材料科学
纳米复合材料
放电等离子烧结
陶瓷
微观结构
碳化物
烧结
陶瓷基复合材料
复合材料
化学工程
工程类
作者
Lu Li,T. C. Wen,Wei Li,Qingbo Wen,Zhaoju Yu,Shasha Tao,Jincan Yang,Yalei Wang,Xingang Luan,Xiang Xiong,Ralf Riedel
标识
DOI:10.1016/j.jeurceramsoc.2023.09.074
摘要
A dense monolithic SiC/(Ti0.25Zr0.25Hf0.25Ta0.25)C ceramic nanocomposite containing high-entropy carbide phase was prepared using a single-source-precursor method combined with spark plasma sintering. The nanocomposites were characterized by a unique microstructure with a homogeneous dispersion of (Ti0.25Zr0.25Hf0.25Ta0.25)C@C core-shell nanoparticles within a β-SiC matrix. The atomic ratios of transition metal elements within the in situ generated (Ti0.25Zr0.25Hf0.25Ta0.25)C nanoparticles can be controlled precisely by molecular design of the preceramic precursors. Oxidation behavior of the SiC/(Ti0.25Zr0.25Hf0.25Ta0.25)C nanocomposite was investigated as well. The SiC/(Ti0.25Zr0.25Hf0.25Ta0.25)C exhibit excellent oxidation resistance between 1200 °C and 1500 °C due to the in situ generated continuous multiphase scales consisting of β-SiO2, HfTiO4, ZrSiO4, HfSiO4, and Ta2O5 that can be rapidly sintered during oxidation. Particularly, at 1200 °C, the parabolic oxidation rate constant (Kp) value is 1~2 orders of magnitude lower than that of similar SiC/HfC, SiC/(Hf, Ta)C, SiC/(Hf, Ti)C and SiC/(Hf, Zr, Ti)C nanocomposites.
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