Spark plasma sintering and mechanical properties of tantalum carbonitrides Ta2CxNy.

Dense tantalum-based carbonitride materials featuring > 95% relative density, TaC, Ta2C1.5N0.5, Ta2CN, Ta2C0.5N1.5 and TaN, were prepared by Spark Plasma Sintering (SPS) at 1873 K with a dwell time of 10 min and a pressure of 50 MPa. Despite the presence of an oxide phase (i.e. 5 vol.%) and some W inclusions (i.e. 1 vol.%), the mechanical properties of such ultra-high temperature ceramics (UHTC) show promising values. Indeed, the Young’s moduli measured by nano-indentation were approx. 600 to 700 GPa, which is higher than literature values reported for similar UHTC. The hardness values increased from 16.4 ± 0.8 GPa for TaC to 27.9 ± 1.3 GPa for TaN, with a quasi-linear trend for the carbonitride samples while the ratio of plastic deformation work over the total indentation work followed the opposite trend.

MANAUD Jeremie;  NAKAJO Arata;  CORNIANI Enrico;  HOLZHAEUSER Michael;  CAMBRIANI Andrea;  COLOGNA Marco;  HAEHNER Peter;  VLAHOVIC Luka;  KONINGS Rudy; 

2024-04-29

Elsevier BV

JRC136388

2666-5395 (online),   

https://www.sciencedirect.com/science/article/pii/S2666539524000622?via%3Dihub,    https://publications.jrc.ec.europa.eu/repository/handle/JRC136388,   

10.1016/j.oceram.2024.100598 (online),