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Article

Critical Influence of the Processing Route on the Mechanical Properties of Zirconia Composites with Graphene Nanoplatelets

1
Departamento de Física de la Materia Condensada, ICMS, CSIC-Universidad de Sevilla, Avda. Reina Mercedes s/n, 41012 Sevilla, Spain
2
Barcelona Research Center in Multiscale Science and Engineering, Universidad Politécnica de Cataluña, Avda. Eduard Maristany 10-14, 08019 Barcelona, Spain
3
Departament of Materials Science and Engineering, Universidad Politécnica de Cataluña, Avda. Eduard Maristany 10-14, 08019 Barcelona, Spain
4
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.
Materials 2021, 14(1), 108; https://doi.org/10.3390/ma14010108
Received: 4 December 2020 / Revised: 21 December 2020 / Accepted: 23 December 2020 / Published: 29 December 2020
(This article belongs to the Special Issue Carbon Compounds-Reinforced Ceramics)
Graphene-based nanostructures, used as potential reinforcement in ceramic composites, have a great tendency to agglomerate. This requires the use of homogenization techniques during the powder processing, posing the need to evaluate how these techniques affect the microstructure and the mechanical properties of the resulting composites. The influence of the processing route on the properties of 3YTZP (3 mol % yttria tetragonal zirconia polycrystals) ceramic composites with 10 vol % cost-effective GNP (graphene nanoplatelets) has been addressed. Four different powder processing routines combining ultrasonic powder agitation (UA) and planetary ball milling (PBM) in wet and dry media have been used and all the composites were densified by spark plasma sintering (SPS). The mechanical properties at room temperature in the macroscale have been assessed by Vickers indentations, four-point bending tests and the impulse-echo technique, while instrumented indentation was used to measure the hardness and Young’s modulus at the nanoscale. The application of dry-PBM enhances greatly the mechanical and electrical isotropy of the composites, slightly increases the hardness and lowers the elastic modulus, independently of the application of UA. The combination of UA and dry-PBM enhances the flexure strength by 50%, which is desirable for structural applications. View Full-Text
Keywords: yttria tetragonal zirconia polycrystals (YTZP); graphene nanoplatelets (GNP); planetary ball milling (PBM); spark plasma sintering (SPS); instrumented hardness; elastic modulus; flexure strength yttria tetragonal zirconia polycrystals (YTZP); graphene nanoplatelets (GNP); planetary ball milling (PBM); spark plasma sintering (SPS); instrumented hardness; elastic modulus; flexure strength
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MDPI and ACS Style

Gallardo-López, Á.; Muñoz-Ferreiro, C.; López-Pernía, C.; Jiménez-Piqué, E.; Gutiérrez-Mora, F.; Morales-Rodríguez, A.; Poyato, R. Critical Influence of the Processing Route on the Mechanical Properties of Zirconia Composites with Graphene Nanoplatelets. Materials 2021, 14, 108. https://doi.org/10.3390/ma14010108

AMA Style

Gallardo-López Á, Muñoz-Ferreiro C, López-Pernía C, Jiménez-Piqué E, Gutiérrez-Mora F, Morales-Rodríguez A, Poyato R. Critical Influence of the Processing Route on the Mechanical Properties of Zirconia Composites with Graphene Nanoplatelets. Materials. 2021; 14(1):108. https://doi.org/10.3390/ma14010108

Chicago/Turabian Style

Gallardo-López, Ángela, Carmen Muñoz-Ferreiro, Cristina López-Pernía, Emilio Jiménez-Piqué, Felipe Gutiérrez-Mora, Ana Morales-Rodríguez, and Rosalía Poyato. 2021. "Critical Influence of the Processing Route on the Mechanical Properties of Zirconia Composites with Graphene Nanoplatelets" Materials 14, no. 1: 108. https://doi.org/10.3390/ma14010108

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