Compressive Behavior of Conductive Graphite Foams

Smith, Craig; Gyekenyesi, Andrew L.; Singh, Mrityunjay; Bail, Justin L.

doi:10.1007/s11665-011-0096-9

Cited by 6 publications

(6 citation statements)

References 6 publications

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“…The absolute values of the preliminary tensile strengths were similar to the compressive values as documented in Ref. , but the standard deviations associated with the tensile strengths were two‐to‐three times greater than the compressive results at similar densities.…”

Section: Resultssupporting

confidence: 80%

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Integration of High‐Conductivity Graphite Foam to Metallic Systems Using Ag‐Cu‐Ti and Ag‐Cu‐Pd Braze Alloys

Singh

Smith

Asthana

et al. 2013

Int J Applied Ceramic Tech

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Graphite foams with low, medium, and high densities were joined to Cu‐clad‐Mo, 430 stainless steel, titanium, and Inconel 625 using Cusil‐ABA® and Palcusil‐5®. Copper‐clad‐molybdenum and steel were also joined to SiC‐coated foam. Well‐bonded joints with partially infiltrated foam and with carbon ligaments enriched with Ti formed in Cusil‐ABA joints of coated and uncoated foam. Low‐density foams showed greatest braze penetration and penetration distance decreased with increasing foam density. Foam/metal joints with Palcusil‐5 showed less penetration than Cusil‐ABA. The tension test on foam/Cu‐clad‐Mo and foam/430 stainless steel joints made using Cusil‐ABA revealed that the joints were always stronger than the foam.

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Section: Resultssupporting

confidence: 80%

“…for the three foam/substrate combinations examined. The strain is obtained via cross‐head displacement as previous data has indicated that the cross‐head displacement provides comparable results with an advanced full‐field, optical strain measurement technique. Table lists the average strengths of the sandwich specimens.…”

Section: Resultsmentioning

confidence: 81%

Integration of High‐Conductivity Graphite Foam to Metallic Systems Using Ag‐Cu‐Ti and Ag‐Cu‐Pd Braze Alloys

Singh

Smith

Asthana

et al. 2013

Int J Applied Ceramic Tech

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“…The overall shapes of the stress strain curves were consistent with those found for other porous carbon foams, i.e. the stress increased rapidly to a crush initiation value after which it flat-lined [22]. The crush point was reached at a stroke distance of about 1 mm (2% strain).…”

Section: Mechanical Compression Testssupporting

confidence: 83%

Graphite foam from pitch and expandable graphite

Focke

Badenhorst

Ramjee

et al. 2014

Carbon

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“…Foaming affected the electrical conductivity of the nanocomposites, which is attributed to the cell growth effect the alignment and interconnection of the surrounding GNPs and CB conductive fillers. 39,40 Figure 3 illustrates the relative resistance (R/R 0 ) change of foamed samples (GNPs:CB 5 2:1, 6 wt %) with different AC agent content (12,15, and 18 wt %) during the physical foaming process. Obviously, under the AC agent optimum active temperature (140-150 8C), with the foaming time increase, the relative resistance of the three foamed sample decreases at first and then increases.…”

Section: Electrical Conductivity Transformation Characteristicsmentioning

confidence: 99%

“…[4][5][6][7][8] Physical foaming process such as supercritical carbon dioxide (scCO 2 ) technology 9 provides a feasible method to establish the porous nanocomposites with higher electrical conductivity, lower electrical percolation, higher dielectric permittivity, and lower dielectric loss. [10][11][12][13] Foamed nanocomposites filled with conductive particles [14][15][16] have been researched to enhance the electrical conductivity and electromagnetic interference (EMI) shielding effectiveness [17][18][19] owing to their unique combination of electrical conductivity and mechanical flexibility. Yang et al 20 reported a novel foam structure by using the simple preparation process, and investigated the electrical conductivity, complex permittivity, and EMI shielding properties.…”

Section: Introductionmentioning

confidence: 99%

Electrical conductivity transformation mechanism of GNPs/CB/SR nanocomposite foams

Liu

Hao

et al. 2017

J of Applied Polymer Sci

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Highly flexible and electrically conductive graphene nanoparticles/carbon black/silicon rubber (GNPs/CB/SR) based nanocomposite foams were formed by using azodicarbonamide (AC) physical foaming technology. The foaming parameters (foaming agent and foaming time) were analyzed to investigate the influence on the electrical properties and microcellular structure. The electrical percolation threshold of GNPs/CB/SR nanocomposite foams approximately decreases from 25% to 30%, as the volume expansion increases through foaming. Nanocomposite foams with conductive fillers of 3–12 wt %, foaming agent of 12–18 wt %, foaming time of about 150–500 s, relative densities of 1.0–0.4 g/cm3 were achieved, providing a scheme to evaluate the transformation of electrical properties with different foaming degree. It is worth noting that the product of AC agent concentration and foaming time reaches a certain value, and the highest electrical conductivity of foamed nanocomposites could be achieved. The nonmonotonicity changing of the electrical conductivity was demonstrated. Combined with the microtopography characterization, the cell growth effect was introduced to illustrate the transformation mechanism of the electrical conductivity. The relationship between the microcellular structure and the electrical conductivity of the foamed nanocomposites was established, which is essential for further optimizations of the foaming materials for the targeted application. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45996.

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Compressive Behavior of Conductive Graphite Foams

Cited by 6 publications

References 6 publications

Integration of High‐Conductivity Graphite Foam to Metallic Systems Using Ag‐Cu‐Ti and Ag‐Cu‐Pd Braze Alloys

Integration of High‐Conductivity Graphite Foam to Metallic Systems Using Ag‐Cu‐Ti and Ag‐Cu‐Pd Braze Alloys

Graphite foam from pitch and expandable graphite

Electrical conductivity transformation mechanism of GNPs/CB/SR nanocomposite foams

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