Effect of graphene nano-platelet reinforcement on the mechanical properties of hot pressed boron carbide based composite

Research output: Contribution to journalArticle

Authors

  • Rajath Alexander
  • Murthy Tammana
  • K. V. Ravikanth
  • Jyoti Prakash
  • Tarasankar Mahata
  • And 3 others
  • Srinivasa Rao Bakshi
  • Madangopal Krishnan
  • Kinshuk Dasgupta

Colleges, School and Institutes

External organisations

  • Bhabha Atomic Research Centre
  • IIT Madras

Abstract

Boron carbide (B4C) based composites with graphene nano-platelet (GNP) as reinforcement have been prepared by hot pressing. Effect of GNP addition on mechanical properties of the composite, like, hardness, fracture toughness, flexural strength was evaluated. Phase evolution was studied by X-ray diffraction (XRD) and Raman spectroscopy. 2 vol% addition of GNP improved the density of the composite, which acted as a sintering aid. Further addition of GNP resulted in formation of the interconnected networks, agglomerates and interfacial porosities. Improved fracture toughness (KIC) but decreased flexural strength was observed with addition of GNP. Maximum fracture toughness of 5.41 ± 0.55 MPa m1/2 (by indentation method) and 4.52 ± 0.15 MPa m1/2 (by single edge notch bend (SENB) method) was obtained for 10 vol% GNP-B4C composite. Hardness and elastic modulus were also improved with 2 vol% addition of GNP. The observations have been explained with suitable mechanism and model, supported by microstructural and mechanical property data.

Details

Original languageEnglish
Pages (from-to)9830-9838
Number of pages9
JournalCeramics International
Volume44
Issue number8
Early online date3 Mar 2018
Publication statusPublished - 1 Jun 2018

Keywords

  • Boron carbide, Fracture toughness, Graphene nano platelet, Hot pressing, Raman spectroscopy, XRD