FRACTURE MECHANISM IN Si3N4 – GRAPHENE PLATELETS COMPOSITES

Kvetková, Lenka and Duszová, Annamária and Kašiarová, Monika and Dorčáková, Františka and Dusza, Ján and Balázsi, Csaba (2013) FRACTURE MECHANISM IN Si3N4 – GRAPHENE PLATELETS COMPOSITES. ACTA METALLURGICA SLOVACA - CONFERENCE, 3. pp. 213-218. ISSN 1338-1660

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Abstract

Silicon nitride + 1 wt% graphene platelet composites were prepared using various graphene platelets (GPLs) as a filler. Two different sintering routes were applied which resulted in different microstructure: hot isostatic pressing (1700°C/3h/20 MPa) and gas pressure sintering (1700°C/0h/2 MPa). The influence of the GPLs addition and of processing routes on the fracture toughness and fracture mechanism of Si3N4+GPLs was investigated. The main toughening mechanisms, which originated from the presence of the graphene platelets are crack deflection, crack branching and crack bridging. These mechanisms are responsible for the increase of fracture toughness which is higher than that of monolithic Si3N4. The highest value of fracture toughness was obtained in the case of the composite processed by hot isostatic pressing using the GPLs with lowest dimension.

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