Graphene Nano-Platelets Reinforced ZrO&lt;SUB&gt;2&lt;/SUB&gt; Consolidated by Spark Plasma Sintering

Vu, Duc-Thuan; Young‐Hwan, Han; Fei, Chen; Jin, Dongqin; Schoenung, Julie M.; Dong‐Yeon, Lee

doi:10.1166/sam.2016.2485

Cited by 11 publications

(9 citation statements)

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“…Other authors have also observed deterioration in the hardness for graphene/alumina composites with increasing graphene content above a certain threshold value [41,42]. For the SPSed GNP/ZrO2 composite, the decrease in the micro-hardness for GNP concentrations ≥ 0.05 wt% was attributed to the induced grain yielding and slipping [43]. In our study, the decrease in the hardness is thought to be caused by the increased contribution of the GNP softer phase in the composites, since it has been reported that the hardness for the SPSed multilayered bulk graphene, obtained using the nanoindentation method, is less than 1 GPa [44], ten times smaller than for the 3YTZP.…”

Section: Hardness and Electrical Conductivity Of Gnp/3ytzp Compositesmentioning

confidence: 86%

Dense graphene nanoplatelet/yttria tetragonal zirconia composites: Processing, hardness and electrical conductivity

Gallardo-López

Márquez-Abril

Morales-Rodrı́guez

et al. 2017

Ceramics International

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Yttria tetragonal zirconia ceramic composites with 1, 2.5, 5 and 10 vol% nominal contents of graphene nanoplatelets (GNPs) were fabricated and characterized. First, the GNP dispersion in isopropanol was optimized to de-agglomerate the GNPs without damaging their structure. Then, submicrometric fully dense composites were obtained via spark plasma sintering (SPS) at 1250ºC with a 5 min holding time. The processing routine produced a nearly homogeneous GNP dispersion in the ceramic matrix, and the GNPs preferential orientation was perpendicular to the sintering compression axis. The Ceramic grain refinement due to the GNPs was also detected. The Vickers hardness measured on the plane perpendicular to the sintering compression axis (basal plane) was lower than on the cross sections. This anisotropy increased with the increasing GNP content, while the average hardness decreased. The electrical conductivity was also highly anisotropic, up to seven times higher for the basal planes. The electrical percolation threshold for these composites was estimated to be between 2.2 and 4.4 vol% of the GNP measured content.

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Section: Hardness and Electrical Conductivity Of Gnp/3ytzp Compositesmentioning

confidence: 86%

Dense graphene nanoplatelet/yttria tetragonal zirconia composites: Processing, hardness and electrical conductivity

Gallardo-López

Márquez-Abril

Morales-Rodrı́guez

et al. 2017

Ceramics International

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“…Both increasing the GBN content and reducing the GBN dimensions decrease the ceramic grain size. This combined effect can be explained by the accepted fact that the GBNs inhibit grain growth [8,25], and by the original fact that this effect is increased with improved homogeneity, which can be favored by reduced GBN dimensions. Figure 3 shows the relationship between the 3YTZP grain size and the GBN dimensions ((a) thickness and (b) aspect ratio)) for the 10 vol% GBN content composites.…”

Section: Resultsmentioning

confidence: 99%

Spark Plasma Sintered Zirconia Ceramic Composites with Graphene-Based Nanostructures

et al. 2018

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Abstract:The addition of graphene-based nanostructures (GBNs) can improve the inherent fragility of ceramics and provide them with improved electrical and thermal conductivities. However, both the starting material (ceramic matrix and GBNs) and the processing/sintering approach are crucial for the final composite microstructure and properties. This work focuses on the influence of the content and dimensions of the GBN filler (10 and 20 vol%; 3 and~150 layers), the powder-processing conditions (dry versus wet), and the homogenization method (ultrasound sonication versus high-energy planetary ball milling) on GBN/tetragonal zirconia (3YTZP) composites. The microstructure and electrical properties of the spark plasma sintered (SPS) composites were quantified and analyzed. The highest microstructural homogeneity with an isotropic microstructure was achieved by composites prepared with thicker GBNs milled in dry conditions. A high content (20 vol%) of few-layered graphene as a filler maximizes the electrical conductivity of the composites, although it hinders their densification.

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“…In the second place, the GBNs placed between the ceramic grains favour grain boundary sliding and therefore plastic deformation of the composite. This mechanism was proposed to account for the hardness decrease in ZrO 2 /GNP composites with GNP content higher than 0.05 wt% [29]. Vickers hardness [30].…”

Section: Microstructural Characterization Of the Compositesmentioning

confidence: 98%

Microstructure, interfaces and properties of 3YTZP ceramic composites with 10 and 20 vol% different graphene-based nanostructures as fillers

Muñoz-Ferreiro

Morales-Rodrı́guez

Rojas

et al. 2019

Journal of Alloys and Compounds

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The graphene family comprises not only single layer graphene but also graphene-based nanomaterials (GBN), with remarkably different number of layers, lateral dimension and price. In this work, two of these GBN, namely graphene nanoplatelets (GNP) with n~7-15 layers and few-layer graphene (FLG) with n~3 layers have been evaluated as fillers in 3 mol% yttria stabilized tetragonal zirconia (3YTZP) ceramic composites.Composites with 10 and 20 vol% GNP or FLG have been fabricated by wet powder processing and spark plasma sintering (SPS) and the influence of the content and number of layers of the graphene-based filler has been assessed. For both graphenebased fillers, an intermediate zirconia oxycarbide has been detected in the grain boundaries. The lower stacking degree and much more homogeneous distribution of the FLG, revealed by transmission electron microscopy (TEM), can improve load transfer between the GNPs and the ceramic matrix. However, high FLG contents lower densification of the composites, due partly to the larger FLG interplanar spacing also estimated by TEM. The hardness (both Vickers and nanoindentation) and the elastic modulus decrease with increased GBN content and with improved graphene dispersion.The FLG greatly inhibit the crack propagation that occur perpendicular to their preferential orientation plane. The composites with thinner FLG have higher electrical conductivity than those with GNP. The highest electrical conductivity is achieved by composites with 20 vol% FLG in the direction perpendicular to the compression axis during sintering, σ  = 3400 ± 500 Sm -1 .

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Graphene Nano-Platelets Reinforced ZrO<SUB>2</SUB> Consolidated by Spark Plasma Sintering

Cited by 11 publications

References 0 publications

Dense graphene nanoplatelet/yttria tetragonal zirconia composites: Processing, hardness and electrical conductivity

Dense graphene nanoplatelet/yttria tetragonal zirconia composites: Processing, hardness and electrical conductivity

Spark Plasma Sintered Zirconia Ceramic Composites with Graphene-Based Nanostructures

Microstructure, interfaces and properties of 3YTZP ceramic composites with 10 and 20 vol% different graphene-based nanostructures as fillers

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Graphene Nano-Platelets Reinforced ZrO<SUB>2</SUB> Consolidated by Spark Plasma Sintering

Cited by 11 publications

References 0 publications

Dense graphene nanoplatelet/yttria tetragonal zirconia composites: Processing, hardness and electrical conductivity

Dense graphene nanoplatelet/yttria tetragonal zirconia composites: Processing, hardness and electrical conductivity

Spark Plasma Sintered Zirconia Ceramic Composites with Graphene-Based Nanostructures

Microstructure, interfaces and properties of 3YTZP ceramic composites with 10 and 20 vol% different graphene-based nanostructures as fillers

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Microstructure, interfaces and properties of 3YTZP ceramic composites with 10 and 20 vol% different graphene-based nanostructures as fillers