Spark plasma sintering and mechanical properties of tantalum carbonitrides Ta2CxNy

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS Open Ceramics Pub Date : 2024-04-24 DOI:10.1016/j.oceram.2024.100598

Jérémie Manaud , Arata Nakajo , Enrico Corniani , Michael Holzhäuser , Andrea Cambriani , Marco Cologna , Peter Hähner , Luka Vlahovic , Rudy Konings

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Abstract

Dense tantalum-based carbonitride materials featuring >95 % relative density, TaC, Ta₂C_1.5N_0.5, Ta₂CN, Ta₂C_0.5N_1.5 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. 600–700 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 an approximately linear trend for the carbonitride samples while the ratio of plastic deformation work over the total indentation work followed the opposite trend.

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钽碳氮化物 Ta2CxNy 的火花等离子烧结和机械性能

通过火花等离子烧结（SPS）技术，在 1873 K、停留时间 10 分钟、压力 50 兆帕的条件下制备了相对密度为 95% 的致密钽基碳化物材料，包括 TaC、Ta2C1.5N0.5、Ta2CN、Ta2C0.5N1.5 和 TaN。尽管存在氧化物相（即 5 Vol%）和一些 W 杂质（即 1 Vol%），这种超高温陶瓷（UHTC）的机械性能仍显示出良好的数值。事实上，通过纳米压痕法测得的杨氏模量约为 600-700 GPa，高于类似超高温陶瓷的文献报道值。硬度值从 TaC 的 16.4 ± 0.8 GPa 增至 TaN 的 27.9 ± 1.3 GPa，碳氮化物样品的硬度值呈近似线性趋势，而塑性变形功与总压痕功的比率则呈相反趋势。

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