Elastic properties of ceramic–metal particulate composites

The nanoscopic morphologies, thermo-mechanical, mechanical and electrical properties of graphite nanoplatelet (GNP)/epoxy nanocomposites were evaluated after UV/O 3 treatment of graphite. Composites containing uniformly distributed GNP reinforcements of well controlled exfoliation were prepared through the graphite intercalation compound (GIC) technique, graphite surface treatment and optimized ultrasonication process with the aid of solvent. The UV/O 3 treatment showed ameliorating effects on various properties of nanocomposites arising from the enhanced graphite-epoxy interfacial adhesion. The flexural moduli and strengths were higher after treatment for a given GNP content. The themo-mechanical properties, such as glass transition temperature and storage modulus, increased with increasing exposure duration before saturation after about 30 min of exposure. The electrical resistivity of treated nanocomposites decreased with increasing GNP content much faster than those containing untreated GNPs. The percolation thresholds of both nanocomposites with and without UV/O 3 treatment were similarly about 1 wt%, which is much lower than the values reported in the literature. The interparticle distances were predicted for different particle aspect ratios and volume fractions, and the comparison between the prediction and the experimental aspect ratio for a given percolation threshold indicates reasonable agreement.

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“…The experimental results are compared with two typical theoretical models [16,17]. The Tandon-Weng equation…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…The Reuss model [17] is equivalent to the so-called 'rule-of-mixtures' equation under the iso-stress state:…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Morphology and properties of UV/ozone treated graphite nanoplatelet/epoxy nanocomposites

Sham

Kim

et al. 2007

Composites Science and Technology

199

110

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“…the Young's modulus can be determined for this type of composites using the Voigt and Ruess models [8] and is close to the arithmetic average of the values calculated from these two models. Limitations of the Voigt and Ruess models and examples of its application to the composite with the particle reinforcement like other analytical formulas can be found in [9]. The difference between the two results from the different assumptions in the two methods.…”

Section: Resultsmentioning

confidence: 99%

Effect of Metallic Additives to Polymer Matrix on Properties of Composite Adhesives Dedicated for Light Metal Joining

Mamala

Kwaśniewski

Nowak

et al. 2017

Archives of Metallurgy and Materials

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The most recent and promising trends in development of renewable sources of energy are Combined Heat and Power (CHP) systems. The newest solutions from this field are hybrid compact solar panels. The correct operation of both systems, i.e. the photovoltaic panel and the heat exchanger requires an effective connection between the two. The adhesives utilized to interconnect above elements should provide a stable and hermetic joint able to withstand mechanical and thermal impacts of the surrounding environment factors. The paper presents the research results over the impact of the type and the amount of reinforcing phase on the physical and mechanical properties of epoxy resin matrix composites reinforced with particles of non-ferrous metals (Ag, Cu, W, Al), dedicated as adhesives for connections between photovoltaic panels and heat exchangers. Based on the experimental findings the usefulness of classical analytic models for valuation of polymer-metal composites properties was validated.

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“…Ultrasonic measurements are a common tool used to determine the elastic properties of particulate materials (Ref [21][22][23]. In the present studies, the obtained sintered samples were assumed to be isotropic materials due to random orientation of the grains and distributed in the materialÕs volume.…”

Section: Methodsmentioning

confidence: 99%

Sintering Behavior and Mechanical Properties of NiAl, Al2O3, and NiAl-Al2O3 Composites

Chmielewski

Nosewicz

Pietrzak

et al. 2014

J. of Materi Eng and Perform

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It is commonly known that the properties of sintered materials are strongly related to technological conditions of the densification process. This paper shows the sintering behavior of a NiAl-Al 2 O 3 composite, and its individual components sintered separately. Each kind of material was processed via the powder metallurgy route (hot pressing). The progress of sintering at different stages of the process was tested. Changes in the microstructure were examined using scanning and transmission electron microscopy. Metal-ceramics interface was clean and no additional phases were detected. Correlation between the microstructure, density, and mechanical properties of the sintered materials was analyzed. The values of elastic constants of NiAl/Al 2 O 3 were close to intermetallic ones due to the volume content of the NiAl phase particularly at low densities, where small alumina particles had no impact on the compositeÕs stiffness. The influence of the external pressure of 30 MPa seemed crucial for obtaining satisfactory stiffness for three kinds of the studied materials which were characterized by a high dense microstructure with a low number of isolated spherical pores.

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Elastic properties of ceramic–metal particulate composites

Cited by 56 publications

References 63 publications

Morphology and properties of UV/ozone treated graphite nanoplatelet/epoxy nanocomposites

Morphology and properties of UV/ozone treated graphite nanoplatelet/epoxy nanocomposites

Effect of Metallic Additives to Polymer Matrix on Properties of Composite Adhesives Dedicated for Light Metal Joining

Sintering Behavior and Mechanical Properties of NiAl, Al2O3, and NiAl-Al2O3 Composites

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