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Mohanty, Akash

A Comparative Study of Novel Tribological Response of Hybrid Epoxy Composites Reinforced by MWCNT/ Graphene/Nanodiamond

Abstract Views :347 | PDF Views:2

Authors

Baljit Singh ¹, Akash Mohanty ¹

Affiliations
1 School of Mechanical Engineering, VIT University, Vellore-632014, Tamil Nadu, IN

Source

Journal of Surface Science and Technology, Vol 35, No 1-2 (2019), Pagination: 36-44

Abstract

This paper investigates the tribological properties of MWCNT/Graphene (GnP)/ Nanodiamond (NDs) reinforced hybrid epoxy composites. In this paper, the hardness, surface roughness and wear properties of epoxy with MWCNT/NDs, Graphene/NDs, and MWCNT/ Graphene reinforced epoxy composites have been investigated using a Vicker hardness tester, surface roughness tester and reciprocating wear tester respectively. Hardness evaluated using the diagonal length (Hv, l) and by the indentation depth (Hv, d) of thermoset polymers, epoxy resin, was carried out. In addition filler, very much enhances the wear properties of the epoxy resin, by reducing the friction coefficient and wear rate. The result of different fillers on the tribological behaviour of an epoxy has been studied using untreated MWCNT, Graphene, NDs and mixture of MWCNT/NDs, Graphene/NDs and MWCNT/Graphene. Addition of filler greatly enhances the tribological properties of epoxy resin.

Keywords

Epoxy, Graphene (GnP), MWCNTs, Nano-Diamond (NDs).

Full Text

References

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Wear and Hardness Studies of Graphene Decorated with Graphene Quantum Dots (G-D-GQD) Embedded Epoxy Nano Composites

Abstract Views :268 | PDF Views:3

Authors

Manuel George ¹, Akash Mohanty ¹

Affiliations
1 School of Mechanical Engineering, VIT University, Vellore – 632014, Tamil Nadu, IN

Source

Journal of Surface Science and Technology, Vol 35, No 1-2 (2019), Pagination: 45-53

Abstract

The paper discusses about the wear and micro hardness behavior of Graphene Decorated with Graphene Quantum Dots (G-D-GQD) reinforced epoxy composites. The samples were prepared by open mold casting method by adding 0.25–1 wt. % (in an interval of 0.25%) of GDGQD and evaluated on a reciprocating wear tester configuration for wear and coefficient of friction properties. The micro-hardness testing of the G-D-GQD particles embedded epoxy composites has been performed and the hardness value results were compared with neat epoxy to find the improvement in hardness. Significant improvements in the hardness and wear resistance of the epoxy nanocomposites was obtained by the embedding of G-DGQD fillers, which is due to the efficient bonding of GDGQD filler with the epoxy matrix. Scanning Electron Microscope (SEM) images of the worn composites were analysed to get an insight into the morphology of the surfaces. Furthermore, the coefficient of friction of the composites got increased with the wt. % of fillers in the base material, but due to the superior bond strength and lesser agglomeration of the particles, the Vicker’s hardness improved and the wear loss reduced. Hence the surface area coverage of G-D-GQDs got a significant role in the reduced wear loss and thereby coming to a threshold value. The study concludes by suggesting that 0.25 wt. % GDGQD/epoxy composites shown a least wear rate and increased hardness of 0.023% and 26%, respectively thereby suggesting application involving reduced wear rates.

Keywords

Graphene Decorated Graphene Quantum Dots (G-D-GQD), SEM, Epoxy Composites, Wear and Hardness.

Full Text

References

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Compressive Strength Evaluation of Nanodiamond/ MWCNT/Graphene Reinforced Novel Hybrid Polymer Nano Composites

Abstract Views :214 | PDF Views:1

Authors

Baljit Singh ¹, Akash Mohanty ¹

Affiliations
1 School of Mechanical Engineering, Vellore Institute of Technology, Vellore - 632014, Tamil Nadu, IN

Source

Journal of Surface Science and Technology, Vol 36, No 1-2 (2020), Pagination: 75–81

Abstract

Because of the inherent brittleness property of monolithic epoxy, it fails to prevent crack propagation and is hence vulnerable to the catastrophic failure. Nano-fillers, such as CNT/Graphene (GnP)/Nanodiamond (NDs) and other carbonaceous materials increase its ability to withstand crack propagation thus its fracture strength propitiously improved. This paper studies compressive properties of MWCNT/GnP/NDs on epoxy based composite material. A static uniaxial compression test was conducted in order to study the effect of these fillers on the compressive stress-strain behaviour of such composites. In this study, the MWCNT/GnP/NDs are added individually as 0.2 wt% and for the hybrid composite, 0.1 wt. % of NDs is added separately along with 0.1 wt% of MWCNT and GnP to the epoxy matrix. The bonding between MWCNT/GnP/NDs with the epoxy matrix is confirmed by microscopic observations. The results showed that the individual addition of 0.2 wt% of MWCNT/GnP/NDs, improves the compressive strength whereas the hybrid composite produced a declining trend. The reverse trend was also observed for the modulus value of the above mentioned composite materials.

Keywords

Epoxy, Graphene (GnP), MWCNT, Nanodiamond (NDs).

Full Text

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Study of Water Absorption Properties of Annealed Nanodiamond/Epoxy Nanocomposites

Abstract Views :160 | PDF Views:0

Authors

Baljit Singh ¹, Akash Mohanty ²

Affiliations
1 School of Mechanical Engineering, Vellore Institute of Technology, Vellore – 632014, Tamil Nadu, NI
2 School of Mechanical Engineering, Vellore Institute of Technology, Vellore – 632014, Tamil Nadu, IN

Source

Journal of Surface Science and Technology, Vol 37, No 1-2 (2021), Pagination: 15-21

Abstract

Water absorption behavior of annealed Nanodiamond (ND) particle filled epoxy composite, has been studied. Removal of impurity present in the pristine ND and its surface modifications, were carried out by heat treatment. Different weight percent of ND (0.1, 0.3 and .05 wt. %) were incorporated in a commercial grade epoxy resin (L-12) in a controlled manner. A good and homogeneous distribution of ND in the composite, was observed. This resulted in reduction of mobility of the epoxy chain due to formation of highly immobile mono-layers around ND as well as formation of hydrogen bond between the ND and the epoxy. The water absorption and the contact angle properties of the resulting composites are measured. The results indicate that the water absorption as well as contact angle of the composite decrease with the increase of incorporated ND. It is observed that incorporation of ND into epoxy matrix, enhances the water resistance property of the composite.

Keywords

Epoxy, Nanodiamond, SEM.

Full Text

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Investigation of the Effect of Graphene Nanoplatelet content on Flexural Behavior, Surface Roughness and Water Absorption of a Graphene Nanoplatelets Reinforced Epoxy Nanocomposites

Abstract Views :155 | PDF Views:0

Authors

A. Kesavulu ¹, Akash Mohanty ¹

Affiliations
1 School of Mechanical Engineering, Vellore Institute of Technology, Vellore – 632014, Tamil Nadu, IN

Source

Journal of Surface Science and Technology, Vol 37, No 1-2 (2021), Pagination: 35-42

Abstract

In the present work, the effect of Graphene nanoPlatelets (GnP) content on the flexural, surface roughness, and water absorption behavior of a GnP reinforced epoxy composite was investigated. Different wt.% of GnP (0.25, 0.5, 0.75, and 1 wt.%) was added into the epoxy matrix through the sonication method followed by the ball milling. The results indicate a significant enhancement in the flexural properties of the epoxy nanocomposite with the addition of GnP in the epoxy matrix. The optimum enhancement in the properties was obtained at 0.25 wt.% GnP incorporated epoxy composites. The increase in flexural strength and flexural modulus results were noticed as 42.7% and 49.2% when compared with neat epoxy. The surface roughness value for the loading of 0.25 wt.% of GnP into the epoxy showed a drop of 48.7% when compared with that of the neat epoxy sample. The loading of 0.25 wt.% of GnP into the epoxy also reduces the water absorption from 0.125% for the neat epoxy sample to 0.067% for the composite sample. The Scanning Electron Microscope (SEM) images of the fractured surface (flexural samples) of the GnP embedded epoxy composites show the river like pattern, which is the result of the better dispersion of the GnP in the epoxy matrix and thus shows improvement in flexural behaviour of such composite materials.

Keywords

Epoxy, Graphene nanoPlatelets (GnP), Surface Roughness, Water Absorption.

Full Text

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