Indentation Fracture Toughness of Al2O3 + GPLs and Si3N4 + GPLs Systems

Richard Sedlák; Alexandra Kovalčíková; Monika Tatarková; Pawel Rutkowski; Ján Dusza

doi:10.4028/www.scientific.net/DDF.368.166

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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 368Indentation Fracture Toughness of Al2O3 + GPLs and...

Indentation Fracture Toughness of Al₂O₃ + GPLs and Si₃N₄ + GPLs Systems

Abstract:

The influence of 1 wt.% and 2 wt.% of graphene platelets (GPLs) addition on indentation fracture toughness (IF) of aluminium oxide (Al₂O₃) and silicon nitride (Si₃N₄) based composites has been investigated and compared to the monoliths. Ceramic composites reinforced with GPLs were prepared using hot-press processing technology. Microstructures were observed at fracture surfaces by scanning electron microscopy (SEM). Crack type identification was performed by gradually polishing of the indentation surface and mechanical properties of both systems were measured. Indentation fracture toughness was calculated by various methods and R-curves were prepared. The main activated toughening mechanisms, responsible for the increased fracture toughness are crack deflection, crack branching and crack bridging in the forms of graphene sheet pull-out or graphene necking.

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Periodical:

Defect and Diffusion Forum (Volume 368)

Pages:

166-169

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.368.166

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Online since:

July 2016

Authors:

Richard Sedlák*, Alexandra Kovalčíková, Monika Tatarková, Pawel Rutkowski, Ján Dusza

Keywords:

Aluminium Oxide, Graphene Platelets, Indentation Fracture Toughness, Silicon Nitride

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