF–AlF$_3$–K$_2$SiF$_6$ System

Sabadash¹,

Maksymova²

2020

Metallofiz. Noveishie Tekhnol.

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При нагріванні реактивного флюсу системи KF-AlF 3-K 2 SiF 6 на алюмінієвій підкладці відбуваються два процеси: відновлення силіцію зі складу гексафторсилікату калію; контактно-реактивне топлення силіцію з алюмінієм. У результаті на реакційній поверхні формується шар зі стопу Al-Si, склад якого близький до заевтектичного, що підтверджено результатами мікрорентґеноспектрального аналізу. Мікроструктура закристалізованого металічного шару Al-Si містить зерна твердого розчину на основі Алюмінію і заевтектичну складову з концентрацією Силіцію (% мас.): 17,18 у міжзеренних ділянках, а також окремі дискретні вкраплення пластівчастої фази, що за стехіометричним складом близька до сполуки FeSiAl 5. Проведені порівняльні експерименти на графітовій підкладці показали, що вміст Силіцію у залишках флюсу після нагрівання відповідає його вмісту у вихідному складі флюсу. Ключові слова: реактивний флюс системи KF-AlF 3-K 2 SiF 6 , контактне топлення, Силіцій, Алюміній, металічний шар Al-Si. When heating the reactive flux of the KF-AlF 3-K 2 SiF 6 system on an aluminium substrate, two processes occur; reduction of silicon from potassium hexafluorosilicate; contact-reactive melting of silicon with aluminium. As a result, an Al-Si alloy layer is formed on the reaction surface, the composition

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Numerical Simulation of Brazing Aluminium Alloys with Al–Si Alloys

Cited by 3 publications

References 9 publications

On the modelling of joint formation in dissolutive brazing processes

On the modelling of joint formation in dissolutive brazing processes

Computational prediction of surface-tension flow mechanism of molten filler in a V-shaped groove geometry in the brazing process of a heat exchanger

Formation and Structure of Al–Si Layer on Contact Surface of Aluminium–Reactive Flux of KF–AlF$_3$–K$_2$SiF$_6$ System

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