Graphene NanoPlatelets reinforced tantalum carbide consolidated by spark plasma sintering

Nieto, Andy; Lahiri, Debrupa; Agarwal, Arvind

doi:10.1016/j.msea.2013.06.006

Cited by 152 publications

(66 citation statements)

References 89 publications

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“…The new toughening micromechanisms and specific deformation modes operating in nanocrystalline ceramics are discussed in detail in §4. In order to enhance mechanical properties of ceramic materials, it is very effective to exploit graphene platelets/sheets as reinforcing structural elements in ceramic-matrix nanocomposites [24,25,[46][47][48][49][50][51][52]. This new approach is based on the unique mechanical characteristics (e.g.…”

Section: Fracture Processes In Nanoceramics: General Aspects and Key mentioning

confidence: 99%

“…More than that, in the first decade of the twenty-first century, ceramic-CNTs nanocomposites were viewed as the most promising ceramic materials for structural applications [21][22][23]. In recent years, however, graphene inclusions in the forms of multilayer graphene and GO platelets/sheets have been recognized as the most effective reinforcing fillers that dramatically enhance fracture toughness (and moderately improve strength) of ceramic-matrix composites [2,25,[46][47][48][49][50][51][52]. For instance, in one experiment [46], the mechanical characteristics (Young modulus, bending strength, hardness, fracture toughness) of silicon nitride reinforced by few-layer graphene sheets showed 10-50% enhancement when compared with those of silicon nitride reinforced by CNTs.…”

Section: Fracture Behaviour Of Ceramic-graphene Nanocompositesmentioning

confidence: 99%

“…Tantalum carbide-graphene nanocomposites were produced by spark plasma sintering and showed high mechanical characteristics [51]. In particular, these nanocomposites exhibited 99% increase in the fracture toughness, when compared with their TaC counterparts free from graphene.…”

Section: Fracture Behaviour Of Ceramic-graphene Nanocompositesmentioning

confidence: 99%

“…In particular, these nanocomposites exhibited 99% increase in the fracture toughness, when compared with their TaC counterparts free from graphene. The key toughening micromechanisms are experimentally revealed to be bending and kinking of graphene platelets, sliding of graphene platelets, grain wrapping by graphene, crack bridging, graphene sheet pull-out and crack deflection [51]. In addition, during the sintering process, graphene sheets are sheared off graphene platelets in TaC-graphene nanocomposites [51].…”

Section: Fracture Behaviour Of Ceramic-graphene Nanocompositesmentioning

confidence: 99%

“…The key toughening micromechanisms are experimentally revealed to be bending and kinking of graphene platelets, sliding of graphene platelets, grain wrapping by graphene, crack bridging, graphene sheet pull-out and crack deflection [51]. In addition, during the sintering process, graphene sheets are sheared off graphene platelets in TaC-graphene nanocomposites [51]. As a corollary, an averaged thickness of graphene inclusions decreases, and their aspect ratio increases.…”

Section: Fracture Behaviour Of Ceramic-graphene Nanocompositesmentioning

confidence: 99%

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Micromechanics of fracturing in nanoceramics

Ovid’ko

2015

Phil. Trans. R. Soc. A.

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An overview of key experimental data and theoretical representations on fracture processes in nanoceramics is presented. The focuses are placed on crack growth in nanoceramics and their toughening micromechanics.Conventional toughening micromechanisms are discussed which effectively operate in both microcrystalline-matrix ceramics containing nanoinclusions and nanocrystalline-matrix ceramics. Particular attention is devoted to description of special (new) toughening micromechanisms related to nanoscale deformation occurring near crack tips in nanocrystalline-matrix ceramics. In addition, a new strategy for pronounced improvement of fracture toughness of ceramic materials through fabrication of ceramic-graphene nanocomposites is considered. Toughening micromechanisms are discussed which operate in such nanocomposites containing graphene platelets and/or few-layer sheets.

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Section: Fracture Processes In Nanoceramics: General Aspects and Key mentioning

confidence: 99%

Section: Fracture Behaviour Of Ceramic-graphene Nanocompositesmentioning

confidence: 99%

Section: Fracture Behaviour Of Ceramic-graphene Nanocompositesmentioning

confidence: 99%

Section: Fracture Behaviour Of Ceramic-graphene Nanocompositesmentioning

confidence: 99%

Section: Fracture Behaviour Of Ceramic-graphene Nanocompositesmentioning

confidence: 99%

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Micromechanics of fracturing in nanoceramics

Ovid’ko

2015

Phil. Trans. R. Soc. A.

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Spark Plasma Sintering of Alumina Composites with Graphene Platelets and Silicon Carbide Nanoparticles

Liu

Yan

et al. 2014

Adv Eng Mater

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This paper reports a study on sintering and characterization of alumina (Al2O3) ceramic composites with graphene platelets (GPLs) and silicon carbide (SiC) nanoparticles. 1, 3, and 5 vol% SiC and 0.38 vol% GPL are mixed with Al2O3 powders and sintered in a spark plasma sintering system. The microstructures and mechanical properties of the composites are investigated. It is found that the composites reinforced with the dual fillers exhibit more uniform and finer microstructures than pure Al2O3 and average grain sizes of the composites decrease with the increasing percentage of SiC. Compared with pure Al2O3, the composites show approximately a 36% increase in hardness, a 40% increase in flexural strength and a 50% increase in fracture toughness. Toughening mechanisms induced by GPLs, such as crack bridging, pullout and crack deflection in the composites, are observed and discussed.

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Spark Plasma Sintering and Characterization of Graphene Platelet/Ceramic Composites

Jiang

Liu

2014

Adv Eng Mater

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This paper reports a study on sintering and characterization of graphene platelet (GPL)-reinforced ceramic composites. Alumina (Al 2 O 3 ) and zirconia (ZrO 2 ) toughened Al 2 O 3 (ZTA) composites reinforced with GPLs are fabricated, respectively, using spark plasma sintering. The microstructures and mechanical properties of the sintered samples are investigated. It is found that the addition of GPLs hinders the growth of the ceramic matrix grains and help form homogenous microstructures of the ceramic matrices. Agglomeration of GPLs occurs during the fabrication process and formation of GPL aggregates is impeded when ceramic powders of smaller particle size and a shorter milling process are used. Fracture toughness of the ceramic matrices is significantly improved by introducing GPLs. Approximately, a 26.4% and a 29% improvements in fracture toughness are achieved for GPL/Al 2 O 3 and GPL/ZTA composites, respectively. The main toughening mechanisms induced by GPLs are pullout and crack bridging.

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Graphene NanoPlatelets reinforced tantalum carbide consolidated by spark plasma sintering

Abstract: false2016-03-16T23:02:09

Cited by 152 publications

References 89 publications

Micromechanics of fracturing in nanoceramics

Micromechanics of fracturing in nanoceramics

Spark Plasma Sintering of Alumina Composites with Graphene Platelets and Silicon Carbide Nanoparticles

Spark Plasma Sintering and Characterization of Graphene Platelet/Ceramic Composites

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