The effect of graphene nanoplatelet thickness on the fracture toughness of Si3N4 composites

Orsolya Tapasztó, Viktor Puchy, Z. Horváth, Zsolt Fogarassy, Eszter Bódis, Zoltán Károly, Katalin Balázsi, Jan Dusza, Levente Tapasztó

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Si3N4 composites with 3 and 5 wt% of graphene nanoplatelet (GNP) additions were prepared by spark plasma sintering. We used both commercially available GNPs and thinner few-layer graphene nanoplatelets (FL-GNPs) prepared by further exfoliation through ball milling with melamine addition. We found that by employing thinner FL-GNPs as filler material a 100% increase in the fracture toughness of Si3N4/3 wt% FL-GNP composites (10.5 ± 0.2 MPa m1/2) can be achieved as compared to the monolithic Si3N4 samples (5.1 ± 0.3 MPa m1/2), and 60% increase compared to conventional Si3N4/3 wt% GNP composites (6.6 ± 0.4 MPa m1/2). For 5 wt% filler content the increase of the fracture toughness was near 50% for both GNP and FL-GNP fillers. The hardness of the composites decreased with increasing GNP content. However, composites reinforced with 5 wt% of FL-GNPs displayed 30% higher Vickers hardness (12.8 ± 0.2 GPa) than their counterparts comprising conventional GNP fillers (9.8 ± 0.2 GPa). We attribute the enhanced mechanical properties obtained with thinner FL-GNPs to their higher aspect ratio leading to a more homogeneous dispersion, higher interface area, as well as smaller pores in the ceramic matrix.

Original languageEnglish
JournalCeramics International
DOIs
Publication statusAccepted/In press - Jan 1 2019

Fingerprint

Graphite
Graphene
Fracture toughness
Composite materials
Fillers
silicon nitride
Melamine
Spark plasma sintering
Vickers hardness
Ball milling
Aspect ratio
Hardness

Keywords

  • Composites
  • Graphene nanoplatelets
  • Silicon nitride
  • Toughening

ASJC Scopus subject areas

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

Cite this

The effect of graphene nanoplatelet thickness on the fracture toughness of Si3N4 composites. / Tapasztó, Orsolya; Puchy, Viktor; Horváth, Z.; Fogarassy, Zsolt; Bódis, Eszter; Károly, Zoltán; Balázsi, Katalin; Dusza, Jan; Tapasztó, Levente.

In: Ceramics International, 01.01.2019.

Research output: Contribution to journalArticle

Tapasztó, Orsolya ; Puchy, Viktor ; Horváth, Z. ; Fogarassy, Zsolt ; Bódis, Eszter ; Károly, Zoltán ; Balázsi, Katalin ; Dusza, Jan ; Tapasztó, Levente. / The effect of graphene nanoplatelet thickness on the fracture toughness of Si3N4 composites. In: Ceramics International. 2019.
@article{37b11c5c1d094dc7ad194c2a65b5b36a,
title = "The effect of graphene nanoplatelet thickness on the fracture toughness of Si3N4 composites",
abstract = "Si3N4 composites with 3 and 5 wt{\%} of graphene nanoplatelet (GNP) additions were prepared by spark plasma sintering. We used both commercially available GNPs and thinner few-layer graphene nanoplatelets (FL-GNPs) prepared by further exfoliation through ball milling with melamine addition. We found that by employing thinner FL-GNPs as filler material a 100{\%} increase in the fracture toughness of Si3N4/3 wt{\%} FL-GNP composites (10.5 ± 0.2 MPa m1/2) can be achieved as compared to the monolithic Si3N4 samples (5.1 ± 0.3 MPa m1/2), and 60{\%} increase compared to conventional Si3N4/3 wt{\%} GNP composites (6.6 ± 0.4 MPa m1/2). For 5 wt{\%} filler content the increase of the fracture toughness was near 50{\%} for both GNP and FL-GNP fillers. The hardness of the composites decreased with increasing GNP content. However, composites reinforced with 5 wt{\%} of FL-GNPs displayed 30{\%} higher Vickers hardness (12.8 ± 0.2 GPa) than their counterparts comprising conventional GNP fillers (9.8 ± 0.2 GPa). We attribute the enhanced mechanical properties obtained with thinner FL-GNPs to their higher aspect ratio leading to a more homogeneous dispersion, higher interface area, as well as smaller pores in the ceramic matrix.",
keywords = "Composites, Graphene nanoplatelets, Silicon nitride, Toughening",
author = "Orsolya Tapaszt{\'o} and Viktor Puchy and Z. Horv{\'a}th and Zsolt Fogarassy and Eszter B{\'o}dis and Zolt{\'a}n K{\'a}roly and Katalin Bal{\'a}zsi and Jan Dusza and Levente Tapaszt{\'o}",
year = "2019",
month = "1",
day = "1",
doi = "10.1016/j.ceramint.2018.12.180",
language = "English",
journal = "Ceramics International",
issn = "0272-8842",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - The effect of graphene nanoplatelet thickness on the fracture toughness of Si3N4 composites

AU - Tapasztó, Orsolya

AU - Puchy, Viktor

AU - Horváth, Z.

AU - Fogarassy, Zsolt

AU - Bódis, Eszter

AU - Károly, Zoltán

AU - Balázsi, Katalin

AU - Dusza, Jan

AU - Tapasztó, Levente

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Si3N4 composites with 3 and 5 wt% of graphene nanoplatelet (GNP) additions were prepared by spark plasma sintering. We used both commercially available GNPs and thinner few-layer graphene nanoplatelets (FL-GNPs) prepared by further exfoliation through ball milling with melamine addition. We found that by employing thinner FL-GNPs as filler material a 100% increase in the fracture toughness of Si3N4/3 wt% FL-GNP composites (10.5 ± 0.2 MPa m1/2) can be achieved as compared to the monolithic Si3N4 samples (5.1 ± 0.3 MPa m1/2), and 60% increase compared to conventional Si3N4/3 wt% GNP composites (6.6 ± 0.4 MPa m1/2). For 5 wt% filler content the increase of the fracture toughness was near 50% for both GNP and FL-GNP fillers. The hardness of the composites decreased with increasing GNP content. However, composites reinforced with 5 wt% of FL-GNPs displayed 30% higher Vickers hardness (12.8 ± 0.2 GPa) than their counterparts comprising conventional GNP fillers (9.8 ± 0.2 GPa). We attribute the enhanced mechanical properties obtained with thinner FL-GNPs to their higher aspect ratio leading to a more homogeneous dispersion, higher interface area, as well as smaller pores in the ceramic matrix.

AB - Si3N4 composites with 3 and 5 wt% of graphene nanoplatelet (GNP) additions were prepared by spark plasma sintering. We used both commercially available GNPs and thinner few-layer graphene nanoplatelets (FL-GNPs) prepared by further exfoliation through ball milling with melamine addition. We found that by employing thinner FL-GNPs as filler material a 100% increase in the fracture toughness of Si3N4/3 wt% FL-GNP composites (10.5 ± 0.2 MPa m1/2) can be achieved as compared to the monolithic Si3N4 samples (5.1 ± 0.3 MPa m1/2), and 60% increase compared to conventional Si3N4/3 wt% GNP composites (6.6 ± 0.4 MPa m1/2). For 5 wt% filler content the increase of the fracture toughness was near 50% for both GNP and FL-GNP fillers. The hardness of the composites decreased with increasing GNP content. However, composites reinforced with 5 wt% of FL-GNPs displayed 30% higher Vickers hardness (12.8 ± 0.2 GPa) than their counterparts comprising conventional GNP fillers (9.8 ± 0.2 GPa). We attribute the enhanced mechanical properties obtained with thinner FL-GNPs to their higher aspect ratio leading to a more homogeneous dispersion, higher interface area, as well as smaller pores in the ceramic matrix.

KW - Composites

KW - Graphene nanoplatelets

KW - Silicon nitride

KW - Toughening

UR - http://www.scopus.com/inward/record.url?scp=85059445970&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85059445970&partnerID=8YFLogxK

U2 - 10.1016/j.ceramint.2018.12.180

DO - 10.1016/j.ceramint.2018.12.180

M3 - Article

JO - Ceramics International

JF - Ceramics International

SN - 0272-8842

ER -