High-pressure synthesis of TaN compacts with high hardness and thermal stability

Leihao Feng, Qiwei Hu, Li Lei, Lei Qi, Leilei Zhang, Meifang Pu, Zili kou, Fang Peng, Duanwei He, Yohei Kojima, Hiroaki Ohfuji, Tetsuo Irifune

Research output: Contribution to journalArticlepeer-review


High-hardness TaN compacts with a diameter and height of 6 mm were synthesized through the phase transformation of CoSn-type into WC-type TaN under experimental conditions of high temperature and high pressure. The Vickers hardness of WC-type TaN compacts obtained at the pressure of 5 GPa and the temperature of 1873 K is found to be ~21.5 ± 1.5 GPa with a load of 3 Kg, which is comparable to that of the pure tungsten carbide compact (~20 GPa) and higher than those of ultrahigh temperature ceramics ZrB2 and HfB2 under the same load. The high hardness of WC-type TaN compacts presented in this work is attributed to the deviatoric strain and well-bonded nanograins. The synthesized WC-type TaN compacts also possess a high oxidation temperature (1072 K). These results suggest that the WC-type TaN with high hardness and high thermal stability holds great promise for industrial applications.

Original languageEnglish
Pages (from-to)30039-30042
Number of pages4
JournalCeramics International
Issue number21
Publication statusPublished - 2021 Nov 1
Externally publishedYes


  • High hardness
  • High temperature and high pressure
  • Tantalum nitride
  • Thermal stability

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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