Effect of homogenization treatment on the fracture behaviour of silicon nitride/graphene nanoplatelets composites |
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| Affiliation: | 1. Slovak Academy of Sciences, Institute of Inorganic Chemistry, 845 36 Bratislava, Slovakia;2. Vitrum Laugaricio—Joint Glass Centre of the IIC SAS, TnU AD, FChPT STU and RONA, j.s.c., Trenčín, Slovakia;3. Slovak Academy of Sciences, Institute of Materials Research, 040 01 Košice, Slovakia;1. National Technical University of Ukraine “Kiev Polytechnic University”, 35 Polytechnichna str., Kiev 03056, Ukraine;2. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 3 Krzhyzhanovsky str., Kiev 03142, Ukraine;1. Ingram School of Engineering and Materials Science, Engineering and Commercialization Program, Texas State University, San Marcos, 78666 TX, USA;2. Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;3. Texas State University, Department of Chemistry and Biochemistry, 601 University Drive, San Marcos, 78666 TX, USA;4. Physics Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia |
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| Abstract: | Si3N4 based composites with 7 wt.% of graphene nanoplatelets (GNPs) were prepared using different homogenization methods. Si3N4/GNPs powder mixtures were dispersed in isopropanol and homogenized by attritor milling, ball milling or planetary ball milling. The ball milling technique was also used for the homogenization of Si3N4/GNPs mixture in dry state. Fractography analysis was carried out in order to assess the individual homogenization treatment. Depending on the homogenization methods, the size of the processing flaws varied from 20 μm up to 400 μm. The agglomeration of the GNPs and the residual porosity were found as the most frequently observed types of the critical flaws. The planetary ball milling with previous ultrasonication of GNPs in isopropanol was found to be the most promising homogenization technique, resulting in the composites with the highest bending strength (average value is 740 MPa) and the lowest average size of the processing flaws (around 20 μm). |
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| Keywords: | Silicon nitride Graphene nanoplatelets Homogenization Fractography Bending strength |
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