Survey on wetting of SiC by molten metals

Fabrication and properties of graphite flakes/metal composites for thermal management applications

The article gives an review of the state-of-the-art for the Replication process as it is practiced for the production of microcellular metals or ceramics It includes a general description of the process and its variants and gives a brief overview of fundamentals, placing particular focus on pathways it offers for microstructural tailoring and control

Replication Processing of Highly Porous Materials

The effect of porosity on the thermal conductivity of Al–12 wt.% Si/SiC composites

Carbon materials, including carbon fibers, graphite, diamond, carbon foams, carbon nanotubes, and graphene, are attractive reinforcements for aluminum matrix composites due to their excellent mechanical and/or physical properties as well as light weight. Carbon materials reinforced aluminum (C/Al) composites are promising materials in many areas such as aerospace, thermal management, and automobile. However, there are still some challenging problems that need to be resolved, such as interfacial reactions, low wettability, and anisotropic properties. These problems have limited the use of these composites. This review mainly focuses on the categories, fabrication processes, existing problems and solutions, coatings and interfaces, challenges and opportunities of C/Al composites so as to provide a useful reference for future research.

Carbon Materials Reinforced Aluminum Composites: A Review

A new technique is proposed for the direct measurement of capillary forces in systems of relevance to the infiltration processing of metal matrix composites Capable of handling melt temperatures up to 1500 K and infiltration pressures up to 20 MPa, the technique is essentially a high-temperature analogue of mercury porosimetry Its accuracy is demonstrated by comparison with other techniques and its use is illustrated with the infiltration of diamond particle preforms by Al and Al-Si alloys at 973 K (c) 2006 Elsevier Ltd All rights reserved

Measuring and tailoring capillary forces during liquid metal infiltration

The high-temperature wettability of alumina particulate preforms by copper is investigated by means of infiltration experiments conducted at 1473 K under low oxygen partial pressure. Wetting is quantified in terms of drainage curves, which plot the volume fraction of metal in the porous medium vs. the applied pressure. Mercury porosimetry is also used on similar preforms for comparison. The effect of volume fraction, particle geometry and capillary parameters on the drainage curve are studied and compared with the expression proposed by Brooks and Corey. The influence of the particle volume fraction and capillary parameters characterizing wetting in the two systems is discussed to derive an effective contact angle for wetting of alumina particles by molten copper.

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Wetting in infiltration of alumina particle preforms with molten copper

Infiltration of graphite preforms with Al-Si eutectic alloy and mercury

The high-temperature wettability of AlN particle preforms with pure molten Cu, Al and Ph is quantified by means of drainage curves measured during pressure infiltration. By integrating the drainage curves obtained in this study, the work of immersion for each system can be estimated, allowing in turn to deduce an apparent contact angle for wetting of AlN by these metals. The influence of system nature and temperature on the apparent contact angle are studied and discussed by comparison with literature values measured using the sessile drop method. (C) 2008 Elsevier B.V. All rights reserved.

High-temperature wettability of aluminum nitride during liquid metal infiltration

Drainage curves (plots of the non-wetting fluid saturation versus applied pressure) for infiltration of SiC particle preforms with Al and Al-12.2 at.% Si are measured at 1023 K (750 degrees C) with a pressure infiltration apparatus adapted for direct tracking of the metal ingress into the porous preform. From these curves the work of immersion is estimated by integration over the whole range of saturation and pressures from 0.1 MPa to 10MPa, which in turn is used to deduce the metal contact angle on the ceramic. Drainage curves obtained for powder beds based on monomodal SiC particles of mean diameter from 6.5 mu m to 40 mu m yield values for the work of immersion and contact angles that are consistent among themselves and are in good agreement with data in the literature determined by the sessile drop method. (C) 2008 Elsevier B.V. All rights reserved.

M. Bahraini

Papers

Measuring and tailoring capillary forces during liquid metal infiltration

Wetting in infiltration of alumina particle preforms with molten copper

Infiltration of graphite preforms with Al-Si eutectic alloy and mercury

High-temperature wettability of aluminum nitride during liquid metal infiltration

Direct measurement of drainage curves in infiltration of SiC particle preforms