KAŠIAROVÁ Monika Institute of Materials Research SAS

Effect of the Sintering Additives on the Properties of Silicon Nitride-Graphene Nanoplatelets Composites

Co-authors MICHÁLKOVÁ Monika, DUSZA Ján, ŠAJGALÍK Pavol

Silicon nitride based composites with 1 wt. % of graphene nanoplatelets (GNPs) were prepared using five different combination of the sintering additives. Relation between the sintering additives, evolution of the microstructure and some of the mechanical properties of Si3N4–GNPs composites has been studied. Observed microstructural changes depend on the viscosity of used sintering additives at sintering temperature. The incorporation of carbon-nanostructures (GNPs) into a ceramic matrix inhibits the sintering driving force leading to a lower grain size at higher temperatures and to a suppression of α to β transformation of silicon nitride at lower temperatures. Basic mechanical properties such as hardness, Young’s modulus, fracture toughness and flexural strength of silicon nitride with the addition of 1wt.% of graphene nanoplatelets have been determined and compared to the monolithic silicon nitride. ACKNOWLEDGEMENTS: The authors gratefully acknowledge the financial support of project APVV 0161-11.