Microstructure and fracture toughness of Si3N4 + graphene platelet composites |
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| Authors: | Ján Dusza Jerzy Morgiel Annamária Duszová Lenka Kvetková Martin Nosko Péter Kun Csaba Balázsi |
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| Affiliation: | 1. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04353 Ko?ice, Slovak Republic;2. Institute of Metallurgy and Materials Science of Polish Academy of Sciences, Reymonta 25, 30 059 Krakow, Poland;3. Institute of Materials & Machine Mechanics SAS, Racianska 75, 831 02 Bratislava, Slovak Republic;4. Research Institute for Technical Physics and Materials Science, Ceramics and Nanocomposites Department, Budapest 49, H-1525, Hungary;1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, People?s Republic of China;2. Department of Orthopedics, Shanghai Jiao Tong University Affiliated Sixth People?s Hospital, 600 Yishan Road, Shanghai 200233, People?s Republic of China |
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| Abstract: | Silicon nitride + 1 wt% graphene platelet composites were prepared using various graphene platelets (GPLs) as filler. The influence of the addition of GPLs on the microstructure development and on the fracture toughness of Si3N4 + GPLs composites was investigated. The GPLs with thickness from 5 nm to 50 nm are relatively homogeneously distributed in the matrix of all composites, however overlapping/bundle formation of GPLs was found, containing 2–4 platelets as well. The single GPLs and overlapped GPLs are located at the boundaries of Si3N4, and hinder the grain growth and change the shape of the grains. The fracture toughness was significantly higher for all composites in comparison to the monolithic Si3N4 with the highest value of 9.9 MPa m0.5 for the composite containing the GPLs with smallest dimension. The main toughening mechanisms originated from the presence of graphene platelets, and responsible for the increase in the fracture toughness values are crack deflection, crack branching and crack bridging. |
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