Comparative investigation of the properties of graphene nanoplatelet reinforced titanium diboride and niobium diboride ceramics


Akın Karadayı İ., Ocak B. C. , Akarsu M. K. , Yücel O., Şahin F., Göller G.

International Journal of Refractory Metals and Hard Materials, vol.103, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 103
  • Publication Date: 2022
  • Doi Number: 10.1016/j.ijrmhm.2021.105761
  • Journal Name: International Journal of Refractory Metals and Hard Materials
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Titanium diboride, Niobium diboride, Graphene, Oxidation, Spark plasma sintering, MECHANICAL-PROPERTIES, OXIDATION BEHAVIOR, PARTICLE-SIZE, COMPOSITES, TIB2, MICROSTRUCTURE, DENSIFICATION, CARBIDE, ZIRCONIUM, BORIDE
  • Istanbul Technical University Affiliated: Yes

Abstract

© 2021In this study, the effect of GNP concentration on the mechanical properties of spark plasma sintered TiB2 and NbB2 ceramics was investigated. GNP reinforced TiB2 and NbB2 specimens were aimed to produce with nearly full densification. Herein, SEM investigations, Raman analysis, and oxidation behavior of the samples were reported. GNP addition into the TiB2 and NbB2 matrices showed a different effect on various properties of the composites. GNP loading tends to enhance densification by removing native oxides of both TiB2 and NbB2 matrices. GNPs were more effective in the oxygen removal mechanism for TiB2 composites than NbB2. The highest relative density was obtained for TiB2-GNP and NbB2-GNP composites as 98.6% with 7 vol% and 5 vol% GNP additions, respectively. The Vickers microhardness decreased with increasing GNPs loading for both matrices. NbB2-GNP composites possessed higher fracture toughness and better oxidation resistance than TiB2-GNP composites.