Fracture toughness and toughening mechanisms in graphene platelet reinforced Si3N4 composites

Kvetková, Lenka; Duszová, Annamária; Hvizdoš, Pavol; Dusza, Ján; Kun, Péter; Balázsi, Csaba

doi:10.1016/j.scriptamat.2012.02.009

Cited by 206 publications

(93 citation statements)

References 20 publications

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“…This is primarily due to the lubricant nature of carbon nanofillers which is responsible for deeper penetration on the Vickers indenter during the indentation. These observations for the hardness of nanocomposites are in consistent with the studies conducted by different groups [3,7,[37][38]. It is interesting to note that there is no significant difference in hardness for the different types of nanocomposites.…”

Section: Resultssupporting

confidence: 90%

“…However, very small change in electrical conductivity was observed for CB nanocomposites. As reported [7,10], CNTs are responsible for improving fracture toughness of ceramics. As compared to CB nanocomposite, less damage was produced in CNT nanocomposites but a sharp decrease in electrical conductivity was observed.…”

Section: Resultsmentioning

confidence: 69%

“…They have been widely researched for their addition in polymer [2], ceramic [3][4][5][6][7] and metal [8] nanocomposites owing to the outstanding mechanical, thermal, and electronic properties attributed to them. Composite materials, filled with carbon nanofillers, are being researched for emerging applications like energy, transportation, defence, automotive, aerospace, sporting goods, and infrastructure sectors [9].…”

Section: Introductionmentioning

confidence: 99%

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Structural health monitoring capabilities in ceramic–carbon nanocomposites

Bhat

Daoush

2014

Ceramics International

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractA novel method for analysing structural health of alumina nanocomposites filled with graphene nanoplatelets (GNP), carbon nanotubes (CNTs) and carbon black nano-particles (CB) is presented. All nanocomposites were prepared using novel colloidal processing and then by Spark Plasma Sintering.Good homogeneous dispersion was observed for all carbon filled materials. Nanocomposite bars were indented to produce sub-surface damage. Change in electrical conductivities were analysed after indentation to understand structural damage. For correlating change in electrical conductivity and Page 2 of 15 indentation damage and understanding damage tolerance, mechanical properties were compared.Because of the systematically induced indentation damage, a sharp decrease of 86% was observed in the electrical conductivity of CNT nanocomposite as compared to 69% and 27% in the electrical conductivities of GNP nanocomposites and CB nanocomposites respectively. CNTs impart superior damage sensing capability in alumina nanocomposites, in comparison to GNP and CB, due to their fibrous nature, high aspect ratio and high electrical conductivity.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

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Structural health monitoring capabilities in ceramic–carbon nanocomposites

Bhat

Daoush

2014

Ceramics International

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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 Keymentioning

confidence: 99%

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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“…Ramirez et al [13] studied the electrical conductivity, which could be improved with a maximum of 40 S cm −1 by 25 vol.% multilayer graphene (MLG) addition. Dusza [14] and Kvetková et al [15] studied the various types MLG added in 1 wt% to the Si 3 N 4 composite. They both reported considerable improvement on the mechanical properties regardless of the type of the used MLG.…”

Section: Introductionmentioning

confidence: 99%

Spark plasma sintering of Si₃N₄/multilayer graphene composites

et al. 2014

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Mulitlayer graphene reinforced silicon nitride composites were prepared by spark plasma sintering to investigate the effect of the graphene addition on mechanical properties. The composites contained multilayer graphene (MLG) in various (0, 1, 3 and 5 wt%) content. Significantly higher fracture toughness of 8.0 MPa m 1/2 was obtained at 1% MLG content, however, on further increasing the graphene content the toughness did not increase, but dropped to the value of the monolithic silicon nitride. The maximum hardness of 18.8 MPa was also obtained at 1% MLG, while at higher MLG contents it gradually decreased.

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Fracture toughness and toughening mechanisms in graphene platelet reinforced Si3N4 composites

Cited by 206 publications

References 20 publications

Structural health monitoring capabilities in ceramic–carbon nanocomposites

Structural health monitoring capabilities in ceramic–carbon nanocomposites

Micromechanics of fracturing in nanoceramics

Spark plasma sintering of Si₃N₄/multilayer graphene composites

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Fracture toughness and toughening mechanisms in graphene platelet reinforced Si3N4 composites

Cited by 206 publications

References 20 publications

Structural health monitoring capabilities in ceramic–carbon nanocomposites

Structural health monitoring capabilities in ceramic–carbon nanocomposites

Micromechanics of fracturing in nanoceramics

Spark plasma sintering of Si3N4/multilayer graphene composites

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Product

Resources

About

Spark plasma sintering of Si₃N₄/multilayer graphene composites