Sintering behavior of spark plasma sintered alumina with graphene nanoplatelet reinforcement |
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| Affiliation: | 1. Department of Chemical Engineering and Materials Science, University of California Davis, Davis, CA, 95616, USA;2. School of Materials Science and Engineering, Yeungnam University, Gyeongbuk 712-749, Republic of Korea;1. Key Laboratory for liquid–solid Structural Evolution & Processing of Materials of Ministry of Education, Shandong University, Jinan 250061, PR China;2. Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Jinan 250061, PR China;1. Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA;2. Department of Industrial Engineering, Texas Tech University, Lubbock, TX 79409, USA;1. Centro de Investigación en Nanomateriales y Nanotecnología (CINN). [Principado de Asturias - Consejo Superior de Investigaciones Científicas (CSIC) – Universidad de Oviedo (UO)], Avenida de la Vega, 4–6, 33940, El Entrego (Asturias), Spain;2. Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), C/ Sor Juana Inés de la Cruz, 3, 28049 Madrid, Spain;3. Graphenea S.A., Tolosa Hiribidea 76, E-20018 Donostia-San Sebastián, Spain;4. ITMA Materials Technology, Parque Tecnológico de Asturias, 33428 Llanera, Spain;5. Moscow State University of Technology “STANKIN”, Vadkovskij per. 1, Moscow, Moscow Oblast, Russia;1. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;2. School of Materials Science and Engineering, Yeungnam University, Gyeongsan, Republic of Korea;3. School of Mechanical Engineering, Yeungnam University, Gyeongsan, Republic of Korea;4. Department of Chemical Engineering and Materials Science, University of California Davis, USA;1. Northumbria University, Faculty of Engineering and Environment, Department of Mechanical and Construction Engineering, Newcastle upon Tyne NE1 8ST, United Kingdom;2. National Institute of Technology Karnataka, Department of Chemistry, Catalysis and Materials Laboratory, Surathkal, Srinivasanagar 575025, India;1. Institute for NanoEngineering Research, Tshwane University of Technology, Pretoria, South Africa;2. Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa |
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| Abstract: | Graphene nanoplatelet (GNP) reinforced alumina is synthesized by spark plasma sintering (SPS) using process conditions of 1100–1500 °C, 3–10 min dwell time, and 45–90 MPa in order to investigate the effects of GNP on sintering behavior. High volume fractions of GNP (5–15 vol%) are utilized in order to accentuate effects of GNPs. GNP effects on sintering behavior are assessed by evaluating microstructural evolution, grain growth kinetics, and microhardness. The addition of GNPs is found to suppress grain growth by a grain wrapping mechanism resulting in a 10% increase in activation energy when GNP content is increased beyond 5 vol %. Grain growth suppression partially mitigates a decrease in hardness due to the introduction of the soft GNP phase. Evidence of GNPs serving as a sintering aid are seen at short sintering times (3 min), while densification and grain size are observed to level off with extended sintering time (10 min). The application of higher pressures enhances densification, which enables GNPs to more effectively wrap around grains resulting in enhanced grain growth suppression. |
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| Keywords: | A. Sintering B. Nanocomposite Graphene SPS |
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