Thermal conductivity and thermal expansion of graphite fiber-reinforced copper matrix composites

Ellis, David L.; Mcdanels, D. L.

doi:10.1007/bf02669601

Cited by 47 publications

(13 citation statements)

References 2 publications

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“…Generally, when the matrix is reinforced with the fibers having a low CTE, the CTE is lower in the direction parallel to the fiber than perpendicular to the fiber. 15) Since the preforms in which the fibers were aligned parallel to the plane were used in the present study, the CTE in the P direction was lower than that in the V direction. However, the difference in the CTE was quite less than that in the thermal conductivity.…”

Section: Thermal Expansion Behavior Of Compositesmentioning

confidence: 90%

Microstructure and Thermal Properties of Squeeze Cast Aluminum Alloy Composite Reinforced with Short Potassium Titanate Fiber

2008

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Aluminum alloy composites reinforced with the short potassium titanate fibers were fabricated to obtain a material having a low thermal expansion rate and good machinability. The composites were fabricated by the squeeze casting. The microstructure, thermal conductivity and thermal expansion behavior of the composites were investigated. Optical microscopy revealed that the fibers were homogeneously distributed in the alloy. However, the fibers were somewhat in a random planar arrangement parallel to the pressed plane when the fiber volume fraction was high. This is due to the forming of the preform by pressing the top and bottom of it. The composites were easily machined using both super alloy and diamond cutting tools. The thermal conductivity of the composite decreased as the fiber volume fraction increased. At the higher volume fraction, the thermal conductivity of the composite in the direction parallel to the pressed plane was higher than that in the transverse direction due to the random planar arrangement of the fibers. The thermal conductivity can be roughly estimated by Landauer's model. The average thermal expansion coefficient of the composite decreased as the fiber volume fraction increased. The difference in the thermal expansion coefficient between the parallel and transverse directions to the pressed plane was slight, and the experimental values were in good agreement with the theoretical values calculated using the rule of mixture.

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Section: Thermal Expansion Behavior Of Compositesmentioning

confidence: 90%

Microstructure and Thermal Properties of Squeeze Cast Aluminum Alloy Composite Reinforced with Short Potassium Titanate Fiber

2008

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“…The longitudinal conductivity for the 40% volume fraction composite is far lower than the rule of mixtures would predict, suggesting that there may be some formation of copper -carbon compounds within the matrix. Photomicrographs of a 50% P100 Gr/Cu composite 33 show some ber -ber contact and a nonuniform ber distribution within the matrix. If appropriate parameters were available, the analysis of Ke-Da et al 7 might be used to modify the models described by Gu, 20 Hasselman et al, 10 -12 and Ellis 31 to account for these irregularities.…”

Section: Experimental Studiesmentioning

confidence: 97%

“…The transverse thermal conductivities were inversely dependent on volume fraction. Ellis 31 and Ellis and McDanels, 32,33 reported that thermal expansion tests showed a considerable mismatch between the bers and the copper matrix. They also reported that the composites showed a coef cient of thermal expansion hysteresis that could be reduced through the use of wetting agents and ber preparation prior to casting the matrix.…”

Section: Experimental Studiesmentioning

confidence: 97%

Review of the Thermal Conductivity of Graphite-Reinforced Metal Matrix Composites

Ayers

Fletcher

1998

Journal of Thermophysics and Heat Transfer

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The characteristics of graphite-reinforced metal matrix composites (MMCs) are increasingly important in a wide range of technologies. While most of the published studies deal with the mechanical properties of these materials, there have been limited studies characterizing the thermal properties of some of these materials. The effective thermal conductivity is of particular importance for design and applications, and experimental data are summarized and compared with accepted models of composite properties. On the basis of this review, it is evident that the thermal properties of graphite ber-reinforced MMCs have not been adequately investigated. Modeling techniques based on limited experimental data have identi ed some of the important parameters, but no single model adequately predicts either the longitudinal or the transverse conductivity of these materials. This study presents a review of the experimental and analytical investigations of the thermal conductivity of these materials and concludes with recommendations for emerging and continuing areas of investigation. Nomenclature a = ber radius d = ber diameter h c = ber -matrix interface contact conductance k = thermal conductivity L = longitudinal s = vertical ber separation T = transverse t = horizontal ber separation V = ber volume fraction v/o = ber volume fraction f = angle of departure from longitudinal direction of the composite Subscripts c = composite e = effective f = ber m = matrix r = radial u = circumferential '= perpendicular to ber direction // = parallel to the ber direction

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“…For the case of multifunctional designs, some microstructured composite materials may be used for other purpose-oriented applications, leading to material phase selections that exhibit a large contrast in thermal properties [31]. The thermomechanical behavior of these materials have to be checked and memory effects have to be taken into account for application with thermal transient loadings.…”

Section: Applicationsmentioning

confidence: 99%

Numerization of a memory effect for an homogenized composite material with a large contrast in the phase thermal conductivities

Dureisseix

Royer

Faverjon

2015

International Journal of Heat and Mass Transfer

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a b s t r a c tIn this article, we propose a systematic numerical solution method for deriving the homogenized material parameters in the case where a large contrast in the phase thermal properties leads to a macroscopic memory effect. Focus is therefore set on the determination of this memory effect for a periodic microstructure. As for other and more classical homogenized parameters, the possibility of analyzing with the finite element method a single periodic cell is used, and a transient simulation allows to provide the incremental evolution of the memory effect function. Additionally, some approximations are proposed for a low cost estimate of this function, and validated on two examples.

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Thermal conductivity and thermal expansion of graphite fiber-reinforced copper matrix composites

Cited by 47 publications

References 2 publications

Microstructure and Thermal Properties of Squeeze Cast Aluminum Alloy Composite Reinforced with Short Potassium Titanate Fiber

Microstructure and Thermal Properties of Squeeze Cast Aluminum Alloy Composite Reinforced with Short Potassium Titanate Fiber

Review of the Thermal Conductivity of Graphite-Reinforced Metal Matrix Composites

Numerization of a memory effect for an homogenized composite material with a large contrast in the phase thermal conductivities

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