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

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 te...

Full description

Saved in:
Bibliographic Details
Published in:Ceramics international 2021-11, Vol.47 (21), p.30039-30042
Main Authors: Feng, Leihao, Hu, Qiwei, Lei, Li, Qi, Lei, Zhang, Leilei, Pu, Meifang, kou, Zili, Peng, Fang, He, Duanwei, Kojima, Yohei, Ohfuji, Hiroaki, Irifune, Tetsuo
Format: Article
Language:English
Subjects:
High hardness
High temperature and high pressure
Tantalum nitride
Thermal stability
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2021.07.179