Densification and mechanical properties of cBN-TiN-TiB2 composites prepared by spark plasma sintering of SiO2-coated cBN powder

Mettaya Kitiwan, Akihiko Ito, Jianfeng Zhang, Takashi Goto

Research output: Contribution to journal › Article

19 Citations (Scopus)

Abstract

cBN-TiN-TiB2 composites were fabricated by spark plasma sintering at 1773-1973K using cubic boron nitride (cBN) and SiO2-coated cBN (cBN(SiO2)) powders. The effect of SiO2 coating, cBN content and sintering temperature on the phase composition, densification and mechanical properties of the composites was investigated. SiO2 coating on cBN powder retarded the phase transformation of cBN in the composites up to 1873K and facilitated viscous sintering that promoted the densification of the composites. Sintering at 1873K, without the SiO2 coating, caused the relative density and Vickers hardness of the composite to linearly decrease from 96.2% to 79.8% and from 25.3 to 4.4GPa, respectively, whereas the cBN(SiO2)-TiN-TiB2 composites maintained high relative density (91.0-96.2%) and Vickers hardness (17.9-21.0GPa) up to 50vol% cBN. The cBN(SiO2)-TiN-TiB2 composites had high thermal conductivity (60Wm-1K-1 at room temperature) comparable to the TiN-TiB2 binary composite.

Original languageEnglish
Pages (from-to)3619-3626
Number of pages8
JournalJournal of the European Ceramic Society
Volume34
Issue number15
DOIs
Publication statusPublished - 2014 Dec

Keywords

  • Cubic boron nitride
  • Spark plasma sintering
  • Titanium diboride
  • Titanium nitride

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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