The tensile strength of porous copper made by the GASAR process

Simone, Antonia; Gibson, Lorna

doi:10.1016/1359-6454(95)00278-2

Cited by 72 publications

(35 citation statements)

References 11 publications

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“…[1][2][3][4][5][6][7] Hyun et al have shown that lotus-type porous copper has higher specific tensile strength when the tensile direction is parallel to the pore axis, compared with the conventional porous metals produced by, for example, foaming techniques or sintering methods. 1,2) Thus, lotus-type metals are promising both as structural materials and as functional materials.…”

Section: Introductionmentioning

confidence: 99%

“…1,2) Thus, lotus-type metals are promising both as structural materials and as functional materials. This new type of porous metal is fabricated by unidirectional solidification of molten metal dissolving hydrogen [1][2][3][4][5][6][7] or nitrogen. 8,9) During solidification, the gas is rejected at the advancing solidification front due to the solubility gap between the solid and the liquid and forms columnar pores growing in the solidification direction together with the solid phase.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Formation of Pores during Unidirectional Solidification of Water Containing Carbon Dioxide

Murakami

Nakajima

2002

Mater. Trans.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation of Pores during Unidirectional Solidification of Water Containing Carbon Dioxide

Murakami

Nakajima

2002

Mater. Trans.

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“…Various types of scaffolds used for the preparation of porous metals include ligands coordinating metal ions, [10] gels, [11] biopolymers (e.g., dextran [12] ), assemblies of polymeric microspheres (e.g., polystyrene-crosslinked divinylbenzene [13] ), as well as less noble metals (e.g., a Ag-Au [8] or a Cu-Pt alloy [14] ). Although some of these systems achieve high degree of structural control over the material's topology [15] and porosity, [16] the synthesis of the initial metal/scaffold precursors is often problematic, and the particular procedures often lack generality. In this Article, we describe a conceptually different and versatile, bottom-up approach in which metal nanoparticles (NPs) first aggregate into deformable ''supraspheres'' (SS) [17][18][19] which then glue together to form extended structures that upon heating or radiation exposure harden into nanoporous monoliths.…”

Section: Introductionmentioning

confidence: 99%

Bulk Synthesis and Surface Patterning of Nanoporous Metals and Alloys from Supraspherical Nanoparticle Aggregates

Klajn

Gray

Wesson

et al. 2008

Adv Funct Materials

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Supraspheres (SS) composed of hundreds to thousands of metal nanoparticles (NPs) and crosslinked by dithiol linkers are assembled into larger structures, which are subsequently converted into nanoporous metals (NMs). Conversion is achieved by heating which removes organic molecules stabilizing the NPs and allows for NP fusion. Heating of SS solutions leads to NMs of overall macroscopic dimensions; localized radiation using collimated electron beam is used to prepare metallized surface micropatterns. Depending on the composition of supraspherical precursors, nanoporous materials composed of up to three metals can be obtained. Strategies for controlling pore size and nanoscale surface roughness of these materials are discussed.

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“…5 More reactive metals and those with higher melting temperatures require special processing, usually through solid-state techniques. 3,[6][7][8][9][10][11] In the solid-state foaming process, 12,13 metal foams are typically produced using a 2-step process: 1)…”

Section: Introductionmentioning

confidence: 99%

Surpassing the Theoretical Limit of Porosity in Conventional Solid-State Foaming: Microstructure Characterization of Length Scales in a Copper Metal Foam

Tschopp¹,

Darling²,

Atwater³

2014

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)2 5f. WORK UNIT NUMBER Solid-state processes for creating metal foams are often complex and/or time consuming, and in methods such as gas entrapment, there are practical limits to the porosity achievable due to pore coalescence and percolation. A simple process has been developed to create copper-based metal foam with porosity greater than 65%. The process is unique as expansion occurs within particles, not between them. The method is applied to create a bulk part. The microstructure length scales of the foamed particles are examined using 1-and 2-point microstructure statistics. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBER SPONSOR/MONITOR'S ACRONYM(S) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR/MONITOR'S REPORT NUMBER(S)

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The tensile strength of porous copper made by the GASAR process

Cited by 72 publications

References 11 publications

Formation of Pores during Unidirectional Solidification of Water Containing Carbon Dioxide

Formation of Pores during Unidirectional Solidification of Water Containing Carbon Dioxide

Bulk Synthesis and Surface Patterning of Nanoporous Metals and Alloys from Supraspherical Nanoparticle Aggregates

Surpassing the Theoretical Limit of Porosity in Conventional Solid-State Foaming: Microstructure Characterization of Length Scales in a Copper Metal Foam

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