Reactive infiltration of silicon melt through microporous amorphous carbon preforms

Sangsuwan, P.; Tewari, Surendra N.; Gatica, Jorge E.; Singh, Mrityunjay; Dickerson, Robert M.

doi:10.1007/s11663-999-0099-1

Cited by 72 publications

(36 citation statements)

References 10 publications

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“…As evidenced in Figure 2, the values relative to the surface tension, the density and the dynamic viscosity are very scattered. From these values, the capillary infiltration data can be analyzed using the Washburn equation (Equation 1) relative to the porosity radius: [42][43][44][45] …”

Section: Background On the Capillary Infiltration Of Silicon Into Pormentioning

confidence: 99%

SiC/Si composites elaboration by capillary infiltration of molten silicon

Roger

Guesnet

Marchais

et al. 2018

Journal of Alloys and Compounds

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Infiltration of molten metal into ceramic performs without external pressure is a promising fabrication method for metal-matrix composites. Thus, this research is focused on the kinetic of capillary infiltration in the processing of Si/SiC composites. The calculation of the infiltration kinetics for a liquid in a porous material is possible by applying the modified-Washburn equation which involves the effective diameter of the pores. This equation implies a K value depending on the wetting angle, the density, the viscosity and the surface tension of the liquid at a given temperature. In this study, the main aim was to measure the K Si value of molten silicon infiltration into porous SiC at 1500°C. On this way, consolidated β-SiC powder compacts were prepared for infiltration experiments. The effects of the SiC particles presintering on the pore size were examined as they can affect molten silicon infiltration. So, the monitoring of the mass increase during hexadecane rise was used to determine the effective diameter of the pores. It was evidenced that an increase of 15.5% of the initial effective diameter occurs. Consequently, a corresponding correction has to be applied to the initial effective diameter of the siliconinfiltrated compacts. Infiltrations of pure molten silicon into SiC compacts were successfully carried out at 1500°C under high vacuum (5.10 -3 mbar) and the average value of K Si was found equal to (5.8±0.4)×10 -6 cm 5 .s.g -2 . The effect of molten silicon rise on the porosity was also considered.

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Section: Background On the Capillary Infiltration Of Silicon Into Pormentioning

confidence: 99%

SiC/Si composites elaboration by capillary infiltration of molten silicon

Roger

Guesnet

Marchais

et al. 2018

Journal of Alloys and Compounds

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“…For a long time, infiltration of Si and silicon rich alloys into porous carbon has been described as consisting of rapid, non-reactive, infiltration obeying Washburn's equation followed by the reaction between Si and C to form SiC [30][31][32]. Three experimental facts disagree with this model: (i) Infiltration of porous graphite by Si and NiSi alloys rich in silicon does not show a parabolic trend as predicted by Wasbhurn's equation, but is linear with time ( Figure 15) (ii) Si does not wet unreacted carbon substrates as shown by the large obtuse θ0 value in the curve of Figure 6.…”

Section: Wetting In Infiltrationmentioning

confidence: 99%

Wetting by Liquid Metals—Application in Materials Processing: The Contribution of the Grenoble Group

Eustathopoulos

2015

Metals

133

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Abstract:The wettability of ceramics by liquid metals is discussed from both the fundamental point of view and the point of view of applications. The role of interfacial reactions (simple dissolution of the solid in the liquid or formation of a layer of a new compound) is illustrated and analysed. Several results are presented in order to illustrate the role of wettability in materials processing, namely infiltration processing, joining dissimilar materials by brazing and selecting crucibles for crystallising liquid metals and semiconductors. The review includes results obtained during the last 15 years mainly, but not only, by the Grenoble group.

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“…[19,20] In these studies, the role of the liquidphase surface tension on the critical velocity of a ceramic particle, which enabled it to penetrate the liquid film, is well established. Although the physics of the current work is different, these earlier studies provide ideas about the importance of surface tension as a factor in determining whether a particle will adhere to a filter web.…”

Section: Literature Reviewmentioning

confidence: 99%

Simulation of Fluid and Inclusions Dynamics during Filtration Operations of Ductile Iron Melts Using Foam Filters

Dávila-Maldonado

Adams²,

Oliveira

et al. 2008

Metall Mater Trans B

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The use of ceramic foam filters in ductile iron foundries to reduce the number of inclusions that reach the casting has been widely accepted. However, the exact mechanisms contributing to foam filter effectiveness are not yet known; this limits the ability to maximize filter performance and inclusion reduction. The objective of this work is to qualify and quantify the effects of the foam filter structure on inclusion retention. This has been accomplished through the development of a three-dimensional (3-D) mathematical model, based on physical water modeling and mathematical simulations. It was found that the casting rate and inclusion density play minor roles in the capture ratio, while inclusion size is the most influent variable. One mechanism for capturing inclusions involves the direct impact of an inclusion on the web wall and its adhesion after crossing over the liquid film. Two additional mechanisms involve the entrainment of inclusions by buoyancy-lift forces into low-velocity fields and the ulterior adhesion through buoyancy effects. The second mechanism is the entrainment of inclusions into microrecirculating flows; the inclusions remain in these flows for times that exceed the mold filling time. The latter mechanism has limited intensity for inclusions approximately 30 to 100 lm in size. In order to enhance the effects of this mechanism in this range of sizes, the vorticity magnitude in the microfree shear flows in the filter's pores must be increased, through changes in the structure geometry of this device.

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Reactive infiltration of silicon melt through microporous amorphous carbon preforms

Cited by 72 publications

References 10 publications

SiC/Si composites elaboration by capillary infiltration of molten silicon

SiC/Si composites elaboration by capillary infiltration of molten silicon

Wetting by Liquid Metals—Application in Materials Processing: The Contribution of the Grenoble Group

Simulation of Fluid and Inclusions Dynamics during Filtration Operations of Ductile Iron Melts Using Foam Filters

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