Prediction of Si contents to suppress the formation of Al4C3 in the SiCp/Al composite

Lee, Jae Chul; Byun, Ji Young; Park, Sung Bae; Lee, Ho In

doi:10.1016/s1359-6454(97)00265-6

Cited by 145 publications

(65 citation statements)

References 14 publications

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“…However, spontaneous infiltration is believed to be a promising route for the fabrication of SiC reinforced metal-matrix composites owing to its advantages of simple equipment, low cost and the near-to-shapes complex parts [9][10][11][12]. Silicon is commonly used as alloy element to copper and aluminum to enhance the wettability and to limit the reactivity between ceramic and liquid metal [6,[12][13][14]. On this way, one can easily consider the possibility to use melt silicon as liquid metal.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…The reaction is thermodynamically possible because the standard free energy change for this reaction is negetive and Al 4 C 3 and Si are the two major interfacial reaction products [28,34,36].…”

Section: -2-reaction Between Aluminum Matrix and Sic Particlesmentioning

confidence: 99%

Stir casting process for manufacture of Al–SiC composites

et al. 2015

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Stir casting is an economical process for the fabrication of aluminum matrix composites. There are many parameters in this process, which affect the final microstructure and mechanical properties of the composites. In this study, micron-sized SiC particles were used as reinforcement to fabricate Al-3 wt% SiC composites at two casting temperatures (680 and 850 °C) and stirring periods (2 and 6 min). Factors of reaction at matrix/ ceramic interface, porosity, ceramic incorporation, and agglomeration of the particles were evaluated by scanning electron microscope (SEM) and high-resolution transition electron microscope (HRTEM) studies. From microstructural characterizations, it is concluded that the shorter stirring period is required for ceramic incorporation to achieve metal/ceramic bonding at the interface. The higher stirring temperature (850 °C) also leads to improved ceramic incorporation. In some cases, shrinkage porosity and intensive formation of Al4C3 at the metal/ceramic interface are also observed. Finally, the mechanical properties of the composites were evaluated, and their relation with the corresponding microstructure and processing parameters of the composites was discussed. AbstractStir casting is an economical process for fabricating aluminium matrix composites. There are

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“…As demonstrated formerly, aluminum carbide which formed locally at the interfacial surface of matrix/fiber as needle-like affected the surface quality of C sf , thermal conductivity and mechanical properties are due to the low capability of load transferring from matrix to fibers. Silicon content in aluminum alloy (having at least 7 wt.%) is a dual action element which improves the adherence and prevents the formation of aluminum carbide especially at temperatures up to 750 °C [22]. In this method, the high concentration of silicon in the eutectic might be helpful to overcome the problem in order to the lack of wettability between the carbon fiber and aluminum and will be discussed later.…”

Section: The Effect Of Temperature and Speed Of Mixing On Thixomixingmentioning

confidence: 99%

Microstructure and properties of aluminum silicon/short fibre carbon composites fabricated by semi-solid thixomixing

2015

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A novel method was developed, based on thixotropic nature of semi-solid slurry of aluminum silicon alloy, for the effective dispersion and distribution of short carbon fibers (C sf ) under intensive shear stress (τ) into the eutectic without physical or chemical damage.The C sf were distributed homogeneously into the matrix at optimum conditions: a temperature of 576-580 °C, around 48% of solid fraction, and rotation speed of mixing was at 100 rpm. The gas entrapment and porosity was a challenge in the fabrication the aluminum composite by thixomixing, and its size increased when the samples were heat treated. The extruded and heat treated composites had around 24% improvement of mechanical strength as assessed by tensile tests. The predominant deposition of silicon and its intermetallics at the interfacial region improved the wettability and adherence to achieve good mechanical properties. The formation of some intermetallics can be helpful to overcome low wettability effects and their structural evolutions were impressive. The fractography analysis illustrated the ductile fracture with some plastic deformation as the results of dimples and some fiber pull-out in the fractured surface. Ultra-micro hardness evaluation showed good interfacial bonding after heat treatment. The thixomixing process can be developed to produce various composites with different reinforcement.

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Prediction of Si contents to suppress the formation of Al4C3 in the SiCp/Al composite

Cited by 145 publications

References 14 publications

SiC/Si composites elaboration by capillary infiltration of molten silicon

SiC/Si composites elaboration by capillary infiltration of molten silicon

Stir casting process for manufacture of Al–SiC composites

Microstructure and properties of aluminum silicon/short fibre carbon composites fabricated by semi-solid thixomixing

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