Selective interfacial bonding in Al(Si)–diamond composites and its effect on thermal conductivity

Ruch, Patrick; Beffort, O.; Kleiner, S.; Weber, Ludger; Uggowitzer, Peter J.

doi:10.1016/j.compscitech.2006.03.016

Cited by 236 publications

(130 citation statements)

References 17 publications

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“…By redoing the calculation with the DEM model and the experimental results in [13] a value of 83 W/m 2 K can be found, which is still above any other value published up to now. Chu et al [41], who provided a theoretical value of 21×10 6 W/m 2 K calculated with the acoustic mismatch model, estimated with a double effective-medium approach scheme the thermal conductances for (111) and (100) diamond orientations based on the experiments of [13].…”

Section: Figurementioning

confidence: 54%

“…Beffort et al [14] reported exactly the same value of 1,6×10 6 W/m 2 K for Al/diamond squeeze cast composites. The value of 184×10 6 W/m 2 K found in [13] with a back-calculation with the Hasselman-Johnson model for composites obtained by gas pressure infiltration is an outstanding value which finds no comparison in the literature. However, we shall here take into account that the Hasselman-Johnson model may introduce artefacts in the predictions of thermal conductivity when the effective phase contrast between the matrix and inclusion is above four (which is the case for Al/diamond composites) [40].…”

Section: Figurementioning

confidence: 99%

“…The high value reported in [38], obtained for an ideal aluminum-diamond interface free of reaction products, coincides (within error) with the maximum value found in the present work, obtained for processing conditions of gas pressure infiltration at 850ºC and 0.75 min of contact time. The values published in [13] were obtained from a back-calculation with the Hasselman-Johnson model for Al/diamond composites fabricated by either squeeze casting or gas pressure infiltration (diamond quality was of MBD4 grade, purchased from Henan Famous Industrial Diamond Co., Ltd.). Their results -1,6×10 6 W/m 2 K for squeeze cast composites and 184×10 6 W/m 2 K for composites processed by gas pressure infiltration -already pointed out that the formation of Al 4 C 3 might in fact be desirable in order to obtain interfacial bonding between aluminum and diamond.…”

Section: Figurementioning

confidence: 99%

“…Silicon, which mainly remains in metallic solution, has a detrimental effect on the thermal conductivity of the composites. As a prove, Ruch et al [13] measured 670 W/mK for diamond-based composites with Al 99,99% matrix and, instead, 375 W/mK when matrix was replaced by Al-7wt%Si.…”

Section: Introductionmentioning

confidence: 99%

“…An interesting body of research has been devoted to compare composites fabricated by pressure-assisted methods such as squeeze casting and gas-pressure infiltration [13][14][15]. Squeeze cast Al-7wt%Si/diamond composites, for which metal was rapidly solidified, exhibited lower thermal conductivities than those obtained with gas pressure-assisted infiltration [13].…”

Section: Introductionmentioning

confidence: 99%

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On critical aspects of infiltrated Al/diamond composites for thermal management: Diamond quality versus processing conditions

Monje

Louis

Molina

2014

Composites Part A: Applied Science and Manufacturing

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Please cite this article as: Monje, I.E., Louis, E., Molina, J.M., On critical aspects of infiltrated Al/diamond composites for thermal management: Diamond quality vs processing conditions, Composites: Part A (2014), doi: http://dx.doi.org/10. 1016/j.compositesa.2014.08.015 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. TC is mainly governed by the Al-diamond interface characteristics, which are determined by a proper control exerted through processing conditions. Albeit a very low cost and low quality diamond is used, a high value of 667 W/mK has been measured for Al/diamond composites produced under optimized processing conditions. Values above 740 W/mK are reported for the best diamond quality explored in this work. These experimental results, which assign the control over TC mainly to the interface conductance, suggest that many of the limiting values of TC reported in literature for the different explored metal-diamond systems, need to be reconsidered by proper precise control of interface evolution. ON CRITICAL ASPECTS OF INFILTRATED

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Section: Figurementioning

confidence: 54%

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On critical aspects of infiltrated Al/diamond composites for thermal management: Diamond quality versus processing conditions

Monje

Louis

Molina

2014

Composites Part A: Applied Science and Manufacturing

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Microwave Sintering Explored by X‐Ray Microtomography

Ishizaki

Battabyal

Pittini

et al. 2009

Ceramic Transactions Series

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Fabrication of Functionally Graded Carbon Nanotube‐Reinforced Aluminum Matrix Composite

2010

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Functionally graded materials (FGMs) are compositionally gradient materials which were first proposed in Japan in 1984. [1] They have been suggested as a way of fabricating bulk materials with tailored properties because they can achieve the controlled distribution of the desired characteristics within the same bulk material. This FGM can be applied for engineering parts instead of coated materials. However, careful selection of the component materials, particularly the reinforcement, is required to reliably achieve a high performance from the FGM. Carbon nanotubes (CNTs), which have a unique combination of excellent mechanical, electrical, and thermal properties, have become a hot property in the engineering materials field, since their discovery in Japan in 1991. [2,3] For this reason, CNT is a satisfactory candidate to be a reinforcement material for fabricating high quality FGMs.Extensive research on the fabrication and characterization of CNT-reinforced polymer, [4,5] ceramic, [6,7] and metal matrix [8,9] composites has been carried out but CNT gradient layer-reinforced FGMs have rarely been investigated. Recently, Estili et al. have reported that the CNT gradient layer in ceramic matrix composite materials fabricated by the spark plasma sintering process shows similar hardness results to the ceramic matrix. [10] Ke et al. studied the nonlinear free vibration of functionally graded CNT nanocomposite based on numerical results. [11] Shen and Zhang have reported the mechanical behavior of functionally graded CNT-reinforced composites in thermal environments by a micromechanical model. [12,13] Indeed, most investigations regarding functionally graded CNT-reinforced composite materials were based on numerical calculations or models.In the present study, we attempted to fabricate functionally graded CNT-reinforced metal matrix composite bulk materials by a powder metallurgy route and to then characterize these composites. Aluminum (Al) was utilized for the matrix material because its high specific strength and high ductility [14] combined with the CNT offers high performance of structural materials. In particular, extremely different characteristics in the same Al-CNT bulk materials (e.g., highly strengthened surfaces and highly enhanced ductility inside) can be achieved by the FGM concept. The various Al-CNT composite powders were prepared by a planetary ball milling process and then hot pressed in a layered structure. The FGM bulk obtained was analyzed, with a focus on the hardness of each CNT gradient layer. Moreover, microstructural observations, phase analyses, and density measurements were carried out, to develop a better understanding of the hardness behavior in the FGM bulk. ExperimentalMultiwalled CNTs (Baytubes C150P, Bayer material science, purity 99.5%, diameter: 20 nm, length: 30 mm) and gas-atomized pure Al powder (ECKA Granules, purity 99.5%, mean particle size: 63 mm) were used as the starting materials. Homogeneously well dispersed CNT-Al composite powders containing 5, 10, and 15 vol% CNT were p...

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Selective interfacial bonding in Al(Si)–diamond composites and its effect on thermal conductivity

Cited by 236 publications

References 17 publications

On critical aspects of infiltrated Al/diamond composites for thermal management: Diamond quality versus processing conditions

On critical aspects of infiltrated Al/diamond composites for thermal management: Diamond quality versus processing conditions

Microwave Sintering Explored by X‐Ray Microtomography

Fabrication of Functionally Graded Carbon Nanotube‐Reinforced Aluminum Matrix Composite

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