Toughening mechanisms and mechanical properties of graphene nanosheet-reinforced alumina

The updated results on the relevant properties of graphene reinforced ceramic are reviewed. The representative data for a wide number of bulk composites are compared, making special emphasis on the mechanical properties (fracture toughness, strength), wear and friction characteristics, and elastic properties. The electrical functionality boosted by the contacted graphene network is critically assessed for conducting and dielectric matrices. Regarding thermal transport, the enhancement or depletion of thermal conductivity is revised considering for different matrices and for specific orientations. Furthermore, new developments on layered and coatings, as well as in cellular composites that certainly widen the scope of applications for these remarkable group of ceramic composites are looked over. AbstractThe updated results on the relevant properties of graphene reinforced ceramic are reviewed.The representative data for a wide number of bulk composites are compared, making special emphasis on the mechanical properties (fracture toughness, strength), wear and friction characteristics, and elastic properties. The electrical functionality boosted by the contacted graphene network is critically assessed for conducting and dielectric matrices.Regarding thermal transport, the enhancement or depletion of thermal conductivity is revised considering for different matrices and for specific orientations. Furthermore, new developments on layered and coatings, as well as in cellular composites that certainly widen the scope of applications for these remarkable group of ceramic composites are looked over.

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“…Examples of the interference of the flat nanostructures with crack paths in ceramic/graphene composites. Adapted from references [12,19,39].…”

Section: Microscopic Observation Of Indentation Cracks Often Reveals mentioning

confidence: 99%

From bulk to cellular structures: A review on ceramic/graphene filler composites

Miranzo

Belmonte

Osendi

2017

Journal of the European Ceramic Society

138

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“…Under an applied load, the folded GNS plane slides along the base plane without any dislocation movement. Therefore, it is easy for cracks to propagate if the GNS is distributed along the grain boundaries, and as a result, an intergranular fracture is produced [72]. Folds can be formed by grapheme lattice deformation, which is caused by attached functional groups (OH) or as a result of GNS stacking, accumulation during matrix grain growth, and reaction at the interface [73].…”

Section: Non-chemical Combinationmentioning

confidence: 99%

Research on the interface properties and strengthening–toughening mechanism of nanocarbon-toughened ceramic matrix composites

Liu

Jiang

Shi

et al. 2020

Nanotechnology Reviews

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AbstractNanocarbon materials (carbon nanotubes, graphene, graphene oxide, reduced graphene oxide, etc.) are considered the ideal toughening phase of ceramic matrix composites because of their unique structures and excellent properties. The strengthening and toughening effect of nanocarbon is attributed to several factors, such as their dispersibility in the matrix, interfacial bonding state with the matrix, and structural alteration. In this paper, the development state of nanocarbon-toughened ceramic matrix composites is reviewed based on the preparation methods and basic properties of nanocarbon-reinforced ceramic matrix composites. The assessment is implemented in terms of the influence of the interface bonding condition on the basic properties of ceramic matrix composites and the methods used to improve the interface bonding. Furthermore, the strengthening and toughening mechanisms of nanocarbon-toughened ceramic matrix composites are considered. Moreover, the key problems and perspectives of research work relating to nanocarbon-toughened ceramic matrix composites are highlighted.

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“…reported that the presence of GNPs in a Ti6Al4V matrix with a large specific area of 2D structure was expected to impede the coarsening of the matrix grains during thermal processing. Compared with pure alumina, there was about a 20% and 46% reduction in the average grain sizes with the incorporation of 0.25 and 0.5 wt% GNPs, respectively . Similarly, Liu et al .…”

Section: Introductionmentioning

confidence: 72%

“…Graphene has been proposed as a potential reinforcement for metal and ceramic composites, which might be attributed to its high specific surface area and the fact that it does not form agglomerates in the matrix when handled carefully . Ahmad et al . found that, compared with monolithic alumina, there was an increase in the fracture toughness (by 72%) and hardness (7%) in a 0.50 wt% graphene nanoplatelet (GNP)/alumina composite.…”

Section: Introductionmentioning

confidence: 99%

Reduced Graphene Oxide–Refined Cu Matrix Composites: An Experimental and First‐Principles Study

Yan

Hong

Chen

et al. 2019

Crystal Research and Technology

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Reduced graphene oxide/copper matrix composites (RGO/Cu) are successfully fabricated via powder metallurgy methods. Composite powders of electrolytic Cu and 0.5 or 1.0 wt% graphene oxide (GO) are prepared by high‐energy ball milling. The composites are then consolidated using hot‐press sintering with a pressure of 22 MPa at 800 °C under a vacuum of 2 × 10−2 Pa. Microstructural observations of the RGO formed from GO show that it is located along the Cu grain boundaries and CuO nanoparticles distributed inside the Cu grain. The average grain sizes are 30.11 (pure Cu), 24.75 (0.5 wt% RGO/Cu composites), and 19.66 µm (1.0 wt% RGO/Cu composites). The Vickers hardness and tensile strengths of the RGO/Cu composites are higher than those of pure Cu. Theoretical research based on first‐principles calculations shows that oxygen atoms from the decomposition of GO react with Cu to form CuO nanoparticles. This secondary phase behaves as a pin that hinders the growth of copper grains. The covalent bonding between RGO and Cu slightly limits the movement of neighboring Cu atoms. More importantly, the grain refinement mechanism is related to the RGO retarding the diffusion of Cu atoms along the interface of copper grains due to its large activation energy.

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Toughening mechanisms and mechanical properties of graphene nanosheet-reinforced alumina

Cited by 112 publications

References 48 publications

From bulk to cellular structures: A review on ceramic/graphene filler composites

From bulk to cellular structures: A review on ceramic/graphene filler composites

Research on the interface properties and strengthening–toughening mechanism of nanocarbon-toughened ceramic matrix composites

Reduced Graphene Oxide–Refined Cu Matrix Composites: An Experimental and First‐Principles Study

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