Effects of graphene on morphology, fracture toughness, and electrical conductivity of titanium dioxide

Nadaraia, L.; Jalabadze, Nikoloz; Khundadze, L.; Rurua, Lamara; Japaridze, M.; Chedia, Roin

doi:10.1016/j.diamond.2021.108319

Cited by 12 publications

(15 citation statements)

References 39 publications

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“…When the diamond content is 10 wt.%, a high hardness of 14.5 GPa is present. In addition, it should be noted that this hardness (14.5 GPa) is higher than the hardness of titania-based composites reported in previous literature (9.8 GPa [ 10 ], 8.7 GPa [ 12 ], 9.2~10.6 GPa [ 13 ], 9.0 GPa [ 19 ]), although the hardness decreases slightly with the increase of diamond content. Figure 7 shows the bending strength of synthesized samples.…”

Section: Resultscontrasting

confidence: 54%

“…For example, Miao et al [ 10 ] prepared titania-yttria-stabilized tetragonal zirconia (TiO 2 /15 vol%-Y-TZP) composites, which have a hardness value of 9.8 GPa, bending strength of 160 MPa, and fracture toughness of 3.8 MPa·m 1/2 . Nadaraia et al [ 13 ] produced titania–graphene nanoplatelet (TiO 2 /GNP) composites using the spark plasma sintering (SPS) technique. The hardness of TiO 2 /GNP composites is in the range of 9.2~10.6 GPa, and the fracture toughness is in the range of 2.3~9.6 MPa·m 1/2 , indicating the great potential of carbon materials as a reinforcement to enhance the mechanical properties of TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

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Effects of Diamond on Microstructure, Fracture Toughness, and Tribological Properties of TiO2-Diamond Composites

et al. 2022

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The reinforcements represented by graphene nanoplatelets, graphite, and carbon nanotubes have demonstrated the great potential of carbon materials as reinforcements to enhance the mechanical properties of TiO2. However, it is difficult to successfully prepare TiO2-diamond composites because diamond is highly susceptible to oxidation or graphitization at relatively high sintering temperatures. In this work, the TiO2-diamond composites were successfully prepared using high-pressure sintering. The effect of diamond on the phase composition, microstructure, mechanical properties, and tribological properties was systemically investigated. Diamond can improve fracture toughness by the crack deflection mechanism. Furthermore, the addition of diamond can also significantly reduce the friction coefficient. The composite composed of 10 wt.% diamond exhibits optimum mechanical and tribological properties, with a hardness of 14.5 GPa, bending strength of 205.2 MPa, fracture toughness of 3.5 MPa∙m1/2, and a friction coefficient of 0.3. These results enlarge the family of titania-based composites and provide a feasible approach for the preparation of TiO2-diamond composites.

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Section: Resultscontrasting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Effects of Diamond on Microstructure, Fracture Toughness, and Tribological Properties of TiO2-Diamond Composites

et al. 2022

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“…The subsequent compression to the density of ρ = 0.20 g/cm 3 is accompanied by an increase in electrical conductivity by five orders of magnitude. At density ρ = 0.95 g/cm 3 , the electrical conductivity reaches its maximum value σ = 0.95 (Ohm⋅cm) −1 . Further increase in density up to ρ ≅ 2.04 g/cm 3 , on the contrary, leads to a decrease in the specific electrical conductivity by 7%.…”

Section: Resultsmentioning

confidence: 99%

“…For the studied sample of the disordered pure TEG array (Fig. 1, a) under load, the transition to the conductive state is at a density of ρcr = 0.19 g/cm 3 , and a corresponding value of the specific electrical conductivity is σ = 5,1⋅10 −6 (Ohm⋅cm) −1 . The subsequent compression to the density of ρ = 0.20 g/cm 3 is accompanied by an increase in electrical conductivity by five orders of magnitude.…”

Section: Resultsmentioning

confidence: 99%

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Electrophysical Properties of Composites Based on Hydrogenated Titanium with Different Contents of Thermally Expanded Graphite

Mykhailova¹,

Len²,

Yakymchuk³

et al. 2022

Metallofiz. Noveishie Tekhnol.

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The formation of carbon-containing composites based on metals opens the prospect of combining the advantages of their components and manifesting new electrophysical properties, which are not characteristic of the original materials. Mechanical synthesis of hydrogenated titanium (TiH) and thermally expanded graphite (TEG) powders leads to such composites formation. As shown, the increase by 1.65 and 6.3 times in their electrical conductivity is observed in comparison with original TiH and TEG components, respectively. It is due to an increase of free electrons in the TEG because of their transport from the metal component.

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Thermal, mechanical, thermo‐mechanical and morphological properties of graphene nanoplatelets reinforced green epoxy nanocomposites

Yusuf,

Sapuan,

Rashid

et al. 2023

Polymer Composites

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The efficient inclusion of GNPs (graphene nanoplatelets) as an effective nano‐fillers for green polymer matrices produced with 28% of carbon originating from biomass tends to significantly improve mechanical and thermal properties. In the present work, green epoxy nanocomposites with low loading of (0.1, 0.25, and 0.5) wt% of the GNPs were made using a solution blending technique using acetone as the solvent. In mechanical stirring, the ultrasonic bath was used to ensure the efficient dispersion of GNPs within green epoxy. The resulting nanocomposites were comprehensively characterized and compared to unfilled green epoxy. Different tools were used to appraise morphological, thermal, thermo‐mechanical, and mechanical behavior. The results confirmed through FE‐SEM showed an optimal dispersion of GNPs with nanocomposites. The thermal degradation temperature (Td) of GNPs curve with 0.25 wt% loading was shifted toward higher temperature (from 336°C to 342°C) due to low percentage of loading of GNPs which showed an enhance thermal stability of polymer matrix with 0.25 wt% loading. The mechanical results were also in lined with previously published literature, in the tensile test 6.45% and hardness 13.3% increment was achieved. Overall, the results underscored significant improvements in green nanocomposite performance with low wt% of GNPs.Highlights The study focuses on development and characterization of green epoxy nanocomposites, which utilize environmentally friendly materials as a matrix, highlighting the significance of sustainability. The study explores effects of low loading of GNPs in green epoxy nanocomposites. The results demonstrate significant improvements in mechanical and thermal properties with optimized presence of GNPs. This investigation provides insights into optimal amount of GNPs required to achieve improved properties. Research evaluates multifaceted analysis provides a holistic understanding of performance enhancements achieved through inclusion of GNPs.

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Effects of graphene on morphology, fracture toughness, and electrical conductivity of titanium dioxide

Cited by 12 publications

References 39 publications

Effects of Diamond on Microstructure, Fracture Toughness, and Tribological Properties of TiO2-Diamond Composites

Effects of Diamond on Microstructure, Fracture Toughness, and Tribological Properties of TiO2-Diamond Composites

Electrophysical Properties of Composites Based on Hydrogenated Titanium with Different Contents of Thermally Expanded Graphite

Thermal, mechanical, thermo‐mechanical and morphological properties of graphene nanoplatelets reinforced green epoxy nanocomposites

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