Sintering of TiB2-W cermets by HIP and their properties

Dong Gil Ahn, Yong Ho Park, Akira Kawasaki, Ryuzo Watanabe

Research output: Contribution to journalArticlepeer-review

Abstract

The purpose of this study is to investigate the formation of a new phase in TiB2-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 yielded the cermets with a relative density of more than 99% . Analysis of these semples by XRD, EPMA and Auger, showed the presence of TiB2, β-WB and WTiB2, however no metallic W was detected between 5 and 30vol%W. The Vickers hardness, fracture toughness and Young's modulus increased with the formation of the WTiB2 phase, and its volume fraction increased at W-rich compositions. The highest fracture toughness of 7.8MPam1/2 and Young's modulus of 571GPa, were obtained for the TiB2-25vol%W composition. The Vickers hardness value of all specimens was above 20GPa. The fracture toughness values of the higher W compositions were greater than those of the lower W compositions.

Original languageEnglish
Pages (from-to)515-519
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume43
Issue number4
DOIs
Publication statusPublished - 1996 Apr

Keywords

  • Cermet
  • HIP-sintering
  • Mechanical property
  • Microstructure
  • TiB2-w

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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