Exceptional micromachining performance of silicon carbide ceramics by adding graphene nanoplatelets |
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| Affiliation: | 1. Laboratory for Process Technology, Department of Microsystems Engineering—IMTEK, University of Freiburg, Georges-Köhler-Allee 103, 79110, Freiburg, Germany;2. Institute of Ceramics and Glass (ICV-CSIC), Kelsen 5, 28049, Madrid, Spain;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 of Materials Research, Slovak Academy of Sciences, Division of Ceramic and Non-Metallic Systems, Watsonova 47, 040 01 Ko?ice, Slovak Republic;2. Pavol Jozef ?afárik University in Ko?ice, Faculty of Science, Institute of Physics, Department of Condensed Matter Physics, Park Angelinum 9, 040 01 Ko?ice, Slovak Republic;3. AGH University of Science and Technology in Krakow, Faculty of Materials Science and Ceramics, Department of Ceramics and Refractories, al. A. Mickiewicza 30, 30-059 Krakow, Poland;4. Centre for Materials Research and Sintering Technology, Institute of Advanced Manufacturing Technology, Krakow, 30–011, Poland;5. Donát Bánki Faculty of Mechanical and Safety Engineering, Óbuda University, Népszínház utca 8, 1081 Budapest, Hungary;1. Instituto de Cerámica y Vidrio, CSIC, Campus Cantoblanco, 28049 Madrid, Spain;2. Departamento de Tecnología Mecánica, Universidad Rey Juan Carlos, Móstoles, 28933 Madrid, Spain;3. Research Center for Exotic Nanocarbons (JST), Shinshu University, Wakasato 4-17-1, Nagano 380-853, Japan;4. Department of Physics, Department of Chemistry, Department of Materials Science and Engineering, and Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA 16802, USA;1. Institute of Materials Research, Slovak Academy of Sciences, Division of Ceramic and Non-Metallic Systems, Watsonova 47, 040 01 Ko?ice, Slovak Republic;2. AGH University of Science and Technology in Krakow, Faculty of Materials Science and Ceramics, Department of Ceramics and Refractories, al. A. Mickiewicza 30, 30-059 Krakow, Poland;3. Pavol Jozef ?afárik University in Ko?ice, Faculty of Science, Institute of Physics, Department of Condensed Matter Physics,Park Angelinum 9, 040 01 Ko?ice, Slovak Republic;4. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Department of Ceramics, Dúbravská cesta 9, 845 36 Bratislava, Slovak Republic;1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China;2. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China |
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| Abstract: | The electrical discharge machining (EDM) performance of silicon carbide (SiC) ceramics containing graphene nanoplatelets (GNPs) is investigated for the first time. Under fine machining conditions, the material removal rate (MRR) dramatically increases up to 186% when 20 vol.% of GNPs are added to SiC ceramics, leading to reductions on the electrode wear rate of 132%. The EDMed nanocomposites exhibit surface roughness ≤ 0.8 μm. This outstanding EDM response of the graphene nanocomposites as compared to monolithic SiC is explained by their enhanced transport properties, establishing a direct dependence of MRR with the electrical conductivity. EDM performance of the nanocomposites also depends on the testing direction for materials with low GNPs connectivity (≤ 10 vol.%). Melting/evaporation are the main removal mechanisms, thermal spalling also operating for low thermal conducting materials. The employ of EDM on SiC/graphene nanocomposites allows machining microparts with a fine dimensional precision, opening new opportunities for SiC-based microcomponents. |
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| Keywords: | Graphene Silicon carbide Ceramic matrix composites Machining Microcomponents |
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