Structure and thermal expansion behaviour of Al/C composites reinforced with unidirectionally aligned continuous high modulus C fibres

Beronská, Naďa; Iždinský, Karol; Štefánik, Pavol; Kúdela, S.; Šimančík, František; Vávra, I.; Križanová, Z.

doi:10.4149/km_2011_6_427

Cited by 6 publications

(6 citation statements)

References 26 publications

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“…There is very good wetting in the Cu-W binary system, but very poor wetting in Cu-C system. In order to improve the penetration of copper into the C fibre bundles and to improve the fibre-matrix bonding, copper is alloyed with carbide forming elements [1,6]. Therefore the Cu-0.5Cr alloy was used for infiltration of sample A and B.…”

Section: Discussionmentioning

confidence: 99%

Microstructure and Thermal Expansion of Hybrid - Copper Alloy Composites Reinforced with both Tungsten and Carbon Fibres

Koráb

Kavecký

Štefánik

et al. 2014

MSF

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Tungsten as refractory material and high thermal conductive carbon fibres are promising candidates for production of copper matrix composites for high temperature applications. Three types of rod-like samples were prepared by gas pressure infiltration of different carbon/tungsten fibre preforms with copper and/or copper alloy (Cu-0.5Cr) respectively. The fibres are aligned parallel to rod axis and were combined with the tungsten wire cloth. The microstructure of prepared hybrid composites was examined. The samples were thermally cycled 3 times up to 550 °C at a relatively high heating/cooling rate (10 K/min) to touch real condition in applications where high heat is formed during short time. The thermal expansion behaviour in radial direction was also analysed. Results show that a combination of both types of reinforcements in rod-shapes samples insures good protection against composite disintegration during high temperature thermal loading.

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Section: Discussionmentioning

confidence: 99%

Microstructure and Thermal Expansion of Hybrid - Copper Alloy Composites Reinforced with both Tungsten and Carbon Fibres

Koráb

Kavecký

Štefánik

et al. 2014

MSF

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“…Another carbon-based reinforcement is carbon fiber. Beronska et al [ 135 ] fabricated AMC by reinforcing 57.6 vol% unidirectional carbon fiber in Al-3wt% Mg alloy by the gas pressure infiltration process. Mg was added to suppress the formation of Al 4 C 3 .…”

Section: Metal Matrix Compositesmentioning

confidence: 99%

Metal Matrix Composite in Heat Sink Application: Reinforcement, Processing, and Properties

et al. 2021

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Heat sinks are commonly used for cooling electronic devices and high-power electrical systems. The ever-increasing performance of electronic systems together with miniaturization calls for better heat dissipation. Therefore, the heat sink materials should not only have high thermal conductivities, low densities, and cost, but also have coefficients of thermal expansion matching to those of semiconductor chips and ceramic substrates. As traditional materials fail to meet these requirements, new composite materials have been developed with a major focus on metal matrix composites (MMCs). MMCs can be tailored to obtain the desired combination of properties by selecting proper metallic matrix and optimizing the size and type, volume fraction, and distribution pattern of the reinforcements. Hence, the current review comprehensively summarizes different studies on enhancing the thermal performance of metallic matrices using several types of reinforcements and their combinations to produce composites. Special attention is paid to the types of commonly used metallic matrices and reinforcements, processing techniques adopted, and the effects of each of these reinforcements (and their combinations) on the thermal properties of the developed composite. Focus is also placed on highlighting the significance of interfacial bonding in achieving optimum thermal performance and the techniques to improve interfacial bonding.

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“…Although aluminium has much lower conductivity than pure copper, in aluminium-carbon fibre (Al/C f ) composites, the thermal conductivity values specified for the CMS Outer Tracker application can be obtained. For a 58 vol.% unidirectional C f content in an Al-3 wt.% Mg matrix MMC produced by gas pressure infiltration, the thermal conductivity of 540 W/mK could be achieved [7], while 273 W/mK in the plane were reported that for a unidirectional C f product obtained by a low-pressure infiltration process [8]. Even for a short C f reinforcement, Silvain et al [9] reported for a sintered MMC based on an Al + 5 vol.% AlSi matrix and 40 vol.% carbon fibres, thermal conductivity as high as 240 W/mK in the plane and the order of 120 W/mK in the transverse direction of carbon fibres.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Two Advanced Aluminium-Based Metal Matrix Composites for Application to High Energy Physics Detectors

et al. 2022

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The Outer Tracker of the Compact Muon Solenoid (CMS), one of the large experiments at the CERN Large Hadron Collider, will consist of about 13,200 modules, each built up of two silicon sensors. The modules and support structures include thousands of parts that contribute to positioning and cooling the sensors during operation at −30 °C. These parts should be low mass while featuring high thermal conductivity, stiffness and strength. Their thermal expansion coefficient should match that of silicon to avoid deformations during cooling cycles. Due to their unique thermal and mechanical properties, aluminium-carbon fibre (Al/Cf) Metal Matrix Composites are the material of choice to produce such light and stable thermal management components for High Energy Physics detectors. For the CMS Outer Tracker, about 500,000 cm3 of Al/Cf raw material will be required to be produced through a reliable process to guarantee consistent properties throughout parts manufacturing. Two Al/Cf production routes are currently considered: liquid casting by gas-pressure infiltration and a powder metallurgy process based on continuous semi-liquid phase sintering. The dimensional stability of the resulting material is of paramount importance. Irreversible change of shape may be induced by moisture adsorption and the onset of galvanic corrosion at the discontinuous interfaces between Cf and Al. This paper presents the results of an extensive investigation through Computed Microtomography, direct microscopical investigations, analysis of the interfaces and metrology measurements aimed at comparing and interpreting the response to different environments of the respective products. The results obtained confirm the suitability of the two investigated Al/Cf MMCs for application to components of the CMS Outer Tracker, requiring tight geometrical control and microstructural stability over time. However, for PM parts sintered through the semi-liquid phase process, a multilayered protective noble metal coating is necessary the make them impervious to moisture, allowing dimensional stability to be guaranteed and the onset of corrosion phenomena to be avoided, while the product obtained by gas-pressure infiltration has shown less sensitive even to extreme temperature-humidity cycles and may be used uncoated.

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Structure and thermal expansion behaviour of Al/C composites reinforced with unidirectionally aligned continuous high modulus C fibres

Cited by 6 publications

References 26 publications

Microstructure and Thermal Expansion of Hybrid - Copper Alloy Composites Reinforced with both Tungsten and Carbon Fibres

Microstructure and Thermal Expansion of Hybrid - Copper Alloy Composites Reinforced with both Tungsten and Carbon Fibres

Metal Matrix Composite in Heat Sink Application: Reinforcement, Processing, and Properties

Assessment of Two Advanced Aluminium-Based Metal Matrix Composites for Application to High Energy Physics Detectors

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