Carbon Nanotube‐Reinforced Ceramic Matrix Composites: Processing and Properties

Dassios, Konstantinos G.

doi:10.1002/9781118932995.ch15

Cited by 6 publications

(3 citation statements)

References 160 publications

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“…This finding independently confirms the previous claim that above a CNT loading threshold, side-effects such as nanotube agglomeration may impose adverse effects to the mechanical performance of the mortars. Such argumentation is fully compatible with previous findings that the advantageous effect of carbon nanotubes is limited to small concentrations, whereas less positive, or even adverse effects can be encountered at higher concentrations [67,68]. The trend of AE energy of GNP-modified mortars appears to reach a plateau at a concentration of 0.8 wt.%.…”

Section: Fracture Behavior With In Situ Ae Monitoringsupporting

confidence: 90%

Multifunctional Cement Mortars Enhanced with Graphene Nanoplatelets and Carbon Nanotubes

Dalla

Tragazikis

Trakakis

et al. 2021

Sensors

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Recent findings have brought forward the potential of carbon nano-species, especially nanotubes and graphene, to impart exceptional multifunctional potential to cement, offering simultaneous enhancement of mechanical, fracture mechanical and electrical properties. While available knowledge on the topic is still limited, there is a complete absence of direct comparisons of the potential of the nano-species to improve strength and toughness and provide multifunctionality to the mortars. The study offers a comprehensive overview of these potentials, for mortars modified with pure graphene nanoplatelets and carbon nanotubes at consistent, directly comparable, concentrations up to 1.2 wt.%. Testing included flexure under pure bending moments, axial compression, electrical resistivity measurements and fracture tests under three point bending configuration; the latter were also independently assessed by acoustic emission. Differences in documented properties and optimal concentrations associated with improved mechanical performance were directly compared and rationalized in terms of nanospecies morphology. Dramatic, statistically consistent improvements in fracture behavior, up to 10-fold of control values, were documented for specific nanofiller concentrations, indicating an excellent potential of the material system for contemporary smart construction applications. An exceptionally favorable comparison of acoustic emission and fracture energy data confirmed that the non-destructive technique can independently assess the fracture performance of mortars with exceptional precision.

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Section: Fracture Behavior With In Situ Ae Monitoringsupporting

confidence: 90%

Multifunctional Cement Mortars Enhanced with Graphene Nanoplatelets and Carbon Nanotubes

Dalla

Tragazikis

Trakakis

et al. 2021

Sensors

Self Cite

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“…A relevant enhancement in the tensile failure load of multiwalled CNTs was obtained in the ceramic environment and a new "multiwall" failure mechanism was discovered. Microstructural investigations by Dassios [57] specified the existence of highly dissipating nanoscale-specific toughening mechanisms acting complementary to CNT bridging and pullout, stipulating high potential and capabilities in a wide range of reinforcing and multifunctional applications.…”

Section: Cnt-based Cncsmentioning

confidence: 99%

An Overview on the Improvement of Mechanical Properties of Ceramics Nanocomposites

Silvestre

Brito

2015

Journal of Nanomaterials

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Due to their prominent properties (mechanical, stiffness, strength, thermal stability), ceramic composite materials (CMC) have been widely applied in automotive, industrial and aerospace engineering, as well as in biomedical and electronic devices. Because monolithic ceramics exhibit brittle behaviour and low electrical conductivity, CMCs have been greatly improved in the last decade. CMCs are produced from ceramic fibres embedded in a ceramic matrix, for which several ceramic materials (oxide or non-oxide) are used for the fibres and the matrix. Due to the large diversity of available fibres, the properties of CMCs can be adapted to achieve structural targets. They are especially valuable for structural components with demanding mechanical and thermal requirements. However, with the advent of nanoparticles in this century, the research interests in CMCs are now changing from classical reinforcement (e.g., microscale fibres) to new types of reinforcement at nanoscale. This review paper presents the current state of knowledge on processing and mechanical properties of a new generation of CMCs: Ceramics Nanocomposites (CNCs).

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“…[1][2][3][4][5] CNTs have exceptional mechanical properties [6][7][8][9][10] and due to their elastic modulus and mechanical strength, they have been used as reinforcement in metals, ceramics, and polymers. [11][12][13][14][15][16] However, the key to achieve good properties in these materials is a good dispersion and alignment control of the CNTs, which is difficult to do because their superficial area promotes the formation of clusters. Different techniques have been developed trying to resolve these problems.…”

Section: Introductionmentioning

confidence: 99%

Dispersion and alignment quantification of carbon nanotubes in a polyvinyl alcohol matrix

Ramírez

Sillas

et al. 2017

Journal of Composite Materials

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In recent years, due to their high specific mechanical properties, polymer matrix composites have been widely used. In particular, carbon nanotubes have been used as reinforcement because of their exceptional properties. In this work, the degree of dispersion and alignment of multiwalled carbon nanotubes into polyvinyl alcohol was quantified, which is a key information to optimize the mechanical properties of composites. For the dispersion of the multiwalled carbon nanotubes into the solution, a magnetic stirring and ultrasonic agitation were used. Finally, the mixture was dried to obtain a multiwalled carbon nanotubes reinforced polymer. The composites were mechanically stretched to obtain sheets with multiwalled carbon nanotubes aligned in the stretching direction. The layers obtained were prepared for transmission electron microscopy analysis. A dispersion quantification method based on the statistical distribution of horizontal and vertical separation distance between carbon nanotubes was used; a lognormal distribution was obtained. The angle of carbon nanotubes with respect to the stretching direction was used to quantify the alignment degree of carbon nanotubes. The bulk mechanical properties of the composites were measured by nanoindentation test; tensile test allowed to measure the mechanical properties of the composites in both the stretching and perpendicular directions to the stretching direction. Multiwalled carbon nanotubes showed a good dispersion and alignment degree and this, in conjunction with stretching, produced a high increase of both the stiffness and strength in the stretching direction, which allowed an increment of the mechanical properties measured by nanoindentation test; the best properties of the composites were reached with 0.5 wt% of MWCNTs.

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Carbon Nanotube‐Reinforced Ceramic Matrix Composites: Processing and Properties

Cited by 6 publications

References 160 publications

Multifunctional Cement Mortars Enhanced with Graphene Nanoplatelets and Carbon Nanotubes

Multifunctional Cement Mortars Enhanced with Graphene Nanoplatelets and Carbon Nanotubes

An Overview on the Improvement of Mechanical Properties of Ceramics Nanocomposites

Dispersion and alignment quantification of carbon nanotubes in a polyvinyl alcohol matrix

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