Boron nitride nanotubes as a reinforcement for brittle matrices

Tatarko, Peter; Grasso, Salvatore; Porwal, Harshit; Chlup, Zdeněk; Saggar, Richa; Dlouhý, Ivo; Reece, Michael J.

doi:10.1016/j.jeurceramsoc.2014.03.028

Cited by 27 publications

(21 citation statements)

References 29 publications

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“…This is associated with a reduction in the relative density of the nanocomposite. Such behaviour has been reported for graphene composites, 34 BNNT composites 18 and CNT composites. 35 The fracture toughness of the chevron notched beams as well as the flexural strength of BS and the BS-BNNS (1, 2.5 and 5 mass-%) composites are given in Table 1.…”

Section: Resultssupporting

confidence: 70%

“…It has been observed that the agglomeration of reinforcements can play a distinct role in lowering of the density by the creation of pores. 7,18,32,33 These agglomerates can additionally lower the density of glass by hindering the viscous flow of glass during sintering. 32 The XRD analysis of the as synthesised BNNSs revealed that they were highly crystalline with 99% single phase (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…41 Owing to the pulling out of the embedded nanosheets in the matrix, friction was generated between the interface of BNNS and BS glass, which helped in matrix relaxation and, in other way, contributed to the enhancement in toughening. 18,41 It was also observed that sometimes the outer BNNSs that were directly interacting with the BS glass remained attached to the matrix, while the inner BNNSs were only pulled out, leading us to believe that there was a strong interaction between the BNNS and BS interface while weak van der Waals interaction in between the BNNSs. All the toughening mechanisms described contributed effectively to the matrix in dissipation of deformation energy during fracture propagation and increase in the fracture toughness.…”

Section: Resultsmentioning

confidence: 99%

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Boron nitride nanosheets reinforced glass matrix composites

Saggar

Porwal

Tatarko

et al. 2015

Advances in Applied Ceramics

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The effect of reinforcing boron nitride nanosheets (BNNSs) on the mechanical properties of an amorphous borosilicate glass (BS) matrix was studied. The BNNSs were prepared using liquid exfoliation method and characterised by transmission electron microscopy, scanning electron microscopy and X-ray diffraction (XRD) analysis. The average length was ,0.5 mm, and thickness of the nanosheets was between 4 and 30 layers. These BNNSs were used to prepare BS-BNNS composite with different loading concentrations of 1, 2.5 and 5 mass-% (i.e. 1.395, 3.705 and 7.32 vol.-%). Spark plasma sintering (SPS) was used to densify these composites to avoid structural damages to the BNNSs and/or crystallisation within the composite sample during high temperature processing. The BNNSs were found to be evenly distributed in the composites matrix and were found to be aligned in an orientation perpendicular to the direction of the applied force in SPS. The mechanical properties including fracture toughness, flexural strength and elastic modulus were measured. Both fracture toughness and flexural strength increased linearly with increasing concentration of BNNSs in BS glass. There was an enhancement of ,45% in the fracture toughness (1.10 MPa.m 1/2 ) as well as flexural strength (118.82 MPa) with the addition of only 5 mass-% loading of BNNSs compared to BS glass (0.76 MPa.m 1/2 ; 82.16 MPa). The toughening mechanisms developed in the composites because of the reinforcement of BNNSs were thoroughly investigated.

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Section: Resultssupporting

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Boron nitride nanosheets reinforced glass matrix composites

Saggar

Porwal

Tatarko

et al. 2015

Advances in Applied Ceramics

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“…A smooth nonlinear bridging law can also be used to predict the nonlinear behaviour of composites containing multiple micro-cracks [66]. Recently, multiple micro-cracks bridged by boron nitride nanotubes have been found in brittle matrix composites [67]. Secondly, the Lawrence model [10], which has been used to establish the bridging law by Chen et al [16,17],andalsousedbyPaviaandCurtin [18], is based on the deformation and load transfer of a concentric cylinder where a fibre of a circular cross section is embedded in an outer cylindrical matrix shell.…”

Section: Bridging Lawsmentioning

confidence: 99%

A bridging law and its application to the analysis of toughness of carbon nanotube-reinforced composites and pull-out of fibres grafted with nanotubes

2015

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Bridging laws are essential in predicting the mechanical behaviour of conventional short-fibrereinforced composites and the emerging nanofibre-reinforced composites. In this paper, we first review some studies on the toughness of carbon nanotube-reinforced composites that is induced by the pull-out of the nanotubes from the matrix, and on the development of the corresponding bridging laws. A close examination of the available bridging laws for carbon nanotubes reveals that some fundamental issues need to be further addressed. We propose a simple nonlinear and smooth bridging law to describe the pull-out force-displacement behaviour of carbon nanotubes from a matrix. This law contains only two material parameters, reflects the basic features of the pull-out experiments, and is easy to use. We then use this bridging law to calculate the fracture toughness of carbon nanotube-reinforced nanocomposites and predict the pull-out force-displacement response of conventional short fibres that are grafted with carbon nanotubes. Some parametric studies are conducted to reveal the influence of various parameters at the nano-and micro-scale on these properties.

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“…Scratch resistance is an important property in many applications. [31][32][33] In the present work, the effect of GNP concentration on the scratch resistance of alumina was investigated by fabricating alumina-GNP (0.5, 2 and 5 vol.-%) composites using spark plasma sintering. The fabricated composites were tested using single pass scratch testing.…”

Section: Introductionmentioning

confidence: 99%

Scratch behaviour of graphene alumina nanocomposites

Porwal

Kašiarová

Tatarko

et al. 2015

Advances in Applied Ceramics

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The scratch resistance behaviour of alumina-graphene nanoplatelet (GNP) (0.5, 2 and 5 vol.-%) composites was investigated using a Rockwell indenter with normal applied loads ranging from 1 to 200 N. The alumina-GNP composites behaved differently during scratch testing depending on the normal applied load. The coefficient of friction of the composites did not change much at low normal loads but increased with increasing amount of GNP in the alumina matrix for high normal loads. The addition of GNP contributed to improved scratch resistance of alumina nanocomposites only for low loads below ,97 N. This correlates with the mechanical properties of the composites. As the applied load increased, the scratch resistance of the GNP composites decreased due to the presence of weakly bonded grain boundaries in the alumina matrix, which enhanced chipping of material.

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Boron nitride nanotubes as a reinforcement for brittle matrices

Cited by 27 publications

References 29 publications

Boron nitride nanosheets reinforced glass matrix composites

Boron nitride nanosheets reinforced glass matrix composites

A bridging law and its application to the analysis of toughness of carbon nanotube-reinforced composites and pull-out of fibres grafted with nanotubes

Scratch behaviour of graphene alumina nanocomposites

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