The Possible Detriment of Oxygen in Creep of Alumina and Zirconia Ceramic Composites Reinforced with Graphene
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 (rG...
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| author | Rafael Cano-Crespo Pedro Rivero-Antúnez Diego Gómez-García Rodrigo Moreno Arturo Domínguez-Rodríguez |
| author_facet | Rafael Cano-Crespo Pedro Rivero-Antúnez Diego Gómez-García Rodrigo Moreno Arturo Domínguez-Rodríguez |
| author_sort | Rafael Cano-Crespo |
| collection | DOAJ |
| description | 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-Al<sub>2</sub>O<sub>3</sub>) and reduced graphene oxide (rGO)-reinforced yttria tetragonal zirconia (t-ZrO<sub>2</sub>). 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. |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T00:42:49Z |
| publishDate | 2021-02-01 |
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| spelling | doaj.art-5596eb81d2994a1ba18883eafde9be332023-12-11T17:43:30ZengMDPI AGMaterials1996-19442021-02-0114498410.3390/ma14040984The Possible Detriment of Oxygen in Creep of Alumina and Zirconia Ceramic Composites Reinforced with GrapheneRafael Cano-Crespo0Pedro Rivero-Antúnez1Diego Gómez-García2Rodrigo Moreno3Arturo Domínguez-Rodríguez4Departament de Física de la Materia Condensada, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, SpainDepartament de Física de la Materia Condensada, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, SpainDepartament de Física de la Materia Condensada, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, SpainInstituto de Cerámica y Vidrio, CSIC, E-28049 Madrid, SpainDepartament de Física de la Materia Condensada, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, SpainThis 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-Al<sub>2</sub>O<sub>3</sub>) and reduced graphene oxide (rGO)-reinforced yttria tetragonal zirconia (t-ZrO<sub>2</sub>). 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.https://www.mdpi.com/1996-1944/14/4/984ceramiccompositehigh temperaturemicrostructural characterizationplasticity |
| spellingShingle | Rafael Cano-Crespo Pedro Rivero-Antúnez Diego Gómez-García Rodrigo Moreno Arturo Domínguez-Rodríguez The Possible Detriment of Oxygen in Creep of Alumina and Zirconia Ceramic Composites Reinforced with Graphene Materials ceramic composite high temperature microstructural characterization plasticity |
| title | The Possible Detriment of Oxygen in Creep of Alumina and Zirconia Ceramic Composites Reinforced with Graphene |
| title_full | The Possible Detriment of Oxygen in Creep of Alumina and Zirconia Ceramic Composites Reinforced with Graphene |
| title_fullStr | The Possible Detriment of Oxygen in Creep of Alumina and Zirconia Ceramic Composites Reinforced with Graphene |
| title_full_unstemmed | The Possible Detriment of Oxygen in Creep of Alumina and Zirconia Ceramic Composites Reinforced with Graphene |
| title_short | The Possible Detriment of Oxygen in Creep of Alumina and Zirconia Ceramic Composites Reinforced with Graphene |
| title_sort | possible detriment of oxygen in creep of alumina and zirconia ceramic composites reinforced with graphene |
| topic | ceramic composite high temperature microstructural characterization plasticity |
| url | https://www.mdpi.com/1996-1944/14/4/984 |
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