Enhanced properties of nanostructured ZrO2–graphene composites rapidly sintered via high-frequency induction heating

Kwon, So-Mang; Lee, Seok-Jae; Shon, In-Jin

doi:10.1016/j.ceramint.2014.08.042

Cited by 65 publications

(26 citation statements)

References 29 publications

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“…The limited existing studies on graphene/zirconia composites mostly used reduced graphene oxide (rGO), smaller and thinner than the GNPs used in this study, and point to a noticeable increase in the fracture toughness and electrical conductivity of the ceramic matrix [18,19]. An electrical conductivity of ~104 S/m was obtained for SPSed 3YTZP composites with a 4.1 vol% rGO (7-8 nm thick) by Shin & Hong [18], while the percolation threshold was estimated at 2.5 vol% rGO.…”

Section: Ceramics Internat Ionalmentioning

confidence: 98%

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: Ceramics Internat Ionalmentioning

confidence: 98%

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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“…Kwon et al used high-frequency induction-heated sintering (HFIHS) to introduce graphene as a reinforcing agent in ZrO 2 ceramics. 87 The electrical conductivity of the ceramic composites increased with increasing amount of graphene as depicted in Fig. 12; and was 1000 times higher (3 wt%) in comparison to monolithic ZrO 2 .…”

Section: Electrical Properties and Percolation Thresholdmentioning

confidence: 94%

“…In 2015, Kwon et al demonstrated that ZrO 2 -graphene composites can also be densified via high-frequency induction heat sintering (HFIHS). 87 HFIHS focusses on sintering ceramics over very short sintering times (,2 min) through the simultaneous application of induced current and high pressure (Fig. 7).…”

Section: A Spark Plasma Sintering (Sps)mentioning

confidence: 99%

Recent progress in graphene based ceramic composites: a review

2016

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“…The literature on mechanical properties of ceramic composites with GBN reports a decrease in hardness and Young's modulus with increasing GBN content [9][10][11][12][13][14][15], while the results on fracture toughness and flexural strength vary in a large range. Many authors estimated fracture toughness of ceramic GBN composites from direct crack measurement (DCM) after indentation tests (a quite simple and easy technique), but this method fails to provide reliable results with carbonaceous phases such as carbon nanotubes or graphite as fillers [16].…”

Section: Introductionmentioning

confidence: 99%

Flexure Strength and Fracture Propagation in Zirconia Ceramic Composites with Exfoliated Graphene Nanoplatelets

et al. 2020

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In this work, the flexure strength and fracture propagation mechanisms in yttria tetragonal zirconia (3YTZP) dense composites with 1 and 5 vol.% exfoliated graphene nanoplatelets (e-GNP) were assessed. The composite powders were processed by dry planetary ball milling to exfoliate the as-received GNP, and then densified by spark plasma sintering (SPS). The hardness and Young’s modulus were measured by Vickers indentation and the impulse-echo technique, respectively. Flexural strength and modulus were estimated by four-point bending tests. Finally, cracks originated by Vickers indentations were analyzed by scanning electron microscopy (SEM). The Raman spectra and SEM observations showed a reduction in the number of graphene layers and most remarkably in the lateral size of the e-GNP, achieving a very homogeneous distribution in the ceramic matrix. The hardness, elastic modulus, and flexural strength of the 3YTZP matrix did not vary significantly with the addition of 1 vol.% e-GNP, but they decreased when the content increased to 5 vol.%. The addition of e-GNP to 3YTZP increased its reliability under bending, and the small lateral size of the e-GNP produced isotropic fracture propagation. However, the energy dissipation mechanisms conventionally attributed to the larger GNP such as fracture deflection or blocking were limited.

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Enhanced properties of nanostructured ZrO2–graphene composites rapidly sintered via high-frequency induction heating

Cited by 65 publications

References 29 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

Recent progress in graphene based ceramic composites: a review

Flexure Strength and Fracture Propagation in Zirconia Ceramic Composites with Exfoliated Graphene Nanoplatelets

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