Nano-diamond reinforced ZrB2-SiC composites

Fattahi M., Azizian-Kalandaragh Y., Delbari S. A., Namini A. S., Ahmadi Z., Asl M. S.

CERAMICS INTERNATIONAL, vol.46, no.8, pp.10172-10179, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 46 Issue: 8
  • Publication Date: 2020
  • Doi Number: 10.1016/j.ceramint.2020.01.008
  • Journal Name: CERAMICS INTERNATIONAL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.10172-10179
  • Keywords: ZrB2, SiC, Nano-diamond, SPS, HOT-PRESSING PARAMETERS, MECHANICAL-PROPERTIES, HEAT-TRANSFER, FRACTOGRAPHICAL CHARACTERIZATION, THERMAL-STRESS, PLASMA, CERAMICS, DENSIFICATION, TEMPERATURE, ZIRCONIUM
  • Gazi University Affiliated: No

Abstract

The effect of adding various amounts of nano-diamond additive (0, 1, 2, and 3 wt%) on the densification behavior and mechanical properties of ZrB2-25 vol% SiC samples were investigated in this research. All samples were spark plasma sintered at 1900 degrees C under 40 MPa external pressure for 7 min. Relative density (RD) values higher than 99.9% were obtained for the samples with 0, 1, and 2 wt% nano-diamond, while adding 3 wt% diamond dropped the RD by similar to 1.2%. The XRD and microstructural evaluations revealed the formation of some in-situ phases, namely ZrC and B4C. The highest Vickers hardness (24.7 GPa) and fracture toughness (5.8 MPa m(1/2)) were achieved for the samples doped with 2 and 3 wt% nano-diamond, respectively. Ultimately, the SEM micrographs indicated the role of different toughening mechanisms on obtaining such a high value of fracture toughness.