Inclined slit-based pullout method for determining interfacial strength of multi-walled carbon nanotube–alumina composites

Nozaka, Yo; Wang, Weili; Shirasu, Keiichi; Yamamoto, Go; Hashida, Toshiyuki

doi:10.1016/j.carbon.2014.07.024

Cited by 19 publications

(6 citation statements)

References 23 publications

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“…Note that such interfacial strengths are expected to be underestimated since the MWCNTs used in this study undergo failure in the swordin-sheath manner which cannot be observed clearly through the SEM. However, these values are in the range of previous studies [39][40][41], supporting the validity of this estimation. As mentioned above, the nanodefects are introduced on the surface of the acid-treated MWCNTs, and the density of defects increases with the increasing acid-treatment time.…”

Section: Quantitative Evaluation Of Composite Microstructuressupporting

confidence: 83%

Relationship between microstructure and mechanical properties in acid-treated carbon nanotube-reinforced alumina composites

et al. 2015

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Alumina composites reinforced with multiwalled carbon nanotubes (MWCNTs) at up to 3.7 vol% are prepared by a precursor method followed by a spark plasma sintering. We systematically and quantitatively investigate the effects of acid-treatment time of the MWCNTs on not only bending strength and fracture toughness of the composites but also on the mechanical strength and dispersibility of the MWCNTs, the grain size of the alumina matrix, and the interfacial strength between MWCNT and alumina. The main objective of this study is to evaluate how these parameters influence the mechanical properties with the aid of multiple regression analysis. We demonstrate that the matrix grain size, the mechanical strength of the MWCNTs, and the interfacial strength have little impact on the mechanical properties for the composites prepared in this study. On the other hand, the dispersibility of MWCNTs has the significant influence on the mechanical properties. Both the dispersibility of the MWCNTs and the mechanical properties of the composites increase as the acid-treatment time increases up to 2 h at low MWCNT content (0.9 vol%). Conversely, at a higher amount of MWCNTs, the degradation in the mechanical properties is shown to be associated with the deterioration of MWCNTs' dispersibility. As MWCNT agglomerates are anticipated to act as imperfections, they may override the effects of the strength of MWCNTs, matrix grain size, and interfacial strength. By means of the multiple regression analysis, we quantitatively show that improving MWCNTs' dispersibility is one of the most important factors in enhancing the mechanical properties of MWCNT/alumina composites.

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Section: Quantitative Evaluation Of Composite Microstructuressupporting

confidence: 83%

Relationship between microstructure and mechanical properties in acid-treated carbon nanotube-reinforced alumina composites

et al. 2015

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“…The IFSS of the CNT in Fig. 1 Nozaka et al [11] using a nanomanipulator to pull CNTs from an alumina matrix. Therefore, the interfacial properties between CNT and ceramic matrices can be measured in-situ by combining a simple microfabricated device with a quantitative nanoindenter inside a SEM.…”

Section: Resultsmentioning

confidence: 99%

“…Unfortunately, this method cannot be extended to pull out the CNTs from ceramics, which would require sintering of ceramic matrix with an embedded CNT at high temperature. Nozaka et al [11] developed an inclined slit-based pullout (ISP) method, which utilized a nanomanipulator driven AFM probe inside scanning electron microscope (SEM) to pull out a protruding CNT. The interfacial strength between CNT and alumina matrix was measured to be 19.2 ± 6.6 MPa.…”

Section: Introductionmentioning

confidence: 99%

Quantification and promotion of interfacial interactions between carbon nanotubes and polymer derived ceramics

Yang

Liang

Chen

et al. 2015

Carbon

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a b s t r a c tCarbon nanotubes (CNTs) have been considered an ideal reinforcement for light-weight and highstrength ceramic matrix composites. Understanding the interfacial properties between CNTs and the matrix is crucial for engineering the desired properties in such composites. Here in-situ pull-out experiments with a polymer derived ceramic (PDC) matrix are carried out with both pristine CNTs and CNTs coated with Al 2 O 3 (CNT/Al 2 O 3 ) produced by Atomic Layer Deposition (ALD), using micro-fabricated devices in a scanning electron microscope. This carefully designed comparative study makes it possible to better understand the interfacial interactions between CNTs and PDC matrices. The interfacial shear strength (IFSS) of CNT-PDC is 9.99 ± 2.84 MPa, while the IFSS of (CNT/Al 2 O 3 )/PDC with~3 nm Al 2 O 3 coating thickness is 14.52 ± 2.66 MPa, demonstrating a 45.3% improvement. The non-linear failure observed with the coated CNTs is also indicative of energy dissipation mechanisms that promote toughening in ceramic matrix composites. The improved properties in (CNT/Al 2 O 3 )/PDC are believed to originate from increased surface roughness, which leads to mechanical interlocking at the interface during the pull-out process. The combination of special interlayer structures such as ALD Al 2 O 3 and strong CNTs opens up interesting opportunities for improving the mechanical properties of ceramic nanocomposites reinforced by CNTs.

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“…They reported that the estimated tensile strength of the nanocomposite based on the shear lag model using the obtained IFSS values is consistent with the experimental ones. To date, the direct microscopic method for determination of IFSS values have also been employed for CNT-filled ceramic [160] and polymer [161] matrix nanocomposites. It is inferred that the tensile strength of the nanocomposites can be maximized by thickening the interfacial region through the formation of a crystalline coating around CNTs or their functionalization or in situ formation of metal oxide/carbide interlayer at boundary zones.…”

Section: Partial Chemical Reactionmentioning

confidence: 99%

Metallurgical Challenges in Carbon Nanotube-Reinforced Metal Matrix Nanocomposites

Azarniya

Safavi

Sovizi

et al. 2017

Metals

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Abstract:The inclusion of carbon nanotubes (CNTs) into metallic systems has been the main focus of recent literature. The aim behind this approach has been the development of a new property or improvement of an inferior one in CNT-dispersed metal matrix nanocomposites. Although it has opened up new possibilities for promising engineering applications, some practical challenges have restricted the full exploitation of CNTs' unique characteristics. Non-uniform dispersion of CNTs in the metallic matrix, poor interfacial adhesion at the CNT/metal interface, the unfavorable chemical reaction of CNTs with the matrix, and low compactability are the most significant challenges, requiring more examination. The present paper provides a broad overview of the mentioned challenges, the way they occur, and their adverse influences on the physicomechanical properties of CNT-reinforced metal matrix nanocomposites. The suggested solutions to these issues are fully addressed.

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Inclined slit-based pullout method for determining interfacial strength of multi-walled carbon nanotube–alumina composites

Cited by 19 publications

References 23 publications

Relationship between microstructure and mechanical properties in acid-treated carbon nanotube-reinforced alumina composites

Relationship between microstructure and mechanical properties in acid-treated carbon nanotube-reinforced alumina composites

Quantification and promotion of interfacial interactions between carbon nanotubes and polymer derived ceramics

Metallurgical Challenges in Carbon Nanotube-Reinforced Metal Matrix Nanocomposites

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