Effect of Multiwalled Carbon Nanotubes on Improvement of Fracture Toughness of Spark-Plasma-Sintered Yttria-Stabilized Zirconia Nanocomposites

T. Arunkumar, G. Anand, Ram Subbiah, R. Karthikeyan, Jaya Jeevahan

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

Highly dense yttria-stabilized zirconia (YSZ) nano-ceramics reinforced with TC-CVD-synthesized multiwall carbon nanotubes (MWCNTs) were fabricated using spark plasma sintering at a temperature of 1350°C, the heating rate of 100 °C/min and pressure of 50MPa with a dwell time of 10 minutes. The identical parameters were utilized for fabricating composites with a varying weight ratio of YSZ and MWNCTs. The samples were characterized for their phase transformation, microstructure and elemental composition using x-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The physical and mechanical properties such as density, porosity, hardness, fracture toughness and wear were also investigated. The increase in the MWCNTs concentration has resulted in the deterioration of the hardness due to CNT agglomerations. The wear resistance of the composites revealed MWNCTs enhanced wear resistance of YSZ nanocomposite by undergoing MWNCTs pull-out and crack branching mechanisms. Further indentation method and single-beam V-notch beam (SEVNB) methods were utilized to study the effect of MWCNTs on the fracture toughness of the nanocomposites. The fracture toughness of YC1 (6.58 ± 0.3 MPa m1/2) was 21% higher than the YSZ (5.21 ± 0.2 MPa m1/2) due to the toughening mechanisms attributable to crack deflection, branching and bridging of MWCNTs.

Original languageEnglish
Pages (from-to)3925-3933
Number of pages9
JournalJournal of Materials Engineering and Performance
Volume30
Issue number6
Early online date22 Feb 2021
DOIs
Publication statusPublished - Jun 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2021, The Author(s).

Keywords

  • energy dissipating mechanisms
  • fracture toughness
  • multiwalled carbon nanotubes (MWCNTs)
  • spark plasma sintering (SPS)
  • yttria-stabilized zirconia (YSZ)

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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