The wettability of SiC particles by molten aluminium alloy

Hashim, J.; Looney, L.; Hashmi, M.S.J.

doi:10.1016/s0924-0136(01)00975-x

Cited by 346 publications

(187 citation statements)

References 28 publications

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“…[13] It was shown in our previous study [30] that magnesium is the best alloying element for incorporation of micronsized SiC particles into the melt of pure aluminum. Figure 5 shows the microstructure of sample S 2 , in which magnesium was added in chip form before ceramic addition.…”

Section: Resultsmentioning

confidence: 92%

“…Due to these advantages, they are used in aerospace industries (airframe and aerospace components), automobile industries (engine pistons), and electronic components. [1][2][3][4][5][6][7][8] Many techniques have been developed for producing particulate-reinforced AMMCs, such as stir casting, squeeze casting, [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and powder metallurgy. [19][20][21] Although each of these methods has its own advantages and disadvantages, they are all relatively expensive.…”

Section: Aluminum Metal Matrix Composites (Ammcs)mentioning

confidence: 99%

“…However, methods of achieving the following in stir casting are mostly to be considered: (i) no adverse chemical reaction between the reinforcement material and matrix alloy, (ii) no or very low porosity in the cast AMMCs, (iii) wettability between the two main phases, and (iv) achieving a uniform distribution of the reinforcement material. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] Some of the methods used to achieve these goals during stir casting of aluminum matrix composites are the modification of the alloy composition, coating or specific treatments to the reinforcements, and control of the process parameters (stirring temperature and time, etc.). [11][12][13][14] Among these, coating of the reinforcement is a successful technique used to prevent adverse interfacial reaction and promote wetting of the particles by aluminum through increasing the overall surface energy of the solid.…”

Section: Aluminum Metal Matrix Composites (Ammcs)mentioning

confidence: 99%

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A Novel Method for Incorporation of Micron-Sized SiC Particles into Molten Pure Aluminum Utilizing a Co Coating

Mohammadpour

Khosroshahi

Mousavian

et al. 2014

Metall Mater Trans B

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Ceramic particles typically do not have sufficiently high wettability by molten metal for effective bonding during metal matrix composite fabrication. In this study, a novel method has been used to overcome this drawback. Micron-sized SiC particles were coated by a cobalt metallic layer using an electroless deposition method. A layer of cobalt on the SiC particles was produced prior to incorporation in molten pure aluminum in order to improve the injected particle bonding with the matrix. For comparison, magnesium was added to the melt in separate experiments as a wetting agent to assess which method was more effective for particle incorporation. It was found that both of these methods were more effective as regard ceramic particulate incorporation compared with samples produced with as-received SiC particles injected into the pure aluminum matrix. SEM images indicated that cobalt coating of the particles was more effective than magnesium for incorporation of fine SiC particles (below 30 lm), while totally the incorporation percentage of the particles was higher for a sample in which Mg was added as a wetting agent. In addition, microhardness tests revealed that the cobalt coating leads to the fabrication of a harder composite due to increased amount of ceramic incorporation, ceramic-matrix bonding, and possibly also to formation of Al-Co intermetallic phases.

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Section: Resultsmentioning

confidence: 92%

Section: Aluminum Metal Matrix Composites (Ammcs)mentioning

confidence: 99%

Section: Aluminum Metal Matrix Composites (Ammcs)mentioning

confidence: 99%

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A Novel Method for Incorporation of Micron-Sized SiC Particles into Molten Pure Aluminum Utilizing a Co Coating

Mohammadpour

Khosroshahi

Mousavian

et al. 2014

Metall Mater Trans B

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“…In addition, wettability plays a key role in the improvement of reliability during application of these materials. The wettability of material interfaces has been studied widely in the field of material science [Conteras et al, 2003;Hashim et al, 2001].…”

Section: Relationship Between Wetting and Metal Matrix Compositesmentioning

confidence: 99%

“…Young-Dupre equation can be applied only to a flat surface and not to a rough one [Hashim et al, 2001]. The Young equation assumes a perfectly fiat surface, and in many cases surface roughness and impurities causes a deviation in the equilibrium contact angle from the contact angle predicted by Young's equation.…”

Section: Surface Roughnessmentioning

confidence: 99%

Investigation on wetting of B4C by aluminum alloys /

Sarkar¹

2009

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Aluminum-B4C composites (MMC) gained importance in aluminum industry because it can be used in high performance applications such as radioactive nuclear waste storage, aircraft and aerospace structures due to its neutron shielding capacity, light weight, high strength, and stiffness. It is difficult to mix B4C powder with liquid aluminum to produce composites due to poor wettability of B4C. In addition, B4C is not stable when it is in contact with aluminum. The optical microscopy and scanning electron microscopy analyses of the interface revealed the formation of AI3BC and AÎB2 particles around the B4C particle. This reaction is continuous and results in the depletion of B4C concentration, decrease in the fluidity of the melt, and deterioration in its mechanical and physical properties. To prevent B4C loss, titanium is added to aluminum. Ti has affinity to react with B4C and forms a protective layer around the particle.Objectives of this project are to investigate the wettability of B4C/aluminum and B4C/aluminum-titaniurn alloy systems, and to identify other potential alloying elements to protect B4C. The sessile-drop experiments have been conducted to measure the contact angles of B4C as well as those of the interfacial reaction products forming due to the presence of alloying elements in aluminum. Also, the effect of Ti content on the wettability of B4C by aluminum was studied.The results of the experiments show that the titanium and zirconium addition to aluminum has a strong positive effect on wetting between B4C particles and the liquid metal. In order to understand the effects of the reaction products on wetting, the contact angles between the reaction products (TiC, T1B2, AIB2 and AI4C3 particles) and aluminum have been measured at 750°C and 850°C. The results also show that wetting increases with increasing temperature and contact time.It is found out that with Ti addition, AIB2 particles disappear and new Ti-rich needle-like particles (TiB?) are formed around the B4C particles. These act as a barrier layer which isolates the B4C from the aluminum matrix. It is also observed that with increasing Ti content, the formation of AI3BC decreases. However, further increase in Ti content causes

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Metal Matrix Composites: Casting Processes

Previtali

2012

Wiley Encyclopedia of Composites

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This article deals with the casting processes of metal matrix composites (MMCs). First, a common definition of MMCs and a classification of main MMC casting routes are given. Then the main casting processes are described, with particular attention to the changes that have to be introduced in order to take into account the peculiar characteristics of MMCs. Finally, the principal and well‐recognized applications in casting MMCs are reported, as well as future developments and challenges.

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The wettability of SiC particles by molten aluminium alloy

Cited by 346 publications

References 28 publications

A Novel Method for Incorporation of Micron-Sized SiC Particles into Molten Pure Aluminum Utilizing a Co Coating

A Novel Method for Incorporation of Micron-Sized SiC Particles into Molten Pure Aluminum Utilizing a Co Coating

Investigation on wetting of B4C by aluminum alloys /

Metal Matrix Composites: Casting Processes

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