1. High-pressure synthesis of TaN compacts with high hardness and thermal stability.
- Author
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Feng, Leihao, Hu, Qiwei, Lei, Li, Qi, Lei, Zhang, Leilei, Pu, Meifang, kou, Zili, Peng, Fang, He, Duanwei, Kojima, Yohei, Ohfuji, Hiroaki, and Irifune, Tetsuo
- Subjects
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THERMAL stability , *HARDNESS , *ULTRA-high-temperature ceramics , *VICKERS hardness , *HIGH temperatures - Abstract
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 ZrB 2 and HfB 2 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. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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