Artículo
Microstructure, interfaces and properties of 3YTZP ceramic composites with 10 and 20 vol% different graphene-based nanostructures as fillers
Autor/es | Muñoz Ferreiro, Carmen
Morales Rodríguez, Ana Rojas Ruiz, Teresa Cristina Jiménez Piqué, Emilio López Pernía, Cristina Poyato Galán, Rosalía Gallardo López, Ángela María |
Departamento | Universidad de Sevilla. Departamento de Física de la Materia Condensada |
Fecha de publicación | 2019 |
Fecha de depósito | 2023-02-07 |
Publicado en |
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Premios | Premio Mensual Publicación Científica Destacada de la US. Facultad de Física |
Resumen | 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 ... 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∼15–30 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 graphene-based 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 GBNs 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. |
Agencias financiadoras | Ministerio de Economía y Competitividad (MINECO). España |
Identificador del proyecto | MAT2015-67889-P |
Cita | Muñoz Ferreiro, C., Morales Rodríguez, A., Rojas Ruiz, T.C., Jiménez Piqué, E., López Pernía, C., Poyato Galán, R. y Gallardo López, Á.M. (2019). Microstructure, interfaces and properties of 3YTZP ceramic composites with 10 and 20 vol% different graphene-based nanostructures as fillers. Journal of Alloys and Compounds, 777, 213-224. https://doi.org/10.1016/j.jallcom.2018.10.336. |
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