Production and characterization of spark plasma sintered (Ti,Nb)B2 solid solutions with graphene nanoplatelets and hexagonal boron nitride

Melis Kaplan Akarsu, Ipek Akin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

For this study, (Ti,Nb)B2 solid solutions were consolidated by spark plasma sintering. In addition, (Ti,Nb)B2 with graphene nanoplatelets (GNPs) and hexagonal boron nitride (h-BN) were produced to evaluate the potential of the new structural materials. The phase formation, microstructure, mechanical properties, oxidation resistance and room temperature reflectance, and absorbance features of (Ti,Nb)B2 were investigated. X-ray diffraction and Transmission electron microscopy observations showed that a complete solid solution phase was formed when the samples were sintered at 1850 °C for 5 min under 50 MPa. Ti0.75Nb0.25B2 exhibited a relative density of ∼98.6%, a hardness of ∼20.5 GPa, and an indentation fracture toughness of ∼3.4 MPa·m1/2. It was found that the presence of 1 vol% h-BN as an additive enhanced the hardness (∼10%) and fracture toughness (∼30%) of Ti0.75Nb0.25B2 by activating toughening mechanisms. The GNP added Ti0.75Nb0.25B2 proved to have better oxidation resistance and optical absorbance than the other materials used in the study.

Original languageEnglish
Pages (from-to)5582-5594
Number of pages13
JournalCeramics International
Volume49
Issue number4
DOIs
Publication statusPublished - 15 Feb 2023

Bibliographical note

Publisher Copyright:
© 2022 Elsevier Ltd and Techna Group S.r.l.

Keywords

  • Borides
  • GNP
  • Solid solution
  • h-BN

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