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Article

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

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Departamento de Física de la Materia Condensada, ICMS, CSIC-Universidad de Sevilla, Avda. Reina Mercedes s/n, 41012 Sevilla, Spain
2
Instituto de Ciencia de Materiales de Sevilla, ICMS, CSIC-Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain
*
Author to whom correspondence should be addressed.
Ceramics 2020, 3(1), 78-91; https://doi.org/10.3390/ceramics3010009
Received: 17 December 2019 / Revised: 19 February 2020 / Accepted: 28 February 2020 / Published: 5 March 2020
(This article belongs to the Special Issue Advances in Structural Ceramic Materials)
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. View Full-Text
Keywords: 3YTZP; graphene nanoplatelets (GNP); ceramic composites; planetary ball milling; SPS; Raman spectroscopy; flexural strength; four-point bending; crack propagation; Vickers indentations 3YTZP; graphene nanoplatelets (GNP); ceramic composites; planetary ball milling; SPS; Raman spectroscopy; flexural strength; four-point bending; crack propagation; Vickers indentations
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MDPI and ACS Style

Gallardo-López, Á.; Castillo-Seoane, J.; Muñoz-Ferreiro, C.; López-Pernía, C.; Morales-Rodríguez, A.; Poyato, R. Flexure Strength and Fracture Propagation in Zirconia Ceramic Composites with Exfoliated Graphene Nanoplatelets. Ceramics 2020, 3, 78-91. https://doi.org/10.3390/ceramics3010009

AMA Style

Gallardo-López Á, Castillo-Seoane J, Muñoz-Ferreiro C, López-Pernía C, Morales-Rodríguez A, Poyato R. Flexure Strength and Fracture Propagation in Zirconia Ceramic Composites with Exfoliated Graphene Nanoplatelets. Ceramics. 2020; 3(1):78-91. https://doi.org/10.3390/ceramics3010009

Chicago/Turabian Style

Gallardo-López, Ángela, Javier Castillo-Seoane, Carmen Muñoz-Ferreiro, Cristina López-Pernía, Ana Morales-Rodríguez, and Rosalía Poyato. 2020. "Flexure Strength and Fracture Propagation in Zirconia Ceramic Composites with Exfoliated Graphene Nanoplatelets" Ceramics 3, no. 1: 78-91. https://doi.org/10.3390/ceramics3010009

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