Next Article in Journal
Effect of Annealing on the Structural, Magnetic and Surface Energy of CoFeBY Films on Si (100) Substrate
Previous Article in Journal
Experimental and Analytical Study on Creep Characteristics of Box Section Bamboo-Steel Composite Columns under Long-Term Loading
Article

The Possible Detriment of Oxygen in Creep of Alumina and Zirconia Ceramic Composites Reinforced with Graphene

1
Departament de Física de la Materia Condensada, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, Spain
2
Instituto de Ciencia de Materiales de Sevilla, CSIC-USE, Avenida Américo Vespucio 49, 41092 Sevilla, Spain
3
Instituto de Cerámica y Vidrio, CSIC, E-28049 Madrid, Spain
*
Author to whom correspondence should be addressed.
Materials 2021, 14(4), 984; https://doi.org/10.3390/ma14040984
Received: 8 January 2021 / Revised: 8 February 2021 / Accepted: 12 February 2021 / Published: 19 February 2021
(This article belongs to the Special Issue Mechanical Properties and Electrical Conductivity of Ceramics)
This paper is aims to give an answer to the following question: is the oxidation of graphene a critical issue for high-temperature plasticity in graphene-reinforced ceramics? To give a convincing reply, we will focus on two very different graphene-based ceramic composites: reduced graphene oxide (rGO)-reinforced alumina (α-Al2O3) and reduced graphene oxide (rGO)-reinforced yttria tetragonal zirconia (t-ZrO2). The processing of the powders has been made using a colloidal route, and after that, a spark plasma sintering process was performed in order to densify the samples. Creep tests were performed at temperatures between 1200–1250 °C in an argon atmosphere. The microstructure obtained by an SEM of the sintered and tested specimens was characterized quantitatively to elucidate the deformation mechanism. Raman spectroscopy was carried out to check the integrity of the graphene. The average grain size was in the order of 1 µm and the shape factor was 0.7 for all the studied materials. The integrity of the graphene was checked before and after the creep experiments. The careful analysis of the creep tests shows that graphene oxide or its reduced version are not efficient phases for creep resistance improvement in general, contrary to what is reported elsewhere. However, the results permit the suggestion of a creep improvement in nanocomposites at a very high temperature regime due to an enhanced reactivity of oxygen between carbon and alumina interfaces. In the case of zirconia, the results give us the conclusion that the oxidation of graphene is a highly detrimental issue regarding the improvement of high-temperature plasticity. View Full-Text
Keywords: ceramic; composite; high temperature; microstructural characterization; plasticity ceramic; composite; high temperature; microstructural characterization; plasticity
Show Figures

Figure 1

MDPI and ACS Style

Cano-Crespo, R.; Rivero-Antúnez, P.; Gómez-García, D.; Moreno, R.; Domínguez-Rodríguez, A. The Possible Detriment of Oxygen in Creep of Alumina and Zirconia Ceramic Composites Reinforced with Graphene. Materials 2021, 14, 984. https://doi.org/10.3390/ma14040984

AMA Style

Cano-Crespo R, Rivero-Antúnez P, Gómez-García D, Moreno R, Domínguez-Rodríguez A. The Possible Detriment of Oxygen in Creep of Alumina and Zirconia Ceramic Composites Reinforced with Graphene. Materials. 2021; 14(4):984. https://doi.org/10.3390/ma14040984

Chicago/Turabian Style

Cano-Crespo, Rafael, Pedro Rivero-Antúnez, Diego Gómez-García, Rodrigo Moreno, and Arturo Domínguez-Rodríguez. 2021. "The Possible Detriment of Oxygen in Creep of Alumina and Zirconia Ceramic Composites Reinforced with Graphene" Materials 14, no. 4: 984. https://doi.org/10.3390/ma14040984

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop