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High-temperature creep of carbon nanofiber-reinforced and graphene oxide-reinforced alumina composites sintered by spark plasma sintering
Affiliation:1. Departamento de Física de la Materia Condensada, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, Spain;2. Instituto de Ciencia de Materiales de Sevilla, CSIC-US, Avenida Américo Vespucio 49, 41092 Sevilla, Spain;3. Instituto de Cerámica y Vidrio (ICV-CSIC), E-28049 Madrid, Spain;1. Department of Materials Science and Engineering, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran;2. Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran;1. Departamento de Física de la Materia Condensada, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, Spain;2. Facultad de Ingeniería, Universidad de Talca, Campus Los Niches, Camino a los Niches km 1, Curicó, Chile;1. Department of Materials and Metallurgical Engineering, Iran University of Science and Technology, Tehran, Iran;2. International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), Tsukuba, Japan;3. Institute of Physics of Complex Matter, Swiss Federal Institute of Technology Lausanne (EPFL), 1015 Lausanne, Switzerland;4. Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, Stockholm SE-106 91, Sweden;1. Department of Molecular Chemistry & Biochemistry, Faculty of Science & Engineering, Doshisha University, Kyo-tanabe, Kyoto 610-0321, Japan;2. National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
Abstract:Alumina (Al2O3) ceramic composites reinforced with either graphene oxide (GO) or carbon nanofibers (CNFs) were prepared using Spark Plasma Sintering. The effects of GO and CNFs on the microstructure and in consequence on their mechanical properties were investigated. The microstructure of the sintered materials have been characterized quantitatively prior to and after the creep experiments in order to discover the deformation mechanism. Graphene-oxide reinforced alumina composites were found to be more creep resistant than carbon nanofibers-reinforced alumina ones or monolithic alumina with the same grain size distribution. In all the cases, grain boundary sliding was identified as the deformation mechanism.
Keywords:Graphene-oxide  Carbon nanofiber  Alumina composites  Creep resistance
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