Spark plasma sintering of TiN-TiB2-hBN composites and their properties

Mettaya Kitiwan, Akihiko Ito, Takashi Goto

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

TiN-TiB2-hBN composites (where hBN denotes hexagonal boron nitride) were prepared by spark plasma sintering at 1973 K for 300 s under 100 MPa. The hBN content was varied from 0 to 30% of the total volume of the composite, while maintaining a TiN:TiB2 ratio of 30:70 vol%. The effects of hBN content on the densification, microstructure, mechanical properties and thermal conductivities of the composites were investigated. Regardless of hBN content, TiN-TiB2-hBN composites showed high relative densities (96-97%). At the optimal hBN content (15 vol%), the composites also showed high hardness and fracture toughness (20.1 GPa and 4.3 MPa m1/2, respectively), and their thermal conductivity increased from 58.1 to 63.4 W m-1 K-1 as the temperature was increased from 293 to 973 K. In contrast, the thermal conductivity of most ceramics decreases with increasing temperature.

Original languageEnglish
Pages (from-to)4498-4503
Number of pages6
JournalCeramics International
Volume41
Issue number3
DOIs
Publication statusPublished - 2015 Apr 1

Keywords

  • Hexagonal boronnitride
  • Spark plasma sintering
  • Titanium diboride
  • Titanium nitride

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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