Microstructure and mechanical properties of TiBz-W cermets prepared by HIP

Dong Gil Ahn, Akira Kawasaki, Ryuzo Watanabe

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Titanium diboride (TiB2) based cermets have recently been studied for their potential applications to cutting tools and wear resistant materials because of their superior thermomechanical properties under various conditions. The purpose of this study is to investigate the formation of a new phase in TiBz-W cermets during HIP sintering and to evaluate the influence of this new phase on the mechanical properties. Green compacts of TiB2-W with compositions between 5 and 40vol%W were densified by HIP at a pressure of 200MPa and temperatures above 2023K, which formed cermets with relative density of more than 99%. Analysis of these samples by XRD, EPMA and Auger spectra, showed the presence of TiB2, β-WB and WTiB2, however no metallic tungsten was detected between 5 and 30vol%W. The Vickers hardness, fracture toughness and Young's modulus increased with the formation of the WTiBz phase, and its volume fraction was found to increase at W-rich compositions. The highest fracture toughness of 7.8MParnw and Young's modulus of 571GPa, were obtained for the TiBz-25vol%W composition. The Vickers hardness value was above 20GPa, and the fracture toughness values of the W-rich compositions were greater than those of the W-poor compositions.

Original languageEnglish
Pages (from-to)1078-1083
Number of pages6
JournalMaterials Transactions, JIM
Volume37
Issue number5
DOIs
Publication statusPublished - 1996

Keywords

  • Cermet
  • Densiflcation
  • Fracture toughness
  • HIP
  • Mechanical property
  • Microstructure
  • Ternary diboride compound
  • Thermal expansion coefficient
  • Titanium diboride
  • Tungsten
  • Vickers hardness

ASJC Scopus subject areas

  • Engineering(all)

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