Toughening of silicon nitride ceramics by addition of multilayer graphene

Eszter Bódis, Ildikó Cora, P. Németh, Orsolya Tapasztó, M. Mohai, S. Tóth, Zoltán Károly, J. Szépvölgyi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Silicon nitride (Si3N4) ceramics have superior mechanical properties allowing their broad application in many technical fields. In this work, Si3N4-based composites with 1–5 wt% multilayer graphene (MLG) content were fabricated by spark plasma sintering at different temperatures and holding time in order to improve the fracture resistance of the Si3N4 ceramic. Our investigation focused on understanding the relationships between the microstructure and mechanical properties with special attention to the intergranular phases between Si3N4 matrix and MLG reinforcement. We have found that nanopores developed at the Si3N4-MLG interface due to a reaction between carbon and the oxygen available in the topmost layer of the Si3N4 particles. Interface porosity has an optimum for the toughening effect. In 1 wt% MLG/Si3N4 composites nanopores are local, but separated at the Si3N4-MLG interface, which promote the MLG pull-out mechanism imparting a significant toughening effect on the composite. Beyond the optimal 1 wt% MLG content, MLG platelets agglomerate and excessive porosity are developed at the Si3N4-MLG interfaces, leading to weaker matrix- graphene adhesion and thus lower fracture toughness.

Original languageEnglish
JournalCeramics International
DOIs
Publication statusAccepted/In press - Jan 1 2018

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Graphite
Toughening
Silicon nitride
Graphene
Multilayers
Nanopores
Fracture toughness
Composite materials
Porosity
silicon nitride
Mechanical properties
Spark plasma sintering
Platelets
Reinforcement
Carbon
Adhesion
Oxygen
Microstructure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Toughening of silicon nitride ceramics by addition of multilayer graphene. / Bódis, Eszter; Cora, Ildikó; Németh, P.; Tapasztó, Orsolya; Mohai, M.; Tóth, S.; Károly, Zoltán; Szépvölgyi, J.

In: Ceramics International, 01.01.2018.

Research output: Contribution to journalArticle

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AU - Mohai, M.

AU - Tóth, S.

AU - Károly, Zoltán

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