Development of graphite/copper composites utilizing engineered interfaces



Publisher: National Aeronautics and Space Administration, Lewis Research Center, Publisher: For sale by National Technical Information Service in [Cleveland, Ohio], [Springfield, Va

Written in English
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  • Composite materials.

Edition Notes

StatementSandra Marie DeVincent.
SeriesNASA contractor report -- 187143., NASA contractor report -- NASA CR-187143.
ContributionsLewis Research Center.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL15392956M

This article reviews recent advances in conductive polymer composites from renewable resources, and introduces a number of potential applications for this material class. In order to overcome disadvantages such as poor mechanical properties of polymers from renewable resources, and give renewable polymer composites better electrical and thermal conductive properties, various filling contents. In particular, the self-sensing using embedded nanoparticles has gained prominence in recent development of composites, to accommodate the increased desire from industry to acquire structural parameters and ambient information, not at the cost of introducing excessive weight and volume penalty to original composites due to the use of additional. Copper-graphite particulate composites retain combined properties of copper, i.e., excellent thermal and electrical conductivities, and properties of graphite, i.e., solid lubricating and low.   1 Introduction. Graphene, the poster child of 2D materials, is a nanomaterial consisting of atom‐thick planar sheets of sp 2 bonded carbon atoms arranged in a honeycomb shape. It was first isolated from graphite by Novoselov and Geim in at the University of Manchester, 1 work that was later recognized with the Nobel Prize in physics in As a material, it combines many unique and.

Seunggun Yu, Jang-Woo Lee, Tae Hee Han, Cheolmin Park, Youngdon Kwon, Soon Man Hong, Chong Min Koo, Copper Shell Networks in Polymer Composites for Efficient Thermal Conduction, ACS Applied Materials & Interfaces, /am, 5, 22, (), ().   For aluminum-graphene composites, the prepared billets are heated to >°C which may lead to carbide formation at the metal graphene interfaces which reduces the strength of the composite. Most of the research has been carried out using spherical shaped aluminum powder (1–22 μm). Improvement of copper to graphite adhesion by thin interfacial films of titanium and chromium was investigated. Graphite fibers and highly oriented pyrolytic graphite flats were sputter-coated first with 10 nm of titanium or chromium and then with 50 nm of copper.   A low-cost nanocomposite catalyst containing copper oxide (CuO) nanoparticles (NPs) on graphene oxide (GO) was fabricated by a facile hydrothermal self-assembly process. The segregated CuO NPs and GO exhibited negligible catalytic activities for the reduction of nitroaromatics. However, their hybrid composite accomplished facile reduction with high conversions for several substituted.

The thermal management of smart and wearable electronics has become a serious issue, due to their reducing size and increasing power density, which has high requirement on weight, size and thermal conductance. In this paper, we propose an effective approach to fabricate Cu–graphite–Cu (Cu–G–Cu) sandwich heat spread. Discontinuous pitch-based graphite fiber reinforced copper (Cu/Gr) composites have been under development for semiconductor thermal management. The composites consist of a high thermal conductivity copper-chromium alloy matrix and short pitch-based graphite fibers randomly oriented in planar directions. Pradeep K. Rohatgi (born 14 August ) is a professor of materials engineering, and director of the Center for Composites at the University of Wisconsin– is a world leader in the field of composite materials, particularly metal matrix composites.. He currently serves as a Wisconsin and University of Wisconsin-Milwaukee's Distinguished Professor and the director of the College.   Free Online Library: Effect of liquid phase additions on microstructure and thermal properties in copper and copper-diamond composites.(Research Article, Report) by "Advances in Materials Science and Engineering"; Engineering and manufacturing Composite materials Structure Thermal properties Powder metallurgy Analysis Thermal conductivity.

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Development of graphite/copper composites utilizing engineered interfaces Item Preview from these measurements were then applied to a model for the fiber matrix interfacial debonding phenomenon found in graphite/copper composites. The formation obtained from the sessile drop tests led to the development of a copper alloy that suitably wets.

Liquid copper does not wet graphite as the contact angle of liquid copper on graphite is ° at °C. So, it is impossible to infiltrate porous graphite preform with pure copper spontaneously.

In recent years, researchers prepared SiC/Al, graphite/ NiSi composites through a special pressure-less infiltration technique [14], [15], [16 Cited by: composites show, by using graphene as the filler one can improve the mechanical properties of Cu, while maintaining good thermal and electrical properties [12, 19–74], thereby obtaining CMCs with good structural–functional integration.

Speciality Cu alloys that could benefit from graphene additions are the copper-tungsten (CuW) or tungsten-Cited by: Copper–graphite metal matrix composites possess the properties of copper, i.e.

excellent thermal and electrical conductivities, and properties of graphite, i.e. solid lubricating and small thermal expansion coefficient. They arewidely used as brushes, and bearing materials because of the above properties.

An extensive account is given of the large number of processing methods that can be employed to prepare copper/graphene composites along with a description of the. Mesophase pitch-based graphite fibers (MPGF) were coated with copper by electrodeposition. Subsequently, unidirectional MPGF/Cu composites with near-zero thermal expansion were fabricated by hot-pressing using copper-coated fibers as raw materials.

Cu/graphite composites with 30 and 50 vol.% of graphite were prepared. Copper coated graphite particles enabled to prepare more homogeneous structure at 50 vol.% of graphite.

The damping property of the composite increased as the content of the graphite particles increased, and the damping property of the composites was several times higher than that of graphite and pure aluminum.

Liu et al. prepared n-Gr-Al-Mg-Si composites by using the hot pressing method and observed that the addition of nanographite could. To introduce multifunctionalities to concrete using graphene, we first prepared suspensions of graphene in water by high‐shear liquid phase exfoliation of graphite powder using the surfactant sodium cholate (see Figure 1A), resulting in surfactant FG.

Figure 1B shows the high‐shear mixer used in this work. The composite having similar composition does consist of a lean aluminum–copper alloy matrix and the copper particulates as reinforcements with an interface, comprising a series of alloys from the matrix to the reinforcement, aluminum rich alloys to copper rich alloys, respectively.

Composites with higher concentrations (10% and 15%) of. Abstract. Unidirectionally reinforced graphite/copper composites have been fabricated using a pressure infiltration casting procedure. T and T graphite fibers have been used to reinforce copper and copperchromium alloys.

The effects of the chromium level in the copper matrix on the tensile strength, stiffness, and thermal expansion behavior of the composites have been evaluated through tensile and. Recent research upon the incorporation of graphene into copper matrix composites is reviewed in detail.

An extensive account is given of the large number of processing methods that can be employed to prepare copper/graphene composites along with a description of the microstructures that may be produced. Processing routes that have been employed are described including powder.

1. Introduction. Extensive studies have been conducted to achieve excellent mechanical and thermal properties from carbon-nanotube (CNT)-reinforced metal matrix composites,.Graphene, which is a two-dimensional carbon material, has recently attracted attention as a reinforcing agent because it is much more cost-effective and has higher thermal and electrical conductivities and.

USA US07/, USA USA US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords graphite copper copper alloy graphite particles alloy Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Copper-graphite nanocomposites containing 5 vol.% graphite were prepared by a powder metallurgy route using an electrical wire explosion (EEW) in liquid method and spark plasma sintering (SPS) process.

Graphite rods with a mm diameter and copper wire with a mm diameter were used as raw materials for EEWin. Retaining the inherent hydrophilic character of GO (graphite-oxide) nanosheets, sp2 domains on GO are covalently modified with thiol groups by diazonium chemistry.

The surface modified GO adsorbs 6-fold higher concentration of aqueous mercuric ions than the unmodified GO.

“Core–shell” adsorbent granules, readily useable in filtration columns, are synthesized by assembling aqueous GO over.

of matrix material, reinforcements, and the matrix reinforcement interface [4]. 3-COPPER-GRAPHITE COMPOSITE Copper-Graphite composites are an example of metal matrix composites.

Basically they are a dispersion of graphite in pure copper matrix. The composite that we will be studying about has been fabricated by Casting. Copper-graphite composite has been successfully fabricated by powder metallurgy process using conventional and spark plasma sintering techniques, XRD study shows the existence of both copper and graphite (carbon) phases along some copper oxide in conventionally sintered samples.

Abstract. Copper–carbon composites were prepared following various different synthetic routes and using various carbon precursors (i.e., lignocellulose and graphite oxide), and were used as electrocatalysts for the oxidation of propargyl alcohol (PGA) in an alkaline medium. The electrochemical response of the copper-based catalysts was analyzed in terms of the influence of the metallic species, the carbon matrix incorporated in the composites.

Silicon–graphite composites are under development for the next generation of high-capacity lithium-ion anodes, and vibrational spectroscopy is a powerful tool to identify the different mechanisms that contribute to performance loss.

With alloy anodes, the underlying causes of cell failure are significantly different in half-cells with lithium metal counter electrodes compared to full cells. The aim of this work is to determine the threshold value of the volume fraction of copper for Cu/graphite composites prepared by the powder metallurgical method and to show that the existence of this threshold depends on the structure of Cu/graphite composite, especially on the geometry of copper particles, on their size, shape and orientation.

copper- graphite composites was discussed by Moustafa et al. [7]. Schubert et al. [8] manipulate the interface between copper and graphite flakes to decrease the interface thermal barrier.

In contrast to diamond- copper interfaces, there the carbide formation support the heat transfer across the surface, the most promising copper- graphite. Aluminium-based composite liners can be cast in situ using conventional methods, including sand, permanent mould, die casting and centrifugal casting.

Main bearings. Lead-free aluminium or copper matrix composites containing graphite particles, as developed at UWM, can replace the copper-lead bearings used in crankshaft main-bearing caps.

The. We investigated thermal properties of the epoxy-based composites with the high loading fraction—up to f ≈ 45 vol %—of the randomly oriented electrically conductive graphene fillers and electrically insulating boron nitride fillers.

It was found that both types of the composites revealed a distinctive thermal percolation threshold at the loading fraction fT > 20 vol %. The graphene. Thermal management of polymeric composites is a crucial issue to determine the performance and reliability of the devices.

Here, we report a straightforward route to prepare polymeric composites with Cu thin film networks. Taking advantage of the fluidity of polymer melt and the ductile properties of Cu films, the polymeric composites were created by the Cu metallization of PS bead and the hot.

tribological behaviour of copper–graphite composite is discussed by W. Maa et al. [8]. Zhao et al. [9] examined the wear and corrosion behaviour of Cu–graphite composites organised by electroforming. The constancy of copper segregations on Copper/Carbon Metal-matrix Composite interfaces.

Thermal Conductivity of Graphite/Aluminum and Graphite/Copper Composites M. Lambert, M. Lambert Department of Mechanical Engineering, San Jose State University, San Jose, CA ASM Metals Reference Book,American Society for Metals, Metals Park, Development of a Closed-Loop Heat-Pipe for Heat Recovery With Mini.

A key objective in the development of vanadium redox flow batteries (VRFBs) is the improvement of cell power density. At present, most commercially available VRFBs use graphite felt electrodes under relatively low compression. This results in a large cell ohmic resistance and limits the maximum power density.

To date, the best performing VRFBs have used carbon paper electrodes, with high. Graphene oxide, a single layer of graphite oxide (GO), has been used to prepare graphene oxide/polyaniline (PANI) composite with improved electrochemical performance as supercapacitor electrode by in situ polymerization using a mild oxidant.

The composites are synthesized under different mass ratios, using graphite as start material with two sizes: 12 and mesh. The result shows. Copper matrix composites reinforced with three types of graphene materials, namely graphene nanoplatelets, nickel-plated GNPs and reduced graphene oxide, were separately fabricated using a molecular-level mixing process.

Different from nanoparticles and nanofibers, graphene materials exhibit a unique two-dimension. Graphite fiber-reinforced composite materials have been evaluated for use in aircraft structural components, primarily as a means of reducing the weight of selected metal parts.

Control surfaces, fairings, internal structures, and landing gear have been manufactured, laboratory tested, and, in many.rather than the interface between graphite particles and Copper matrix.

Wear resistance is improved after the incorporation of graphite particles into copper matrix. Simon Dorfman & David Fuksb () [12] studied the stability of copper segregations on Copper/Carbon Metal-matrix Composite interfaces. Composites Overview Origins of Composites. The rapid development and use of composite materials beginning in the s had three main driving forces.

Military vehicles, such as airplanes, helicopters, and rockets, placed a premium on high-strength, light-weight materials.